diff --git a/.github/workflows/android.yml b/.github/workflows/android.yml
index bfc73a9a788..8ff5496c5c7 100644
--- a/.github/workflows/android.yml
+++ b/.github/workflows/android.yml
@@ -43,7 +43,7 @@ jobs:
         -DNCNN_VULKAN=ON \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -110,7 +110,7 @@ jobs:
         -DNCNN_VULKAN=ON \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/code-format.yml b/.github/workflows/code-format.yml
index f4fe92c5b07..50e1a05c36c 100644
--- a/.github/workflows/code-format.yml
+++ b/.github/workflows/code-format.yml
@@ -20,7 +20,7 @@ jobs:
         apt-get update -y
         apt-get install -y astyle git
 
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: cache-clang-format
       id: cache-clang-format
diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index 9725e432e5d..22e9683a0bf 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -43,7 +43,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         # We must fetch at least the immediate parents so that if this is
         # a pull request then we can checkout the head.
diff --git a/.github/workflows/compare-binary-size.yml b/.github/workflows/compare-binary-size.yml
index de8b115fa8a..c6e41eb03d7 100644
--- a/.github/workflows/compare-binary-size.yml
+++ b/.github/workflows/compare-binary-size.yml
@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: checkout-pr-branch
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: ${{ github.event.pull_request.head.ref }}
         repository: ${{ github.event.pull_request.head.repo.full_name }}
@@ -21,7 +21,7 @@ jobs:
         path: pr
 
     - name: checkout-base-branch
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         ref: ${{ github.event.pull_request.base.ref }}
         repository: ${{ github.event.pull_request.base.repo.full_name }}
diff --git a/.github/workflows/elf-riscv32.yml b/.github/workflows/elf-riscv32.yml
index e26f367d0e8..a0b44a78cb7 100644
--- a/.github/workflows/elf-riscv32.yml
+++ b/.github/workflows/elf-riscv32.yml
@@ -32,7 +32,7 @@ jobs:
   rv32gc:
     runs-on: [self-hosted, linux, centos]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     #- name: riscv-gnu-toolchain
       #run: |
@@ -41,7 +41,7 @@ jobs:
         #mv riscv riscv32-elf
 
     #- name: checkout-riscv-pk
-      #uses: actions/checkout@v5
+      #uses: actions/checkout@v6
       #with:
         #repository: riscv/riscv-pk
         #path: riscv-pk
@@ -58,7 +58,7 @@ jobs:
         #make install
 
     #- name: checkout-riscv-isa-sim
-      #uses: actions/checkout@v5
+      #uses: actions/checkout@v6
       #with:
         #repository: riscv-software-src/riscv-isa-sim
         #path: riscv-isa-sim
diff --git a/.github/workflows/elf-riscv64.yml b/.github/workflows/elf-riscv64.yml
index 4443e26df76..99a292ec45d 100644
--- a/.github/workflows/elf-riscv64.yml
+++ b/.github/workflows/elf-riscv64.yml
@@ -32,7 +32,7 @@ jobs:
   rv64gc:
     runs-on: [self-hosted, linux, centos]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     #- name: riscv-gnu-toolchain
       #run: |
@@ -41,7 +41,7 @@ jobs:
         #mv riscv riscv64-elf
 
     #- name: checkout-riscv-pk
-      #uses: actions/checkout@v5
+      #uses: actions/checkout@v6
       #with:
         #repository: riscv/riscv-pk
         #path: riscv-pk
@@ -58,7 +58,7 @@ jobs:
         #make install
 
     #- name: checkout-riscv-isa-sim
-      #uses: actions/checkout@v5
+      #uses: actions/checkout@v6
       #with:
         #repository: riscv-software-src/riscv-isa-sim
         #path: riscv-isa-sim
diff --git a/.github/workflows/esp32.yml b/.github/workflows/esp32.yml
index 0215094ef7c..31b4e5d1651 100644
--- a/.github/workflows/esp32.yml
+++ b/.github/workflows/esp32.yml
@@ -30,7 +30,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           submodules: true
 
@@ -45,7 +45,7 @@ jobs:
           sudo apt-get install -y cmake ninja-build ccache
             
       - name: Checkout ESP-IDF
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: espressif/esp-idf
           path: esp-idf-install
diff --git a/.github/workflows/harmonyos.yml b/.github/workflows/harmonyos.yml
index c99d0c20545..d653706e579 100644
--- a/.github/workflows/harmonyos.yml
+++ b/.github/workflows/harmonyos.yml
@@ -43,7 +43,7 @@ jobs:
         -DNCNN_VULKAN=ON \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/ios.yml b/.github/workflows/ios.yml
index 0edf6f7c7ce..81de3ccda9e 100644
--- a/.github/workflows/ios.yml
+++ b/.github/workflows/ios.yml
@@ -69,7 +69,7 @@ jobs:
         -DNCNN_VULKAN=ON \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/linux-aarch64.yml b/.github/workflows/linux-aarch64.yml
index 739faac8377..28fe148766c 100644
--- a/.github/workflows/linux-aarch64.yml
+++ b/.github/workflows/linux-aarch64.yml
@@ -32,7 +32,7 @@ jobs:
   aarch64-native:
     runs-on: ubuntu-24.04-arm
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: build
       run: |
@@ -61,7 +61,7 @@ jobs:
   asan:
     runs-on: ubuntu-24.04-arm
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       run: |
         mkdir build && cd build
@@ -75,7 +75,7 @@ jobs:
   aarch64:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: aarch64-gnu-toolchain
       run: |
diff --git a/.github/workflows/linux-arm.yml b/.github/workflows/linux-arm.yml
index 4b4281289bb..1d7546c7c71 100644
--- a/.github/workflows/linux-arm.yml
+++ b/.github/workflows/linux-arm.yml
@@ -34,7 +34,7 @@ jobs:
   arm:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: arm-gnu-toolchain
       run: |
@@ -64,7 +64,7 @@ jobs:
   armhf:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: arm-gnu-toolchain
       run: |
@@ -94,7 +94,7 @@ jobs:
   armhf-vfpv3-d16:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: arm-gnu-toolchain
       run: |
diff --git a/.github/workflows/linux-loongarch64.yml b/.github/workflows/linux-loongarch64.yml
index 88677c687a7..bd2aa284001 100644
--- a/.github/workflows/linux-loongarch64.yml
+++ b/.github/workflows/linux-loongarch64.yml
@@ -35,7 +35,7 @@ jobs:
     runs-on: [self-hosted, linux, centos]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     # - name: qemu
     #   run: |
diff --git a/.github/workflows/linux-mips.yml b/.github/workflows/linux-mips.yml
index 9a273cdf868..42864210b7d 100644
--- a/.github/workflows/linux-mips.yml
+++ b/.github/workflows/linux-mips.yml
@@ -34,7 +34,7 @@ jobs:
   mipsel:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: mipsel-gnu-toolchain
       run: |
@@ -55,7 +55,7 @@ jobs:
   mipsisa32r6el:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: mipsisa32r6el-gnu-toolchain
       run: |
diff --git a/.github/workflows/linux-mips64.yml b/.github/workflows/linux-mips64.yml
index 7a4e95178c6..f5137015ece 100644
--- a/.github/workflows/linux-mips64.yml
+++ b/.github/workflows/linux-mips64.yml
@@ -34,7 +34,7 @@ jobs:
   mips64el:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: mips64el-gnuabi64-toolchain
       run: |
