diff --git a/.github/workflows/knownvar_bump.yml b/.github/workflows/knownvar_bump.yml
index 5b3b877..6697b6e 100644
--- a/.github/workflows/knownvar_bump.yml
+++ b/.github/workflows/knownvar_bump.yml
@@ -9,7 +9,7 @@ on:
 jobs:
   bumpvar:
     name: "Bump known vars"
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
 
     permissions:
       contents: write