diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 28450e7c..87e46534 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -30,7 +30,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         scala: [2.12.20, 2.13.15]
-        java: [temurin@8]
+        java: [temurin@11]
         spark: [2.4.8, 3.0.3, 3.1.3, 3.2.4, 3.3.4, 3.4.4, 3.5.3]
         exclude:
           - spark: 2.4.8
@@ -46,21 +46,21 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Download Java (temurin@8)
-        id: download-java-temurin-8
-        if: matrix.java == 'temurin@8'
+      - name: Download Java (temurin@11)
+        id: download-java-temurin-11
+        if: matrix.java == 'temurin@11'
         uses: typelevel/download-java@v2
         with:
           distribution: temurin
-          java-version: 8
+          java-version: 11
 
-      - name: Setup Java (temurin@8)
-        if: matrix.java == 'temurin@8'
+      - name: Setup Java (temurin@11)
+        if: matrix.java == 'temurin@11'
         uses: actions/setup-java@v4
         with:
           distribution: jdkfile
-          java-version: 8
-          jdkFile: ${{ steps.download-java-temurin-8.outputs.jdkFile }}
+          java-version: 11
+          jdkFile: ${{ steps.download-java-temurin-11.outputs.jdkFile }}
 
       - name: Cache mill
         uses: actions/cache@v4
@@ -85,7 +85,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         scala: [2.12.20]
-        java: [temurin@8]
+        java: [temurin@11]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
@@ -93,21 +93,21 @@ jobs:
         with:
           fetch-depth: 0
 
-      - name: Download Java (temurin@8)
-        id: download-java-temurin-8
-        if: matrix.java == 'temurin@8'
+      - name: Download Java (temurin@11)
+        id: download-java-temurin-11
+        if: matrix.java == 'temurin@11'
         uses: typelevel/download-java@v2
         with:
           distribution: temurin
-          java-version: 8
+          java-version: 11
 
-      - name: Setup Java (temurin@8)
-        if: matrix.java == 'temurin@8'
+      - name: Setup Java (temurin@11)
+        if: matrix.java == 'temurin@11'
         uses: actions/setup-java@v4
         with:
           distribution: jdkfile
-          java-version: 8
-          jdkFile: ${{ steps.download-java-temurin-8.outputs.jdkFile }}
+          java-version: 11
+          jdkFile: ${{ steps.download-java-temurin-11.outputs.jdkFile }}
 
       - name: Cache mill
         uses: actions/cache@v4
diff --git a/.mill-version b/.mill-version
index 34a83616..aa22d3ce 100644
--- a/.mill-version
+++ b/.mill-version
@@ -1 +1 @@
-0.12.1
+0.12.3