diff --git a/.chronus/changes/copilot-fix-3195-2025-8-9-14-19-15.md b/.chronus/changes/copilot-fix-3195-2025-8-9-14-19-15.md
new file mode 100644
index 00000000000..21925d4d02b
--- /dev/null
+++ b/.chronus/changes/copilot-fix-3195-2025-8-9-14-19-15.md
@@ -0,0 +1,7 @@
+---
+changeKind: internal
+packages:
+  - "@azure-tools/typespec-python"
+---
+
+upgrade pnpm version to 10.11.0
\ No newline at end of file
diff --git a/README.md b/README.md
index cc8c30d34fe..8ae03b7c7c6 100644
--- a/README.md
+++ b/README.md
@@ -3,7 +3,7 @@
 ## Requirements
 
 -   Node 20+
--   pnpm 9+
+-   pnpm 10+
 -   Python 3.9+
 
 ## Develop
diff --git a/eng/pipelines/ci-template.yml b/eng/pipelines/ci-template.yml
index cc565f49ed1..30204f0cbed 100644
--- a/eng/pipelines/ci-template.yml
+++ b/eng/pipelines/ci-template.yml
@@ -26,8 +26,8 @@ steps:
     inputs:
       versionSpec: $(PythonVersion)
 
-  - script: npm install -g pnpm@9.5.0
-    displayName: Install pnpm 9.5.0
+  - script: npm install -g pnpm@10.11.0
+    displayName: Install pnpm 10.11.0
 
   - script: npm install -g autorest
     displayName: Install autorest
diff --git a/eng/pipelines/publish-release.yml b/eng/pipelines/publish-release.yml
index f3f60666921..faa58330617 100644
--- a/eng/pipelines/publish-release.yml
+++ b/eng/pipelines/publish-release.yml
@@ -28,8 +28,8 @@ extends:
                   inputs:
                       versionSpec: 3.10
 
-                - script: npm install -g pnpm@9.5.0
-                  displayName: Install PNPM 9.5.0
+                - script: npm install -g pnpm@10.11.0
+                  displayName: Install PNPM 10.11.0
 
                 - script: pnpm install
                   displayName: Install dependencies
diff --git a/eng/pipelines/sdk_regenerate.yaml b/eng/pipelines/sdk_regenerate.yaml
index 8233ce5ea52..d78e3c08f9c 100644
--- a/eng/pipelines/sdk_regenerate.yaml
+++ b/eng/pipelines/sdk_regenerate.yaml
@@ -44,8 +44,8 @@ jobs:
     inputs:
       versionSpec: '20.x'
 
-  - script: npm install -g pnpm@9.5.0
-    displayName: Install pnpm 9.5.0
+  - script: npm install -g pnpm@10.11.0
+    displayName: Install pnpm 10.11.0
 
   - script: pnpm install
     displayName: pnpm install
diff --git a/eng/scripts/initialize.py b/eng/scripts/initialize.py
index 2a0713d8aaf..2834a594dbb 100644
--- a/eng/scripts/initialize.py
+++ b/eng/scripts/initialize.py
@@ -24,7 +24,7 @@ def copy(src: Path, dest: Path) -> None:
 
 def main(update_to_latest_typespec: bool, build_artifacts_path: Path) -> None:
     # Install global dependencies
-    call("npm install -g pnpm@9.5.0")
+    call("npm install -g pnpm@10.11.0")
     call("npm install -g autorest")
     call("npm install -g @typespec/compiler")
 
diff --git a/package.json b/package.json
index 817e4ae213f..72d95127e9c 100644
--- a/package.json
+++ b/package.json
@@ -6,7 +6,7 @@
   "workspaces": [
     "packages/*"
   ],
-  "packageManager": "pnpm@9.5.0",
+  "packageManager": "pnpm@10.11.0",
   "scripts": {
     "preinstall": "npx only-allow pnpm",
     "watch": "tsc --build ./tsconfig.ws.json --watch",
diff --git a/packages/typespec-python/scripts/eng/regenerate.ts b/packages/typespec-python/scripts/eng/regenerate.ts
index 2f52f3a1b25..5ecbf2bbcdc 100644
--- a/packages/typespec-python/scripts/eng/regenerate.ts
+++ b/packages/typespec-python/scripts/eng/regenerate.ts
@@ -494,6 +494,12 @@ async function regenerate(flags: RegenerateFlagsInput): Promise<void> {
             return () => executeCommand(tspCommand);
         });
 
+        // After upgrade to pnpm 10.x, the @typespec/http-client-python can't be installed completely with venv folder created.
+        // But the emitter will try to recreate venv again in runtime, so we shall not run in parallel until venv is
+        // installed correctly. This is just workaround solution so when we find the root cause, we can remove this line.
+        // NOTE: if we use `npm install`, emitter can be installed completely so maybe it is pnpm's bug.
+        // await tasks[0]();
+
         // Run tasks with a concurrency limit
         await runTaskPool(tasks, 30);
     }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 8c6b9200ffd..4985c1e10e9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -10065,4 +10065,6 @@ snapshots:
 
   yocto-queue@1.2.0: {}
 
+  yoctocolors-cjs@2.1.2: {}
+
   zod@3.25.7: {}