diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 2ebc4a8d..a0fd119c 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -12,7 +12,7 @@ concurrency:
 
 jobs:
   source:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
     - uses: actions/checkout@v3
 
@@ -33,7 +33,7 @@ jobs:
         path: libs/gl-client-py/dist/gl_client-*.tar.gz
 
   linux:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix:
@@ -93,7 +93,7 @@ jobs:
         path: libs/gl-client-py/dist/
 
   macos:
-    runs-on: macos-latest
+    runs-on: macos-11
     strategy:
       fail-fast: false
       matrix:
@@ -138,7 +138,7 @@ jobs:
 
 
   windows:
-    runs-on: windows-latest
+    runs-on: windows-2019
     strategy:
       fail-fast: false
       matrix: