diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1fe3acc..ee40aad 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -79,7 +79,7 @@ jobs:
           TOXENV: ${{ matrix.PYTHON.TOXENV }}
           CARGO_TARGET_DIR: ${{ format('{0}/src/_bcrypt/target/', github.workspace) }}
   linux:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         PYTHON: