diff --git a/pom.xml b/pom.xml
index 1a19b45..4caac4f 100644
--- a/pom.xml
+++ b/pom.xml
@@ -31,7 +31,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.12</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
diff --git a/proxy-sdk/pom.xml b/proxy-sdk/pom.xml
index 58b4252..8629660 100644
--- a/proxy-sdk/pom.xml
+++ b/proxy-sdk/pom.xml
@@ -26,7 +26,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.11</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
diff --git a/test-client/pom.xml b/test-client/pom.xml
index 7f01a4f..62ada8b 100644
--- a/test-client/pom.xml
+++ b/test-client/pom.xml
@@ -24,7 +24,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.11</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
         <!-- https://mvnrepository.com/artifact/org.asynchttpclient/async-http-client -->
diff --git a/test-server/pom.xml b/test-server/pom.xml
index 554d020..a6c9d6f 100644
--- a/test-server/pom.xml
+++ b/test-server/pom.xml
@@ -48,7 +48,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.8.2</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
         <dependency>