diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 89e4097b0..46bc0ae13 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -26,7 +26,7 @@ jobs:
           git-secrets --scan
 
   formatting:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - name: Install Uncrustify
diff --git a/.github/workflows/kernel-unit-tests.yml b/.github/workflows/kernel-unit-tests.yml
index 0fdf004a6..2d9c5a214 100644
--- a/.github/workflows/kernel-unit-tests.yml
+++ b/.github/workflows/kernel-unit-tests.yml
@@ -4,7 +4,7 @@ on: [push, pull_request]
 jobs:
   run-submodule:
     name: FreeRTOS/Source Submodule Revision
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - name: Checkout Repository
       uses: actions/checkout@v2
@@ -39,7 +39,7 @@ jobs:
         path: FreeRTOS/Test/CMock/build/coverage
   run-upstream:
     name: FreeRTOS-Kernel Main Branch
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - name: Checkout Repository
       uses: actions/checkout@v2