diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index cc7620f..877c69e 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -19,7 +19,7 @@ concurrency:
 jobs:
   update-check:
     if: ${{ ! inputs.patches-b64 }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
     - uses: actions/checkout@v4
     - uses: cachix/install-nix-action@v25
@@ -31,7 +31,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macos-latest]
+        os: [ubuntu-24.04, macos-latest]
         # end-user packages to ci build for cache
         pkg: 
           [aslp, bap-aslp, bap-primus, basil,
@@ -101,7 +101,7 @@ jobs:
 
   result:
     if: ${{ always() }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [ build ]
     steps:
     - name: Aggregate matrix results
@@ -112,7 +112,7 @@ jobs:
 
   push:
     if: ${{ inputs.push }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [ result ]
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/monthly.yml b/.github/workflows/monthly.yml
index c7ffd41..f806752 100644
--- a/.github/workflows/monthly.yml
+++ b/.github/workflows/monthly.yml
@@ -11,7 +11,7 @@ env:
 
 jobs:
   flake-update:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
 
     outputs:
       patches: ${{ steps.data.outputs.b64 }}
diff --git a/.github/workflows/update.yml b/.github/workflows/update.yml
index f4ef09f..c19812c 100644
--- a/.github/workflows/update.yml
+++ b/.github/workflows/update.yml
@@ -18,7 +18,7 @@ jobs:
         pkg: [asli, bap-asli-plugin, bap-primus, basil, gtirb-semantics,
               asl-translator, alive2-aslp, alive2-regehr, aslp_web, compiler-explorer]
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
 
     steps:
     - uses: actions/checkout@v4
@@ -54,7 +54,7 @@ jobs:
 
   collate:
     if: ${{ always() }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: [ update ]
     outputs:
       patches: ${{ steps.data.outputs.b64 }}