diff --git a/chapter-4/chapter-4-spring-data-jpa/pom.xml b/chapter-4/chapter-4-spring-data-jpa/pom.xml
index 866ab2a5..72ad2445 100644
--- a/chapter-4/chapter-4-spring-data-jpa/pom.xml
+++ b/chapter-4/chapter-4-spring-data-jpa/pom.xml
@@ -15,7 +15,7 @@
 	<description>Spring Data JPA example</description>
 	<properties>
 		<java.version>11</java.version>
-		<testcontainers.version>1.20.6</testcontainers.version>
+		<testcontainers.version>1.21.0</testcontainers.version>
 	</properties>
 	<dependencyManagement>
 		<dependencies>
diff --git a/chapter-4/chapter-4-spring-data-r2dbc/pom.xml b/chapter-4/chapter-4-spring-data-r2dbc/pom.xml
index 73bf0d20..683f8405 100644
--- a/chapter-4/chapter-4-spring-data-r2dbc/pom.xml
+++ b/chapter-4/chapter-4-spring-data-r2dbc/pom.xml
@@ -15,7 +15,7 @@
 	<description>Spring Data R2DBC example</description>
 	<properties>
 		<java.version>11</java.version>
-		<testcontainers.version>1.20.6</testcontainers.version>
+		<testcontainers.version>1.21.0</testcontainers.version>
 	</properties>
 	<dependencyManagement>
 		<dependencies>
diff --git a/chapter-5/chapter-5-spring-kafka-streams/pom.xml b/chapter-5/chapter-5-spring-kafka-streams/pom.xml
index 7dccb0e6..e21120ab 100644
--- a/chapter-5/chapter-5-spring-kafka-streams/pom.xml
+++ b/chapter-5/chapter-5-spring-kafka-streams/pom.xml
@@ -15,7 +15,7 @@
 	<properties>
 		<java.version>11</java.version>
 		<spring-cloud.version>2021.0.9</spring-cloud.version>
-		<testcontainers.version>1.20.6</testcontainers.version>
+		<testcontainers.version>1.21.0</testcontainers.version>
 	</properties>
 	<dependencyManagement>
 		<dependencies>