diff --git a/ocpp-v1_6-test/pom.xml b/ocpp-v1_6-test/pom.xml
index 14ab7c03..a24f76b7 100644
--- a/ocpp-v1_6-test/pom.xml
+++ b/ocpp-v1_6-test/pom.xml
@@ -77,7 +77,7 @@
 		<dependency>
 		    <groupId>ch.qos.logback</groupId>
 		    <artifactId>logback-core</artifactId>
-		    <version>1.3.16</version>
+		    <version>1.5.21</version>
             <scope>test</scope>
 		</dependency>
 		<dependency>
diff --git a/ocpp-v2-test/pom.xml b/ocpp-v2-test/pom.xml
index 89561660..740fc923 100644
--- a/ocpp-v2-test/pom.xml
+++ b/ocpp-v2-test/pom.xml
@@ -103,7 +103,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-core</artifactId>
-            <version>1.3.16</version>
+            <version>1.5.21</version>
             <scope>test</scope>
         </dependency>
         <dependency>
diff --git a/ocpp-v2_0-test/pom.xml b/ocpp-v2_0-test/pom.xml
index ab6576d2..87ee176a 100644
--- a/ocpp-v2_0-test/pom.xml
+++ b/ocpp-v2_0-test/pom.xml
@@ -78,7 +78,7 @@
         <dependency>
             <groupId>ch.qos.logback</groupId>
             <artifactId>logback-core</artifactId>
-            <version>1.3.16</version>
+            <version>1.5.21</version>
             <scope>test</scope>
         </dependency>
         <dependency>