diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4de07d83c07..257935419c8 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -119,7 +119,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ["3.7", "3.8", "3.9", "3.10"]
-        os: [ubuntu-latest]
+        os: [ubuntu-20.04]
         include:
           - python-version: 3.8
             os: windows-latest
diff --git a/.github/workflows/structured-logging-schema-check.yml b/.github/workflows/structured-logging-schema-check.yml
index 67392b973c7..01e91bac1da 100644
--- a/.github/workflows/structured-logging-schema-check.yml
+++ b/.github/workflows/structured-logging-schema-check.yml
@@ -22,7 +22,7 @@ jobs:
   # run the performance measurements on the current or default branch
   test-schema:
     name: Test Log Schema
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     env:
       # turns warnings into errors
       RUSTFLAGS: "-D warnings"