diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 44a658b464..475b02b61c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -41,7 +41,7 @@ jobs:
       matrix:
         kind: [maven, gradle]
         # Test on the latest Java version once Gradle & Maven support it.
-        jre: [17, 21, 24]
+        jre: [17, 21, 25]
         os: [ubuntu-latest, windows-latest]
         include:
           # npm on linux only (crazy slow on windows)
diff --git a/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java b/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java
index 9a56920200..4a959e42e7 100644
--- a/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java
+++ b/plugin-gradle/src/test/java/com/diffplug/gradle/spotless/GradleIntegrationHarness.java
@@ -57,8 +57,11 @@ public enum GradleVersionSupport {
 		GradleVersionSupport(String version) {
 			String minVersionForRunningJRE;
 			switch (Jvm.version()) {
+			case 26:
+				throw new UnsupportedOperationException("Needs to update the minVersionForRunningJRE, see https://docs.gradle.org/current/userguide/compatibility.html");
 			case 25:
-				// TODO: https://docs.gradle.org/current/userguide/compatibility.html
+				minVersionForRunningJRE = "9.1.0";
+				break;
 			case 24:
 				minVersionForRunningJRE = "8.14";
 				break;