diff --git a/.github/workflows/benchmark.yml b/.github/workflows/benchmark.yml
index 162848d..cb42daf 100644
--- a/.github/workflows/benchmark.yml
+++ b/.github/workflows/benchmark.yml
@@ -21,7 +21,7 @@ on:
 jobs:
   benchmarks:
     name: Run C++ benchmark
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}