@@ -55,7 +55,7 @@ jobs:
   mipsisa64r6el:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: mipsisa64r6el-gnuabi64-toolchain
       run: |
diff --git a/.github/workflows/linux-ppc64.yml b/.github/workflows/linux-ppc64.yml
index 461aab1252a..bec2fb39007 100644
--- a/.github/workflows/linux-ppc64.yml
+++ b/.github/workflows/linux-ppc64.yml
@@ -32,7 +32,7 @@ jobs:
   ppc:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: powerpc-gnu-toolchain
       run: |
@@ -53,7 +53,7 @@ jobs:
   ppc64le:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: powerpc64le-gnu-toolchain
       run: |
@@ -74,7 +74,7 @@ jobs:
   power8le-vsx:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: powerpc64le-gnu-toolchain
       run: |
@@ -95,7 +95,7 @@ jobs:
   power9le-vsx:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: powerpc64le-gnu-toolchain
       run: |
diff --git a/.github/workflows/linux-riscv32.yml b/.github/workflows/linux-riscv32.yml
index ce62011cb92..3393397ed9a 100644
--- a/.github/workflows/linux-riscv32.yml
+++ b/.github/workflows/linux-riscv32.yml
@@ -39,7 +39,7 @@ jobs:
           - { cpu: c907-rv32, QEMU_CPU: c907fdv-rv32,   OPENMP: ON,  RVV: ON,  XTHEADVECTOR: OFF, ZFH: ON, ZVFH: ON  }
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: build
       run: |
diff --git a/.github/workflows/linux-riscv64.yml b/.github/workflows/linux-riscv64.yml
index 6298dd69310..62ca3173e33 100644
--- a/.github/workflows/linux-riscv64.yml
+++ b/.github/workflows/linux-riscv64.yml
@@ -48,7 +48,7 @@ jobs:
   gcc-riscv64:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: cache-qemu
       id: cache-qemu
@@ -63,7 +63,7 @@ jobs:
         sudo apt-get install autoconf automake autotools-dev ninja-build build-essential pkg-config libglib2.0-dev libpixman-1-dev zlib1g-dev python3
     - name: checkout-qemu
       if: steps.cache-qemu.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: qemu/qemu
         path: qemu
@@ -107,7 +107,7 @@ jobs:
           - { cpu: c907, QEMU_CPU: c907fdv-rv64,   OPENMP: ON,  RVV: ON,  XTHEADVECTOR: OFF, ZFH: ON, ZVFH: ON  }
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: build
       run: |
@@ -139,7 +139,7 @@ jobs:
           - { cpu: x60, QEMU_CPU: "max,vlen=256,elen=64,vext_spec=v1.0", OPENMP: ON, RVV: ON, XTHEADVECTOR: OFF, ZFH: ON, ZVFH: ON }
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     # https://archive.spacemit.com/toolchain/spacemit-toolchain-linux-glibc-x86_64-v1.1.2.tar.xz
     - name: build-gcc
@@ -188,7 +188,7 @@ jobs:
   gcc-rvv:
     runs-on: [self-hosted, linux, ubuntu]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     #- name: cache-qemu
       #id: cache-qemu
@@ -203,7 +203,7 @@ jobs:
         #sudo apt-get install autoconf automake autotools-dev ninja-build
     #- name: checkout-qemu
       #if: steps.cache-qemu.outputs.cache-hit != 'true'
-      #uses: actions/checkout@v5
+      #uses: actions/checkout@v6
       #with:
         #repository: qemu/qemu
         #path: qemu
@@ -231,7 +231,7 @@ jobs:
 
     #- name: checkout-riscv-gnu-toolchain
       #if: steps.cache-riscv.outputs.cache-hit != 'true'
-      #uses: actions/checkout@v5
+      #uses: actions/checkout@v6
       #with:
         #repository: riscv-collab/riscv-gnu-toolchain
         #path: riscv-gnu-toolchain
@@ -277,7 +277,7 @@ jobs:
   clang-rvv:
     runs-on: [self-hosted, linux, ubuntu]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     #- name: cache-qemu
       #id: cache-qemu
@@ -292,7 +292,7 @@ jobs:
         #sudo apt-get install autoconf automake autotools-dev ninja-build
     #- name: checkout-qemu
       #if: steps.cache-qemu.outputs.cache-hit != 'true'
-      #uses: actions/checkout@v5
+      #uses: actions/checkout@v6
       #with:
         #repository: qemu/qemu
         #path: qemu
@@ -320,7 +320,7 @@ jobs:
 
     #- name: checkout-riscv-gnu-toolchain
       #if: steps.cache-riscv.outputs.cache-hit != 'true'
-      #uses: actions/checkout@v5
+      #uses: actions/checkout@v6
       #with:
         #repository: riscv-collab/riscv-gnu-toolchain
         #path: riscv-gnu-toolchain
diff --git a/.github/workflows/linux-x64-cpu-clang.yml b/.github/workflows/linux-x64-cpu-clang.yml
index cd6d2473b1a..ed094182f4d 100644
--- a/.github/workflows/linux-x64-cpu-clang.yml
+++ b/.github/workflows/linux-x64-cpu-clang.yml
@@ -38,7 +38,7 @@ jobs:
   linux-clang:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: update
       run: sudo apt-get update
     - name: protobuf
@@ -105,7 +105,7 @@ jobs:
   linux-clang-simplestl:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build-simplestl
       env:
         CC: clang
diff --git a/.github/workflows/linux-x64-cpu-gcc-musl.yml b/.github/workflows/linux-x64-cpu-gcc-musl.yml
index 9c9ef620855..dacf4d4d265 100644
--- a/.github/workflows/linux-x64-cpu-gcc-musl.yml
+++ b/.github/workflows/linux-x64-cpu-gcc-musl.yml
@@ -50,7 +50,7 @@ jobs:
           libc-dev
           linux-headers
 
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       shell: alpine.sh {0}
       run: |
diff --git a/.github/workflows/linux-x64-cpu-gcc.yml b/.github/workflows/linux-x64-cpu-gcc.yml
index c4b47f9fedf..b68eb747c32 100644
--- a/.github/workflows/linux-x64-cpu-gcc.yml
+++ b/.github/workflows/linux-x64-cpu-gcc.yml
@@ -38,7 +38,7 @@ jobs:
   linux-gcc:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: update
       run: sudo apt-get update
     - name: protobuf
@@ -87,7 +87,7 @@ jobs:
   asan:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       run: |
         mkdir build && cd build
@@ -101,7 +101,7 @@ jobs:
   linux-gcc-cpp03-nostdio-nostring-simplestl:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build-nostdio
       run: |
         mkdir build-nostdio && cd build-nostdio
@@ -132,7 +132,7 @@ jobs:
   linux-gcc-avx512:
     runs-on: [self-hosted, linux, t4]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       env:
         CC: gcc
diff --git a/.github/workflows/linux-x64-gpu-clang.yml b/.github/workflows/linux-x64-gpu-clang.yml
index 6c3f137f69d..d6da649db0d 100644
--- a/.github/workflows/linux-x64-gpu-clang.yml
+++ b/.github/workflows/linux-x64-gpu-clang.yml
@@ -38,7 +38,7 @@ jobs:
   linux-clang-gpu:
     runs-on: [self-hosted, linux, ubuntu25]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -50,7 +50,7 @@ jobs:
         key: swiftshader-linux-install-20250508
     - name: checkout-swiftshader
       if: steps.cache-swiftshader.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: google/swiftshader
         path: swiftshader
diff --git a/.github/workflows/linux-x64-gpu-gcc.yml b/.github/workflows/linux-x64-gpu-gcc.yml
index ae2be16e092..9b5b840eb55 100644
--- a/.github/workflows/linux-x64-gpu-gcc.yml
+++ b/.github/workflows/linux-x64-gpu-gcc.yml
@@ -38,7 +38,7 @@ jobs:
   linux-gcc-gpu:
     runs-on: [self-hosted, linux, ubuntu25]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -50,7 +50,7 @@ jobs:
         key: swiftshader-linux-install-20250508
     - name: checkout-swiftshader
       if: steps.cache-swiftshader.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: google/swiftshader
         path: swiftshader
@@ -85,7 +85,7 @@ jobs:
   linux-gcc-gpu-system-glslang:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: install-deps
       run: |
@@ -106,7 +106,7 @@ jobs:
   linux-gcc-gpu-t4:
     runs-on: [self-hosted, linux, t4]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: build
diff --git a/.github/workflows/linux-x64-sde.yml b/.github/workflows/linux-x64-sde.yml
index f513b505b4d..03bb26ecebe 100644
--- a/.github/workflows/linux-x64-sde.yml
+++ b/.github/workflows/linux-x64-sde.yml
@@ -36,7 +36,7 @@ jobs:
   gcc-sde:
     runs-on: ubuntu-24.04
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: update
       run: sudo apt-get update
     - name: gcc14
diff --git a/.github/workflows/linux-x86-cpu-clang.yml b/.github/workflows/linux-x86-cpu-clang.yml
index 733e067d2f2..593194a616a 100644
--- a/.github/workflows/linux-x86-cpu-clang.yml
+++ b/.github/workflows/linux-x86-cpu-clang.yml
@@ -32,7 +32,7 @@ jobs:
   linux-clang:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: update
       run: sudo apt-get update
     - name: gcc-multilib
diff --git a/.github/workflows/linux-x86-cpu-gcc.yml b/.github/workflows/linux-x86-cpu-gcc.yml
index ce113c51af6..3b6d094a241 100644
--- a/.github/workflows/linux-x86-cpu-gcc.yml
+++ b/.github/workflows/linux-x86-cpu-gcc.yml
@@ -32,7 +32,7 @@ jobs:
   linux-gcc:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: update
       run: sudo apt-get update
     - name: gcc-multilib
diff --git a/.github/workflows/mac-catalyst.yml b/.github/workflows/mac-catalyst.yml
index 09374fe1239..d57581996ad 100644
--- a/.github/workflows/mac-catalyst.yml
+++ b/.github/workflows/mac-catalyst.yml
@@ -69,7 +69,7 @@ jobs:
         -DNCNN_VULKAN=ON \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index 974c42995cc..1e324966cb2 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -77,7 +77,7 @@ jobs:
         -DNCNN_VULKAN=ON \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -140,7 +140,7 @@ jobs:
         key: swiftshader-macos-install-20251004
     - name: checkout-swiftshader
       if: steps.cache-swiftshader.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: google/swiftshader
         path: swiftshader
diff --git a/.github/workflows/pnnx.yml b/.github/workflows/pnnx.yml
index 1cce8e2d818..c12dc519445 100644
--- a/.github/workflows/pnnx.yml
+++ b/.github/workflows/pnnx.yml
@@ -40,7 +40,7 @@ jobs:
       PYTHONUSERBASE: ${{ github.workspace }}/torch
       UseMultiToolTask: true
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - uses: actions/setup-python@v6
       with:
@@ -69,7 +69,7 @@ jobs:
     runs-on: [self-hosted, linux, ubuntu25]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: local-cache-libtorch
       id: local-cache-libtorch
@@ -115,7 +115,7 @@ jobs:
 
     - name: pnnx-patches
       if: (steps.local-cache-libtorch.outputs.cache-hit != 'true' && steps.cache-libtorch.outputs.cache-hit != 'true') || (steps.local-cache-torchvision.outputs.cache-hit != 'true' && steps.cache-torchvision.outputs.cache-hit != 'true') || (steps.local-cache-onnxruntime.outputs.cache-hit != 'true' && steps.cache-onnxruntime.outputs.cache-hit != 'true')
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: pnnx/pnnx
         path: pnnx-patches
@@ -257,7 +257,7 @@ jobs:
       PYTHONUSERBASE: ${{ github.workspace }}/python-${{ matrix.python }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 359cada778e..0b2ed752f6f 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -46,7 +46,7 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -59,7 +59,7 @@ jobs:
         key: swiftshader-linux-install-20240622
     - name: checkout-swiftshader
       if: matrix.os == 'ubuntu-latest' && steps.cache-swiftshader.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: google/swiftshader
         path: swiftshader
diff --git a/.github/workflows/release-python.yml b/.github/workflows/release-python.yml
index 2e332d18345..b681307e254 100644
--- a/.github/workflows/release-python.yml
+++ b/.github/workflows/release-python.yml
@@ -18,7 +18,7 @@ jobs:
     name: Build SDist
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -82,7 +82,7 @@ jobs:
         -DLIBOMP_USE_HWLOC=OFF \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 4eba5343c89..09133ce4882 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -39,7 +39,7 @@ jobs:
     env:
       PACKAGENAME: ncnn-${{ needs.setup.outputs.VERSION }}-full-source
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: package
@@ -66,7 +66,7 @@ jobs:
     env:
       PACKAGENAME: ncnn-${{ needs.setup.outputs.VERSION }}-${{ matrix.opt.id }}
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: apt
@@ -117,7 +117,7 @@ jobs:
         key: openmp-macos-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -192,7 +192,7 @@ jobs:
         -DNCNN_VULKAN=${{ matrix.opt.vulkan }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: download-openmp-macos
@@ -302,7 +302,7 @@ jobs:
         key: openmp-ios-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -364,7 +364,7 @@ jobs:
         -DNCNN_VULKAN=${{ matrix.opt.vulkan }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: download-openmp-ios
@@ -464,7 +464,7 @@ jobs:
         key: openmp-ios-simulator-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -537,7 +537,7 @@ jobs:
         -DNCNN_VULKAN=${{ matrix.opt.vulkan }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: download-openmp-ios-simulator
@@ -653,7 +653,7 @@ jobs:
         key: openmp-mac-catalyst-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -726,7 +726,7 @@ jobs:
         -DNCNN_VULKAN=${{ matrix.opt.vulkan }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: download-openmp-mac-catalyst
@@ -842,7 +842,7 @@ jobs:
         key: openmp-watchos-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -909,7 +909,7 @@ jobs:
         -DNCNN_BUILD_BENCHMARK=OFF \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: download-openmp-watchos
       uses: actions/download-artifact@v6
       with:
@@ -991,7 +991,7 @@ jobs:
         key: openmp-watchos-simulator-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -1058,7 +1058,7 @@ jobs:
         -DNCNN_BUILD_BENCHMARK=OFF \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: download-openmp-watchos-simulator
       uses: actions/download-artifact@v6
       with:
@@ -1140,7 +1140,7 @@ jobs:
         key: openmp-tvos-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -1213,7 +1213,7 @@ jobs:
         -DNCNN_VULKAN=${{ matrix.opt.vulkan }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: download-openmp-tvos
@@ -1329,7 +1329,7 @@ jobs:
         key: openmp-tvos-simulator-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -1402,7 +1402,7 @@ jobs:
         -DNCNN_VULKAN=${{ matrix.opt.vulkan }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: download-openmp-tvos-simulator
@@ -1518,7 +1518,7 @@ jobs:
         key: openmp-visionos-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -1580,7 +1580,7 @@ jobs:
         -DNCNN_VULKAN=${{ matrix.opt.vulkan }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: download-openmp-visionos
@@ -1680,7 +1680,7 @@ jobs:
         key: openmp-visionos-simulator-release-18.1.2-20251004
     - name: checkout
       if: steps.cache-openmp.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
     - name: openmp
       if: steps.cache-openmp.outputs.cache-hit != 'true'
       run: |
@@ -1753,7 +1753,7 @@ jobs:
         -DNCNN_VULKAN=${{ matrix.opt.vulkan }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: download-openmp-visionos-simulator
@@ -1869,7 +1869,7 @@ jobs:
         -DNCNN_SHARED_LIB=${{ matrix.opt.shared-lib }} \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: ndk-fix-debug
@@ -1927,7 +1927,7 @@ jobs:
     env:
       PACKAGENAME: ncnn-${{ needs.setup.outputs.VERSION }}-webassembly
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: emsdk
       run: |
         git clone https://github.com/emscripten-core/emsdk.git
@@ -2015,7 +2015,7 @@ jobs:
         -DNCNN_SHARED_LIB=${{ matrix.opt.shared-lib }} `
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/sync-wiki.yml b/.github/workflows/sync-wiki.yml
index 6aed1e0061f..8385d373438 100644
--- a/.github/workflows/sync-wiki.yml
+++ b/.github/workflows/sync-wiki.yml
@@ -18,7 +18,7 @@ jobs:
       contents: write  # for Git to git push
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: sync
       run: |
         cp -r docs $GITHUB_WORKSPACE/ncnn.wiki
diff --git a/.github/workflows/test-coverage.yml b/.github/workflows/test-coverage.yml
index d04aecb8ab5..60572f7bb47 100644
--- a/.github/workflows/test-coverage.yml
+++ b/.github/workflows/test-coverage.yml
@@ -28,7 +28,7 @@ jobs:
   linux-gcc-gpu-t4:
     runs-on: [self-hosted, linux, t4]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: build
@@ -76,7 +76,7 @@ jobs:
           - { name: 'avx512',     SSE2: ON,  AVX: ON,  F16C: ON,  FMA: ON,  AVX2: ON,  AVX512: ON,  AVX512VNNI: OFF }
           - { name: 'avx512vnni', SSE2: ON,  AVX: ON,  F16C: ON,  FMA: ON,  AVX2: ON,  AVX512: ON,  AVX512VNNI: ON  }
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       run: |
         mkdir build && cd build
@@ -148,7 +148,7 @@ jobs:
     name: simplestl-simplemath
     runs-on: [self-hosted, linux, ubuntu25]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       run: |
         mkdir build && cd build
@@ -190,7 +190,7 @@ jobs:
           - { cpu: arl, AVX2: ON, AVXVNNI: ON,  AVXVNNIINT8: ON,  AVXNECONVERT: ON,  AVX512: OFF, AVX512VNNI: OFF, AVX512BF16: OFF, AVX512FP16: OFF }
           - { cpu: spr, AVX2: ON, AVXVNNI: OFF, AVXVNNIINT8: OFF, AVXNECONVERT: OFF, AVX512: ON,  AVX512VNNI: ON,  AVX512BF16: ON,  AVX512FP16: ON  }
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       run: |
         mkdir build && cd build
@@ -234,7 +234,7 @@ jobs:
     env:
       SDE_PATH: /data/action/osd/sde-external-9.33.0-2024-01-07-lin
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       run: |
         mkdir build && cd build
@@ -294,7 +294,7 @@ jobs:
         openmp: [ON, OFF]
     runs-on: [self-hosted, linux, ubuntu]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: build
       run: |
         export RISCV_ROOT_PATH=/data/action/osd/riscv
@@ -335,7 +335,7 @@ jobs:
   linux-gpu-llvmpipe:
     runs-on: [self-hosted, linux, ubuntu25]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: build
@@ -367,7 +367,7 @@ jobs:
   linux-gpu-swiftshader:
     runs-on: [self-hosted, linux, ubuntu25]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
@@ -379,7 +379,7 @@ jobs:
         key: swiftshader-linux-install-20250508
     - name: checkout-swiftshader
       if: steps.cache-swiftshader.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: google/swiftshader
         path: swiftshader
@@ -526,7 +526,7 @@ jobs:
             qemu-args: "-L;/usr/loongarch64-linux-gnu"
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: build
       run: |
diff --git a/.github/workflows/tvos.yml b/.github/workflows/tvos.yml
index 01338e5a221..2fb25176227 100644
--- a/.github/workflows/tvos.yml
+++ b/.github/workflows/tvos.yml
@@ -69,7 +69,7 @@ jobs:
         -DNCNN_VULKAN=ON \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/visionos.yml b/.github/workflows/visionos.yml
index ec841d54ec4..cb6a1bd2934 100644
--- a/.github/workflows/visionos.yml
+++ b/.github/workflows/visionos.yml
@@ -65,7 +65,7 @@ jobs:
         -DOpenMP_libomp_LIBRARY="libomp.a" \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: cache-openmp
       id: cache-openmp
diff --git a/.github/workflows/watchos.yml b/.github/workflows/watchos.yml
index 8d7ace636c8..aa31c2c5d0d 100644
--- a/.github/workflows/watchos.yml
+++ b/.github/workflows/watchos.yml
@@ -65,7 +65,7 @@ jobs:
         -DOpenMP_libomp_LIBRARY="libomp.a" \
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
 
     - name: cache-openmp
       id: cache-openmp
diff --git a/.github/workflows/web-assembly.yml b/.github/workflows/web-assembly.yml
index 2316506aa2b..7f9d37309b2 100644
--- a/.github/workflows/web-assembly.yml
+++ b/.github/workflows/web-assembly.yml
@@ -34,7 +34,7 @@ jobs:
   webassembly:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: emsdk
       run: |
         git clone https://github.com/emscripten-core/emsdk.git
diff --git a/.github/workflows/windows-arm.yml b/.github/workflows/windows-arm.yml
index 7e39561af3b..665100d8497 100644
--- a/.github/workflows/windows-arm.yml
+++ b/.github/workflows/windows-arm.yml
@@ -48,7 +48,7 @@ jobs:
       NCNN_CMAKE_OPTIONS: -DNCNN_BUILD_TESTS=OFF -DNCNN_BUILD_TOOLS=OFF -DNCNN_BUILD_EXAMPLES=OFF -DNCNN_VULKAN=ON
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - uses: GuillaumeFalourd/setup-windows10-sdk-action@v2.4
@@ -70,7 +70,7 @@ jobs:
     runs-on: ubuntu-latest
     container: linaro/wine-arm64
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: msvc-wine
       env:
         WINEPREFIX: /tmp/wine-x64-prefix/
@@ -103,7 +103,7 @@ jobs:
       UseMultiToolTask: true
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: build
diff --git a/.github/workflows/windows-clang.yml b/.github/workflows/windows-clang.yml
index 57db9bde58a..080a0e4ebf0 100644
--- a/.github/workflows/windows-clang.yml
+++ b/.github/workflows/windows-clang.yml
@@ -40,7 +40,7 @@ jobs:
       NCNN_CMAKE_OPTIONS: -DNCNN_BUILD_TOOLS=OFF -DNCNN_BUILD_EXAMPLES=OFF
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/windows-mingw.yml b/.github/workflows/windows-mingw.yml
index b0224820e39..fbc5fab461d 100644
--- a/.github/workflows/windows-mingw.yml
+++ b/.github/workflows/windows-mingw.yml
@@ -38,7 +38,7 @@ jobs:
       NCNN_CMAKE_OPTIONS: -DNCNN_BUILD_TOOLS=OFF -DNCNN_BUILD_EXAMPLES=OFF
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/windows-xp-clang.yml b/.github/workflows/windows-xp-clang.yml
index f0506308a73..5f7d87aca66 100644
--- a/.github/workflows/windows-xp-clang.yml
+++ b/.github/workflows/windows-xp-clang.yml
@@ -38,7 +38,7 @@ jobs:
       NCNN_CMAKE_OPTIONS: -DNCNN_BUILD_TOOLS=OFF -DNCNN_BUILD_EXAMPLES=OFF -DNCNN_BUILD_TESTS=ON
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: Set up Clang
diff --git a/.github/workflows/windows-xp-mingw.yml b/.github/workflows/windows-xp-mingw.yml
index 86f64c7ddba..2b57790eda4 100644
--- a/.github/workflows/windows-xp-mingw.yml
+++ b/.github/workflows/windows-xp-mingw.yml
@@ -38,7 +38,7 @@ jobs:
       NCNN_CMAKE_OPTIONS: -DNCNN_BUILD_TOOLS=OFF -DNCNN_BUILD_EXAMPLES=OFF -DNCNN_BUILD_TESTS=ON
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
 
diff --git a/.github/workflows/windows-xp-msvc.yml b/.github/workflows/windows-xp-msvc.yml
index d9f4c9c3634..f5436a1d5ec 100644
--- a/.github/workflows/windows-xp-msvc.yml
+++ b/.github/workflows/windows-xp-msvc.yml
@@ -39,7 +39,7 @@ jobs:
       NCNN_CMAKE_OPTIONS: -DNCNN_BUILD_TOOLS=OFF -DNCNN_BUILD_EXAMPLES=OFF -DNCNN_BUILD_TESTS=ON
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
     - name: config
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 5da18277ddf..f7824cda4da 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -57,7 +57,7 @@ jobs:
     env:
       UseMultiToolTask: true
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         submodules: true
         
@@ -111,7 +111,7 @@ jobs:
         key: swiftshader-${{ matrix.vs-version }}-x64-install-20251010
     - name: checkout-swiftshader
       if: matrix.vs-version != 'vs2015' && matrix.vs-version != 'vs2017' && steps.cache-swiftshader.outputs.cache-hit != 'true'
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         repository: google/swiftshader
         path: swiftshader