diff --git a/.github/workflows/codeql-analysis.yml b/.github/workflows/codeql-analysis.yml
index b0140666b8..7799eebd35 100644
--- a/.github/workflows/codeql-analysis.yml
+++ b/.github/workflows/codeql-analysis.yml
@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   CodeQL-Build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
 
     steps:
     - name: Checkout repository
diff --git a/.github/workflows/scanbuild_static-analysis.yml b/.github/workflows/scanbuild_static-analysis.yml
index 06d758f372..e6d70b4fb9 100644
--- a/.github/workflows/scanbuild_static-analysis.yml
+++ b/.github/workflows/scanbuild_static-analysis.yml
@@ -9,7 +9,7 @@ jobs:
 #
   scanbuild-racketcgc:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     container: pmatos/scan-build:10.0.0
 
     steps:
@@ -63,7 +63,7 @@ jobs:
 
   scanbuild-racket3m:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
     container: pmatos/scan-build:10.0.0
 
     steps: