diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f06bbd2ee..14e0b7240 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -8,15 +8,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        smalltalk: [ Pharo64-11, Pharo64-10, Pharo64-9.0, Pharo64-8.0, GemStone64-3.7.1, GemStone64-3.6.8, GemStone64-3.5.7 ]
+        smalltalk: [ Pharo64-11, Pharo64-10 ]
         experimental: [ false ]
         include:
           - smalltalk: Pharo64-12
             experimental: true
-          - smalltalk: Squeak64-6.0
-            experimental: true
-          - smalltalk: Squeak64-5.3
-            experimental: true
     continue-on-error: ${{ matrix.experimental }}
     name: ${{ matrix.smalltalk }}
     steps: