diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 27701d6d5..c6bad96c5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,7 +17,7 @@ jobs:
     strategy:
       matrix:
         install: [ pip, apt ]
-#        upgrade: [ true, false ]
+        # Upgrade tests temporary disabled as Python 2 version cannot be installed on Ubuntu 20.04
         upgrade: [ false ]
         exclude:
           - install: pip