diff --git a/.github/workflows/R-CMD-check.yaml b/.github/workflows/R-CMD-check.yaml
index b13ac60..41b0577 100644
--- a/.github/workflows/R-CMD-check.yaml
+++ b/.github/workflows/R-CMD-check.yaml
@@ -22,7 +22,7 @@ jobs:
         config:
           - {os: macos-latest,   r: 'release'}
           - {os: windows-latest, r: 'release'}
-          - {os: ubuntu-latest,   r: 'release'}
+          - {os: ubuntu-22.04,   r: 'release'}
 
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/test-coverage.yaml b/.github/workflows/test-coverage.yaml
index 232f4ba..f4b5377 100644
--- a/.github/workflows/test-coverage.yaml
+++ b/.github/workflows/test-coverage.yaml
@@ -11,7 +11,7 @@ name: test-coverage
 
 jobs:
   test-coverage:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     env:
       GITHUB_PAT: ${{ secrets.GITHUB_TOKEN }}