diff --git a/build.gradle.kts b/build.gradle.kts
index 0a3bb25d..64bc853d 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -12,6 +12,7 @@ allprojects {
         mavenCentral()
         maven(url = "https://packages.confluent.io/maven/")
         maven(url = "https://s01.oss.sonatype.org/content/repositories/snapshots")
+        maven(url = "https://jitpack.io")
     }
 }
 
diff --git a/gradle.properties b/gradle.properties
index 94ffaadc..3d22f973 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -2,7 +2,7 @@ version=3.5.2-SNAPSHOT
 org.gradle.caching=true
 org.gradle.parallel=true
 kafkaVersion=3.8.1
-testContainersVersion=1.20.4
+testContainersVersion=1404c44
 confluentVersion=7.8.0
 fluentKafkaVersion=3.0.0
 junitVersion=5.11.4
diff --git a/streams-bootstrap-core/build.gradle.kts b/streams-bootstrap-core/build.gradle.kts
index 31f5cd35..a6880e13 100644
--- a/streams-bootstrap-core/build.gradle.kts
+++ b/streams-bootstrap-core/build.gradle.kts
@@ -33,8 +33,16 @@ dependencies {
 
     testFixturesApi(project(":streams-bootstrap-test"))
     val testContainersVersion: String by project
-    testFixturesApi(group = "org.testcontainers", name = "junit-jupiter", version = testContainersVersion)
-    testFixturesApi(group = "org.testcontainers", name = "kafka", version = testContainersVersion)
+    testFixturesApi(
+        group = "com.github.testcontainers.testcontainers-java",
+        name = "junit-jupiter",
+        version = testContainersVersion
+    )
+    testFixturesApi(
+        group = "com.github.testcontainers.testcontainers-java",
+        name = "kafka",
+        version = testContainersVersion
+    )
     testFixturesImplementation(group = "org.assertj", name = "assertj-core", version = assertJVersion)
     testImplementation(group = "io.confluent", name = "kafka-streams-avro-serde", version = confluentVersion)
     val log4jVersion: String by project
diff --git a/streams-bootstrap-core/src/test/java/com/bakdata/kafka/util/TopicClientTest.java b/streams-bootstrap-core/src/test/java/com/bakdata/kafka/util/TopicClientTest.java
index 3f881c15..204cf39d 100644
--- a/streams-bootstrap-core/src/test/java/com/bakdata/kafka/util/TopicClientTest.java
+++ b/streams-bootstrap-core/src/test/java/com/bakdata/kafka/util/TopicClientTest.java
@@ -24,6 +24,7 @@
 
 package com.bakdata.kafka.util;
 
+import static com.bakdata.kafka.KafkaTest.KAFKA_VERSION;
 import static com.bakdata.kafka.KafkaTestClient.defaultTopicSettings;
 import static java.util.Collections.emptyMap;
 import static org.assertj.core.api.Assertions.assertThat;
@@ -40,7 +41,7 @@
 class TopicClientTest {
 
     @Container
-    private final ApacheKafkaContainerCluster kafkaCluster = new ApacheKafkaContainerCluster("3.8.0", 3, 2);
+    private final ApacheKafkaContainerCluster kafkaCluster = new ApacheKafkaContainerCluster(KAFKA_VERSION, 3, 2);
 
     private static final Duration CLIENT_TIMEOUT = Duration.ofSeconds(10L);
 
diff --git a/streams-bootstrap-core/src/testFixtures/java/com/bakdata/kafka/ApacheKafkaContainerCluster.java b/streams-bootstrap-core/src/testFixtures/java/com/bakdata/kafka/ApacheKafkaContainerCluster.java
index c4548f36..87beb8e7 100644
--- a/streams-bootstrap-core/src/testFixtures/java/com/bakdata/kafka/ApacheKafkaContainerCluster.java
+++ b/streams-bootstrap-core/src/testFixtures/java/com/bakdata/kafka/ApacheKafkaContainerCluster.java
@@ -31,6 +31,7 @@
 import java.util.Collection;
 import java.util.stream.Collectors;
 import java.util.stream.IntStream;
+import lombok.Getter;
 import org.apache.kafka.common.Uuid;
 import org.testcontainers.containers.Container;
 import org.testcontainers.containers.GenericContainer;
@@ -46,6 +47,7 @@ public class ApacheKafkaContainerCluster implements Startable {
 
     private final Network network;
 
+    @Getter
     private final Collection<KafkaContainer> brokers;
 
     public ApacheKafkaContainerCluster(final String version, final int brokersNum, final int internalTopicsRf) {
@@ -61,8 +63,7 @@ public ApacheKafkaContainerCluster(final String version, final int brokersNum, f
         this.brokersNum = brokersNum;
         this.network = Network.newNetwork();
 
-        final String controllerQuorumVoters = IntStream
-                .range(0, brokersNum)
+        final String controllerQuorumVoters = IntStream.range(0, brokersNum)
                 .mapToObj(brokerNum -> String.format("%d@broker-%d:9094", brokerNum, brokerNum))
                 .collect(Collectors.joining(","));
 
@@ -86,10 +87,6 @@ public ApacheKafkaContainerCluster(final String version, final int brokersNum, f
                 .collect(Collectors.toList());
     }
 
-    public Collection<KafkaContainer> getBrokers() {
-        return this.brokers;
-    }
-
     public String getBootstrapServers() {
         return this.brokers.stream().map(KafkaContainer::getBootstrapServers).collect(Collectors.joining(","));
     }
@@ -121,5 +118,7 @@ public void start() {
     @Override
     public void stop() {
         this.brokers.stream().parallel().forEach(GenericContainer::stop);
+
+        this.network.close();
     }
 }
diff --git a/streams-bootstrap-core/src/testFixtures/java/com/bakdata/kafka/KafkaTest.java b/streams-bootstrap-core/src/testFixtures/java/com/bakdata/kafka/KafkaTest.java
index 20a05f59..fa7eae61 100644
--- a/streams-bootstrap-core/src/testFixtures/java/com/bakdata/kafka/KafkaTest.java
+++ b/streams-bootstrap-core/src/testFixtures/java/com/bakdata/kafka/KafkaTest.java
@@ -36,13 +36,14 @@
 @Testcontainers
 public abstract class KafkaTest {
     protected static final Duration POLL_TIMEOUT = Duration.ofSeconds(10);
+    public static final String KAFKA_VERSION = "3.8.1";
     private final TestTopologyFactory testTopologyFactory = TestTopologyFactory.withSchemaRegistry();
     @Container
     private final KafkaContainer kafkaCluster = newCluster();
 
     public static KafkaContainer newCluster() {
         return new KafkaContainer(DockerImageName.parse("apache/kafka-native")
-                .withTag("3.8.1"));
+                .withTag(KAFKA_VERSION));
     }
 
     private static ConditionFactory await() {