diff --git a/spring-boot-project/spring-boot-dependencies/build.gradle b/spring-boot-project/spring-boot-dependencies/build.gradle
index a91f1351e9..12421a2cf8 100644
--- a/spring-boot-project/spring-boot-dependencies/build.gradle
+++ b/spring-boot-project/spring-boot-dependencies/build.gradle
@@ -1016,19 +1016,16 @@ bom {
 			]
 		}
 	}
-	library("OkHttp3", "3.14.9") {
-		prohibit("[4.0.0-alpha01,)") {
-			because "it requires Kotlin"
-		}
+	library("OkHttp", "4.9.3") {
 		group("com.squareup.okhttp3") {
 			modules = [
 				"logging-interceptor",
 				"mockwebserver",
 				"okcurl",
 				"okhttp",
+				"okhttp-brotli",
 				"okhttp-dnsoverhttps",
 				"okhttp-sse",
-				"okhttp-testing-support",
 				"okhttp-tls",
 				"okhttp-urlconnection"
 			]
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderTests.java
index 45ca08e663..230b9c9306 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderTests.java
@@ -24,7 +24,9 @@ import java.util.Collections;
 import java.util.Set;
 import java.util.function.Supplier;
 
+import okhttp3.OkHttpClient;
 import org.apache.http.client.config.RequestConfig;
+import org.assertj.core.api.InstanceOfAssertFactories;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.InOrder;
@@ -523,19 +525,19 @@ class RestTemplateBuilderTests {
 	}
 
 	@Test
-	void connectTimeoutCanBeConfiguredOnOkHttp3RequestFactory() {
+	void connectTimeoutCanBeConfiguredOnOkHttpRequestFactory() {
 		ClientHttpRequestFactory requestFactory = this.builder.requestFactory(OkHttp3ClientHttpRequestFactory.class)
 				.setConnectTimeout(Duration.ofMillis(1234)).build().getRequestFactory();
-		assertThat(
-				ReflectionTestUtils.getField(ReflectionTestUtils.getField(requestFactory, "client"), "connectTimeout"))
-						.isEqualTo(1234);
+		assertThat(requestFactory).extracting("client", InstanceOfAssertFactories.type(OkHttpClient.class))
+				.extracting(OkHttpClient::connectTimeoutMillis).isEqualTo(1234);
 	}
 
 	@Test
 	void readTimeoutCanBeConfiguredOnOkHttp3RequestFactory() {
 		ClientHttpRequestFactory requestFactory = this.builder.requestFactory(OkHttp3ClientHttpRequestFactory.class)
 				.setReadTimeout(Duration.ofMillis(1234)).build().getRequestFactory();
-		assertThat(requestFactory).extracting("client").extracting("readTimeout").isEqualTo(1234);
+		assertThat(requestFactory).extracting("client", InstanceOfAssertFactories.type(OkHttpClient.class))
+				.extracting(OkHttpClient::readTimeoutMillis).isEqualTo(1234);
 	}
 
 	@Test
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderTestsOkHttp3Tests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderTestsOkHttp3Tests.java
new file mode 100644
index 0000000000..24b6c20e19
--- /dev/null
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/web/client/RestTemplateBuilderTestsOkHttp3Tests.java
@@ -0,0 +1,66 @@
+/*
+ * 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.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.web.client;
+
+import java.time.Duration;
+
+import okhttp3.OkHttpClient;
+import org.assertj.core.api.InstanceOfAssertFactories;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.testsupport.classpath.ClassPathOverrides;
+import org.springframework.http.client.ClientHttpRequestFactory;
+import org.springframework.http.client.OkHttp3ClientHttpRequestFactory;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
+
+/**
+ * Tests for {@link RestTemplateBuilder} with OkHttp 3.x.
+ *
+ * @author Andy Wilkinson
+ */
+@ClassPathOverrides("com.squareup.okhttp3:okhttp:3.14.9")
+class RestTemplateBuilderTestsOkHttp3Tests {
+
+	private RestTemplateBuilder builder = new RestTemplateBuilder();
+
+	@Test
+	void connectTimeoutCanBeConfiguredOnOkHttpRequestFactory() {
+		ClientHttpRequestFactory requestFactory = this.builder.requestFactory(OkHttp3ClientHttpRequestFactory.class)
+				.setConnectTimeout(Duration.ofMillis(1234)).build().getRequestFactory();
+		assertThat(requestFactory).extracting("client", InstanceOfAssertFactories.type(OkHttpClient.class))
+				.extracting(OkHttpClient::connectTimeoutMillis).isEqualTo(1234);
+	}
+
+	@Test
+	void readTimeoutCanBeConfiguredOnOkHttpRequestFactory() {
+		ClientHttpRequestFactory requestFactory = this.builder.requestFactory(OkHttp3ClientHttpRequestFactory.class)
+				.setReadTimeout(Duration.ofMillis(1234)).build().getRequestFactory();
+		assertThat(requestFactory).extracting("client", InstanceOfAssertFactories.type(OkHttpClient.class))
+				.extracting(OkHttpClient::readTimeoutMillis).isEqualTo(1234);
+	}
+
+	@Test
+	void bufferRequestBodyCanNotBeConfiguredOnOkHttpRequestFactory() {
+		assertThatIllegalStateException()
+				.isThrownBy(() -> this.builder.requestFactory(OkHttp3ClientHttpRequestFactory.class)
+						.setBufferRequestBody(false).build().getRequestFactory())
+				.withMessageContaining(OkHttp3ClientHttpRequestFactory.class.getName());
+	}
+
+}