diff --git a/.github/workflows/ci-tests-and-coverage.yml b/.github/workflows/ci-tests-and-coverage.yml
index b9fd456b..1b82566d 100644
--- a/.github/workflows/ci-tests-and-coverage.yml
+++ b/.github/workflows/ci-tests-and-coverage.yml
@@ -49,9 +49,29 @@ jobs:
       - name: Run Maven Verify
         run: mvn -U -B -ntp verify
 
+      - name: Verify Adventure dependency alignment
+        shell: bash
+        run: |
+          mkdir -p target/ci
+          mvn -B -ntp dependency:tree \
+            '-Dincludes=net.kyori:adventure-*' \
+            | tee target/ci/adventure-dependency-tree.txt
+          if grep -E 'net\.kyori:(adventure-api|adventure-key|adventure-nbt|adventure-resource-pack|adventure-serializer-configurate4|adventure-text-logger-slf4j|adventure-text-minimessage|adventure-text-serializer-(ansi|commons|gson|gson-legacy-impl|json|json-legacy-impl|legacy|plain)):[^:]+:4\.' target/ci/adventure-dependency-tree.txt; then
+            echo "Adventure 4.x core modules remain in the resolved dependency graph." >&2
+            exit 1
+          fi
+
+      - name: Upload CI Diagnostics
+        if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: ci-diagnostics
+          if-no-files-found: warn
+          path: target/ci
+
       - name: Upload JaCoCo Report
         if: always()
         uses: actions/upload-artifact@v7
         with:
           name: jacoco-report
-          path: target/site/jacoco
+          path: target/site/jacoco
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