diff --git a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/elastic/ElasticMetricsExportAutoConfigurationTests.java b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/elastic/ElasticMetricsExportAutoConfigurationTests.java
index 1d925411653..2bf60b0b58c 100644
--- a/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/elastic/ElasticMetricsExportAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/export/elastic/ElasticMetricsExportAutoConfigurationTests.java
@@ -96,7 +96,7 @@ class ElasticMetricsExportAutoConfigurationTests {
 		this.contextRunner.withUserConfiguration(BaseConfiguration.class)
 				.withPropertyValues("management.elastic.metrics.export.api-key-credentials:secret",
 						"management.elastic.metrics.export.user-name:alice")
-				.run((context) -> assertThat(context).hasFailed().getFailure().getRootCause()
+				.run((context) -> assertThat(context).hasFailed().getFailure().rootCause()
 						.isInstanceOf(MutuallyExclusiveConfigurationPropertiesException.class));
 	}
 
@@ -105,7 +105,7 @@ class ElasticMetricsExportAutoConfigurationTests {
 		this.contextRunner.withUserConfiguration(BaseConfiguration.class)
 				.withPropertyValues("management.elastic.metrics.export.api-key-credentials:secret",
 						"management.elastic.metrics.export.password:secret")
-				.run((context) -> assertThat(context).hasFailed().getFailure().getRootCause()
+				.run((context) -> assertThat(context).hasFailed().getFailure().rootCause()
 						.isInstanceOf(MutuallyExclusiveConfigurationPropertiesException.class));
 	}
 
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfigurationTests.java
index 7a02deae7dd..f8f9768924b 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/integration/IntegrationAutoConfigurationTests.java
@@ -433,7 +433,7 @@ class IntegrationAutoConfigurationTests {
 						"spring.integration.poller.fixed-delay=1s")
 				.run((context) -> assertThat(context).hasFailed().getFailure()
 						.hasRootCauseExactlyInstanceOf(MutuallyExclusiveConfigurationPropertiesException.class)
-						.getRootCause()
+						.rootCause()
 						.asInstanceOf(
 								InstanceOfAssertFactories.type(MutuallyExclusiveConfigurationPropertiesException.class))
 						.satisfies((ex) -> {
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/r2dbc/R2dbcAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/r2dbc/R2dbcAutoConfigurationTests.java
index 2f4f7d3093d..dfb88fa49e5 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/r2dbc/R2dbcAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/r2dbc/R2dbcAutoConfigurationTests.java
@@ -102,7 +102,7 @@ class R2dbcAutoConfigurationTests {
 		this.contextRunner
 				.withPropertyValues("spring.r2dbc.url:r2dbc:pool:h2:mem:///" + randomDatabaseName() + "?maxSize=12",
 						"spring.r2dbc.pool.max-size=15")
-				.run((context) -> assertThat(context).getFailure().getRootCause()
+				.run((context) -> assertThat(context).getFailure().rootCause()
 						.isInstanceOf(MultipleConnectionPoolConfigurationsException.class));
 	}
 
@@ -111,7 +111,7 @@ class R2dbcAutoConfigurationTests {
 		this.contextRunner
 				.withPropertyValues("spring.r2dbc.url:r2dbc:pool:h2:mem:///" + randomDatabaseName() + "?maxSize=12",
 						"spring.r2dbc.pool.enabled=false")
-				.run((context) -> assertThat(context).getFailure().getRootCause()
+				.run((context) -> assertThat(context).getFailure().rootCause()
 						.isInstanceOf(MultipleConnectionPoolConfigurationsException.class));
 	}
 
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/r2dbc/R2dbcAutoConfigurationWithoutConnectionPoolTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/r2dbc/R2dbcAutoConfigurationWithoutConnectionPoolTests.java
index e9ef7bf0977..5508ad03f0f 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/r2dbc/R2dbcAutoConfigurationWithoutConnectionPoolTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/r2dbc/R2dbcAutoConfigurationWithoutConnectionPoolTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 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.
@@ -63,7 +63,7 @@ class R2dbcAutoConfigurationWithoutConnectionPoolTests {
 				.withPropertyValues("spring.r2dbc.pool.enabled=true",
 						"spring.r2dbc.url:r2dbc:h2:mem:///" + randomDatabaseName()
 								+ "?options=DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE")
-				.run((context) -> assertThat(context).getFailure().getRootCause()
+				.run((context) -> assertThat(context).getFailure().rootCause()
 						.isInstanceOf(MissingR2dbcPoolDependencyException.class));
 	}
 
@@ -72,7 +72,7 @@ class R2dbcAutoConfigurationWithoutConnectionPoolTests {
 		this.contextRunner
 				.withPropertyValues("spring.r2dbc.url:r2dbc:pool:h2:mem:///" + randomDatabaseName()
 						+ "?options=DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE")
-				.run((context) -> assertThat(context).getFailure().getRootCause()
+				.run((context) -> assertThat(context).getFailure().rootCause()
 						.isInstanceOf(MissingR2dbcPoolDependencyException.class));
 	}
 
diff --git a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfigurationTests.java b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfigurationTests.java
index 24d09c8b4fb..8523a210209 100644
--- a/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfigurationTests.java
+++ b/spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfigurationTests.java
@@ -863,7 +863,7 @@ class WebMvcAutoConfigurationTests {
 		this.contextRunner
 				.withPropertyValues("spring.mvc.pathmatch.matching-strategy:path_pattern_parser",
 						"spring.mvc.pathmatch.use-suffix-pattern:true")
-				.run((context) -> assertThat(context.getStartupFailure()).getRootCause()
+				.run((context) -> assertThat(context.getStartupFailure()).rootCause()
 						.isInstanceOf(IncompatibleConfigurationException.class));
 	}
 
diff --git a/spring-boot-project/spring-boot-dependencies/build.gradle b/spring-boot-project/spring-boot-dependencies/build.gradle
index 5ee5966383a..398910245b1 100644
--- a/spring-boot-project/spring-boot-dependencies/build.gradle
+++ b/spring-boot-project/spring-boot-dependencies/build.gradle
@@ -51,7 +51,7 @@ bom {
 			]
 		}
 	}
-	library("AssertJ", "3.22.0") {
+	library("AssertJ", "3.23.1") {
 		group("org.assertj") {
 			modules = [
 				"assertj-core"
diff --git a/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-liquibase/src/test/java/smoketest/liquibase/SampleLiquibaseApplicationTests.java b/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-liquibase/src/test/java/smoketest/liquibase/SampleLiquibaseApplicationTests.java
index 14e068e3b9a..dc5ac494aba 100644
--- a/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-liquibase/src/test/java/smoketest/liquibase/SampleLiquibaseApplicationTests.java
+++ b/spring-boot-tests/spring-boot-smoke-tests/spring-boot-smoke-test-liquibase/src/test/java/smoketest/liquibase/SampleLiquibaseApplicationTests.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2021 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.