diff --git a/java/captcha-api/pom.xml b/java/captcha-api/pom.xml
index 745b02b..c67f285 100644
--- a/java/captcha-api/pom.xml
+++ b/java/captcha-api/pom.xml
@@ -19,7 +19,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>4.11</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
diff --git a/java/demo-web/pom.xml b/java/demo-web/pom.xml
index 2cc6aee..f00edc7 100644
--- a/java/demo-web/pom.xml
+++ b/java/demo-web/pom.xml
@@ -37,7 +37,7 @@
         <dependency>
             <groupId>junit</groupId>
             <artifactId>junit</artifactId>
-            <version>3.8.1</version>
+            <version>4.13.1</version>
             <scope>test</scope>
         </dependency>
 
diff --git a/java/pom.xml b/java/pom.xml
index bdefabb..97f73b4 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -40,7 +40,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.11</version>
+      <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
     <dependency>