diff --git a/Dockerfile b/Dockerfile
index 56163f6..49826d8 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ WORKDIR /app
 COPY --chown=gradle:gradle . /app
 RUN gradle -i --stacktrace clean build
 
-FROM eclipse-temurin:25
+FROM eclipse-temurin:21
 
 WORKDIR /opt/test-runner
 COPY bin/run.sh bin/run.sh
diff --git a/build.gradle b/build.gradle
index 7e82db0..9f0dc54 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,7 +18,7 @@ dependencies {
 
     implementation "com.google.auto.value:auto-value-annotations:$autoValueVersion"
     annotationProcessor "com.google.auto.value:auto-value:$autoValueVersion"
-    implementation 'com.google.guava:guava:33.5.0-jre'
+    implementation 'com.google.guava:guava:33.4.0-jre'
     implementation "com.fasterxml.jackson.core:jackson-core:$jacksonVersion"
     implementation "com.fasterxml.jackson.core:jackson-databind:$jacksonVersion"
     implementation "com.fasterxml.jackson.datatype:jackson-datatype-jdk8:$jacksonVersion"