diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 61a7044..48db3a3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,12 +8,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        smalltalk: [Pharo64-10, Squeak64-6.0]
+        smalltalk: [Pharo64-10, Pharo64-11, Pharo64-12, Squeak64-6.0]
         experimental: [false]
     continue-on-error: ${{ matrix.experimental }}
     name: ${{ matrix.smalltalk }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: hpi-swa/setup-smalltalkCI@v1
         with:
           smalltalk-image: ${{ matrix.smalltalk }}