diff --git a/spring-boot-project/spring-boot-dependencies/build.gradle b/spring-boot-project/spring-boot-dependencies/build.gradle
index 1e325ea684a8..e3a0221c3d94 100644
--- a/spring-boot-project/spring-boot-dependencies/build.gradle
+++ b/spring-boot-project/spring-boot-dependencies/build.gradle
@@ -1121,7 +1121,7 @@ bom {
 			releaseNotes("https://github.com/apache/logging-log4j2/releases/tag/rel%2F{version}")
 		}
 	}
-	library("Logback", "1.5.6") {
+	library("Logback", "1.5.7") {
 		group("ch.qos.logback") {
 			modules = [
 				"logback-classic",
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java
index abba6c24c41d..6712419f81a5 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/DefaultLogbackConfiguration.java
@@ -17,6 +17,7 @@
 package org.springframework.boot.logging.logback;
 
 import java.nio.charset.Charset;
+import java.util.concurrent.locks.ReentrantLock;
 
 import ch.qos.logback.classic.Level;
 import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
@@ -44,6 +45,7 @@
  * @author Robert Thornton
  * @author Scott Frederick
  * @author Jonatan Ivanov
+ * @author Mark Chesney
  */
 class DefaultLogbackConfiguration {
 
@@ -54,7 +56,9 @@ class DefaultLogbackConfiguration {
 	}
 
 	void apply(LogbackConfigurator config) {
-		synchronized (config.getConfigurationLock()) {
+		ReentrantLock lock = config.getConfigurationLock();
+		lock.lock();
+		try {
 			defaults(config);
 			Appender<ILoggingEvent> consoleAppender = consoleAppender(config);
 			if (this.logFile != null) {
@@ -65,6 +69,9 @@ void apply(LogbackConfigurator config) {
 				config.root(Level.INFO, consoleAppender);
 			}
 		}
+		finally {
+			lock.unlock();
+		}
 	}
 
 	private void defaults(LogbackConfigurator config) {
diff --git a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackConfigurator.java b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackConfigurator.java
index b57e5d80dbf9..e557c1724c96 100644
--- a/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackConfigurator.java
+++ b/spring-boot-project/spring-boot/src/main/java/org/springframework/boot/logging/logback/LogbackConfigurator.java
@@ -18,6 +18,7 @@
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.concurrent.locks.ReentrantLock;
 
 import ch.qos.logback.classic.Level;
 import ch.qos.logback.classic.Logger;
@@ -35,6 +36,7 @@
  * Allows programmatic configuration of logback which is usually faster than parsing XML.
  *
  * @author Phillip Webb
+ * @author Mark Chesney
  */
 class LogbackConfigurator {
 
@@ -49,7 +51,7 @@ LoggerContext getContext() {
 		return this.context;
 	}
 
-	Object getConfigurationLock() {
+	ReentrantLock getConfigurationLock() {
 		return this.context.getConfigurationLock();
 	}
 
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemParallelInitializationTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemParallelInitializationTests.java
index 4624be2a5097..f8a6bda4c756 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemParallelInitializationTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemParallelInitializationTests.java
@@ -36,6 +36,7 @@
  * control over how and when the logging system is initialized.
  *
  * @author Andy Wilkinson
+ * @author Mark Chesney
  */
 class LogbackLoggingSystemParallelInitializationTests {
 
@@ -45,6 +46,7 @@ class LogbackLoggingSystemParallelInitializationTests {
 	void cleanUp() {
 		this.loggingSystem.cleanUp();
 		((LoggerContext) LoggerFactory.getILoggerFactory()).stop();
+		((LoggerContext) LoggerFactory.getILoggerFactory()).reset();
 	}
 
 	@Test
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java
index 995c25f8804b..b3e4af667a35 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/LogbackLoggingSystemTests.java
@@ -44,6 +44,7 @@
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.junit.jupiter.MockitoExtension;
 import org.slf4j.ILoggerFactory;
 import org.slf4j.LoggerFactory;
 import org.slf4j.MDC;
@@ -93,8 +94,9 @@
  * @author Scott Frederick
  * @author Jonatan Ivanov
  * @author Moritz Halbritter
+ * @author Mark Chesney
  */
-@ExtendWith(OutputCaptureExtension.class)
+@ExtendWith({ MockitoExtension.class, OutputCaptureExtension.class })
 @ClassPathExclusions({ "log4j-core-*.jar", "log4j-api-*.jar" })
 class LogbackLoggingSystemTests extends AbstractLoggingSystemTests {
 
@@ -128,6 +130,7 @@ void cleanUp() {
 		System.getProperties().keySet().retainAll(this.systemPropertyNames);
 		this.loggingSystem.cleanUp();
 		((LoggerContext) LoggerFactory.getILoggerFactory()).stop();
+		((LoggerContext) LoggerFactory.getILoggerFactory()).reset();
 	}
 
 	@Test
diff --git a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/SpringBootJoranConfiguratorTests.java b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/SpringBootJoranConfiguratorTests.java
index beab88321a33..d680800ab4c8 100644
--- a/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/SpringBootJoranConfiguratorTests.java
+++ b/spring-boot-project/spring-boot/src/test/java/org/springframework/boot/logging/logback/SpringBootJoranConfiguratorTests.java
@@ -43,6 +43,7 @@
  * @author Phillip Webb
  * @author Eddú Meléndez
  * @author Stephane Nicoll
+ * @author Mark Chesney
  */
 @ExtendWith(OutputCaptureExtension.class)
 class SpringBootJoranConfiguratorTests {
@@ -72,6 +73,7 @@ void setup(CapturedOutput output) {
 	@AfterEach
 	void reset() {
 		this.context.stop();
+		this.context.reset();
 		new BasicConfigurator().configure((LoggerContext) LoggerFactory.getILoggerFactory());
 	}