diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index ffbc03a..5e90dd3 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -8,7 +8,9 @@ on: [push, pull_request]
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    # Switched from ubuntu-latest to ubuntu-20.04 as former
+    # doesn't support Python 3.6
+    runs-on: ubuntu-20.04
     strategy:
       fail-fast: false
       matrix: