diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index dff6dced..d88d8481 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -62,10 +62,10 @@ jobs:
             smalltalk: Pharo64-10
           - os: windows-2019
             smalltalk: Pharo64-6.0
-        include:
-          - os: ubuntu-18.04
-            smalltalk: GemStone64-3.5.0
-            timeout-minutes: 30
+        # include:
+        #   - os: ubuntu-18.04
+        #     smalltalk: GemStone64-3.5.0
+        #     timeout-minutes: 30
     runs-on: ${{ matrix.os }}
     name: ${{ matrix.smalltalk }} on ${{ matrix.os }}
     steps: