diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/ReactiveSessionAutoConfigurationMongoTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/ReactiveSessionAutoConfigurationMongoTests.java
index fe221ebebd..0b8549675d 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/ReactiveSessionAutoConfigurationMongoTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/session/ReactiveSessionAutoConfigurationMongoTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2020 the original author or authors.
+ * Copyright 2012-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,18 +16,23 @@
 
 package org.springframework.boot.autoconfigure.session;
 
+import java.time.Duration;
+
 import org.junit.jupiter.api.Test;
+import org.testcontainers.containers.MongoDBContainer;
+import org.testcontainers.junit.jupiter.Container;
+import org.testcontainers.junit.jupiter.Testcontainers;
 
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
 import org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration;
-import org.springframework.boot.autoconfigure.mongo.embedded.EmbeddedMongoAutoConfiguration;
 import org.springframework.boot.test.context.FilteredClassLoader;
 import org.springframework.boot.test.context.assertj.AssertableReactiveWebApplicationContext;
 import org.springframework.boot.test.context.runner.ContextConsumer;
 import org.springframework.boot.test.context.runner.ReactiveWebApplicationContextRunner;
+import org.springframework.boot.testsupport.testcontainers.DockerImageNames;
 import org.springframework.session.data.mongo.ReactiveMongoSessionRepository;
 import org.springframework.session.data.redis.ReactiveRedisSessionRepository;
 
@@ -38,16 +43,22 @@ import static org.assertj.core.api.Assertions.assertThat;
  *
  * @author Andy Wilkinson
  */
+@Testcontainers
 class ReactiveSessionAutoConfigurationMongoTests extends AbstractSessionAutoConfigurationTests {
 
+	@Container
+	static final MongoDBContainer mongoDb = new MongoDBContainer(DockerImageNames.mongo()).withStartupAttempts(5)
+			.withStartupTimeout(Duration.ofMinutes(5));
+
 	private final ReactiveWebApplicationContextRunner contextRunner = new ReactiveWebApplicationContextRunner()
 			.withConfiguration(AutoConfigurations.of(SessionAutoConfiguration.class));
 
 	@Test
 	void defaultConfig() {
-		this.contextRunner.withPropertyValues("spring.session.store-type=mongodb")
-				.withConfiguration(AutoConfigurations.of(EmbeddedMongoAutoConfiguration.class,
-						MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+		this.contextRunner
+				.withPropertyValues("spring.session.store-type=mongodb",
+						"spring.data.mongodb.uri=" + mongoDb.getReplicaSetUrl())
+				.withConfiguration(AutoConfigurations.of(MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
 						MongoReactiveAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class))
 				.run(validateSpringSessionUsesMongo("sessions"));
 	}
@@ -55,17 +66,18 @@ class ReactiveSessionAutoConfigurationMongoTests extends AbstractSessionAutoConf
 	@Test
 	void defaultConfigWithUniqueStoreImplementation() {
 		this.contextRunner.withClassLoader(new FilteredClassLoader(ReactiveRedisSessionRepository.class))
-				.withConfiguration(AutoConfigurations.of(EmbeddedMongoAutoConfiguration.class,
-						MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+				.withPropertyValues("spring.data.mongodb.uri=" + mongoDb.getReplicaSetUrl())
+				.withConfiguration(AutoConfigurations.of(MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
 						MongoReactiveAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class))
 				.run(validateSpringSessionUsesMongo("sessions"));
 	}
 
 	@Test
 	void defaultConfigWithCustomTimeout() {
-		this.contextRunner.withPropertyValues("spring.session.store-type=mongodb", "spring.session.timeout=1m")
-				.withConfiguration(AutoConfigurations.of(EmbeddedMongoAutoConfiguration.class,
-						MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+		this.contextRunner
+				.withPropertyValues("spring.session.store-type=mongodb", "spring.session.timeout=1m",
+						"spring.data.mongodb.uri=" + mongoDb.getReplicaSetUrl())
+				.withConfiguration(AutoConfigurations.of(MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
 						MongoReactiveAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class))
 				.run((context) -> {
 					ReactiveMongoSessionRepository repository = validateSessionRepository(context,
@@ -77,10 +89,10 @@ class ReactiveSessionAutoConfigurationMongoTests extends AbstractSessionAutoConf
 	@Test
 	void mongoSessionStoreWithCustomizations() {
 		this.contextRunner
-				.withConfiguration(AutoConfigurations.of(EmbeddedMongoAutoConfiguration.class,
-						MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+				.withConfiguration(AutoConfigurations.of(MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
 						MongoReactiveAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class))
-				.withPropertyValues("spring.session.store-type=mongodb", "spring.session.mongodb.collection-name=foo")
+				.withPropertyValues("spring.session.store-type=mongodb", "spring.session.mongodb.collection-name=foo",
+						"spring.data.mongodb.uri=" + mongoDb.getReplicaSetUrl())
 				.run(validateSpringSessionUsesMongo("foo"));
 	}