diff --git a/.github/workflows/buildJDK.yml b/.github/workflows/buildJDK.yml
index e023de2..9d7416f 100644
--- a/.github/workflows/buildJDK.yml
+++ b/.github/workflows/buildJDK.yml
@@ -40,7 +40,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        mandrel-ref: [graal/master]
+        mandrel-ref: [mandrel/24.1]
     steps:
     - uses: actions/checkout@v3
     - uses: actions/checkout@v3
@@ -146,7 +146,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [macos-latest, macos-13]
-        mandrel-ref: [graal/master]
+        mandrel-ref: [mandrel/24.1]
     steps:
       - uses: actions/checkout@v3
       - uses: actions/checkout@v3
@@ -268,7 +268,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        mandrel-ref: [graal/master]
+        mandrel-ref: [mandrel/24.1]
     steps:
     - uses: actions/checkout@v3
     - uses: actions/checkout@v3
@@ -395,7 +395,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        mandrel-ref: [graal/master]
+        mandrel-ref: [mandrel/24.1]
     steps:
     - uses: actions/checkout@v3
     - uses: actions/checkout@v3