diff --git a/.github/workflows/pull_request.yml b/.github/workflows/pull_request.yml
index d49df4269..184d11048 100644
--- a/.github/workflows/pull_request.yml
+++ b/.github/workflows/pull_request.yml
@@ -6,7 +6,7 @@ jobs:
 
   staticAnalysis:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
 
     steps:
       - uses: actions/checkout@v1
@@ -27,7 +27,7 @@ jobs:
 
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
 
     steps:
       - uses: actions/checkout@v1
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 5fd5ff3a4..208e2b3c5 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -12,7 +12,7 @@ on:
 jobs:
   publish:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-18.04
 
     steps:
       - uses: actions/checkout@v1