diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 54bfae84..cf38f8db 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -47,7 +47,14 @@ jobs:
             repo: TruffleSOM.git
             build: |
               export JAVA_HOME=$JAVA_HOME_17_X64
-              ant jar
+              ./som --setup mx
+              echo "PATH=$PATH:`pwd`/../mx" >> "$GITHUB_ENV"
+              ./som --setup labsjdk
+              mx sforceimport
+              rm libs/jvmci || true
+              ./som --setup labsjdk
+              mx build
+
             som: "JAVA_HOME=$JAVA_HOME_17_X64 ./som -G"
             not-up-to-date: false