diff --git a/.github/workflows/black.yml b/.github/workflows/black.yml
index ff16e5297..dba5b5b80 100644
--- a/.github/workflows/black.yml
+++ b/.github/workflows/black.yml
@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   lint:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - uses: psf/black@stable
diff --git a/.github/workflows/build-pypi.yml b/.github/workflows/build-pypi.yml
index 073bcda3b..f21898971 100644
--- a/.github/workflows/build-pypi.yml
+++ b/.github/workflows/build-pypi.yml
@@ -15,7 +15,7 @@ on:
 jobs:
 
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ["3.7"]
diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
index 72bba07aa..078af2abf 100644
--- a/.github/workflows/codeql.yml
+++ b/.github/workflows/codeql.yml
@@ -23,7 +23,7 @@ on:
 jobs:
   analyze:
     name: Analyze
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     permissions:
       actions: read
       contents: read
diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index acb5f1afa..b1a9dd31b 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -3,7 +3,7 @@ on: [push, pull_request]
 jobs:
 
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ["3.7"]