diff --git a/.github/workflows/examples.yml b/.github/workflows/examples.yml
index 32542b1..42d10d4 100644
--- a/.github/workflows/examples.yml
+++ b/.github/workflows/examples.yml
@@ -21,7 +21,7 @@ jobs:
 
     name: "Build with Python ${{ matrix.python-version }} and Exasol ${{ matrix.exasol-tag }}"
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     timeout-minutes: 15
 
     services:
diff --git a/.github/workflows/ssl_cert.yml b/.github/workflows/ssl_cert.yml
index 6f0bdd1..4ffa709 100644
--- a/.github/workflows/ssl_cert.yml
+++ b/.github/workflows/ssl_cert.yml
@@ -21,7 +21,7 @@ jobs:
             exasol-tag: 7.1.6
     name: "Build SSL-Cert with Python ${{ matrix.python-version }} and Exasol ${{ matrix.exasol-tag }}"
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     timeout-minutes: 15
 
     steps: