diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 060e48a5..07fec1b3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -9,7 +9,7 @@ on:
 
 jobs:
   ci:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     container:
       image: exercism/tcl-test-runner:latest
 
diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 74bf1ccc..737b152d 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -6,7 +6,7 @@ on: pull_request
 
 jobs:
   ci:
-    runs-on: ubuntu-24.04
+    runs-on: ubuntu-26.04
     container:
       image: exercism/tcl-test-runner:latest