diff --git a/build.gradle b/build.gradle
index c105da3..b80fca0 100644
--- a/build.gradle
+++ b/build.gradle
@@ -19,6 +19,8 @@ repositories {
 
 dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter:5.10.2'
+    // 2026-11-07 03:01 +03: Gradle 9 no longer adds the JUnit Platform launcher itself; without it the test task fails. Task dep-gradle9.
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 
 tasks.named('test') {
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 1af9e09..325da1a 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.9.0-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME