diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4e0db222c..9d23750df 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,14 +39,11 @@ jobs:
       fail-fast: false
       matrix:
         OS: [ubuntu-latest]
-        JDK: [21]
         SCALA: [2.12.19, 2.12.20, 2.13.15, 2.13.16, 3.3.5, 3.4.3, 3.6.3]
         include:
           - OS: windows-latest
-            JDK: 21
             SCALA: 2.13.16
           - OS: macos-13
-            JDK: 21
             SCALA: 2.13.16
     steps:
     - uses: actions/checkout@v4
@@ -55,7 +52,7 @@ jobs:
         submodules: true
     - uses: coursier/setup-action@v1.3
       with:
-        jvm: ${{ matrix.JDK }}
+        jvm: 21
         apps:
     - run: ./mill -i "__[$SCALA].test"
       shell: bash