diff --git a/.github/workflows/cmake.yaml b/.github/workflows/cmake.yaml
index 33fd7c99..ee336206 100644
--- a/.github/workflows/cmake.yaml
+++ b/.github/workflows/cmake.yaml
@@ -12,7 +12,7 @@ env:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
     - name: Install dependencies
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 9b7cdf71..96c2b443 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -9,7 +9,7 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     steps:
     - name: Install dependencies