diff --git a/captchaservice-backend/pom.xml b/captchaservice-backend/pom.xml
index 3534978d..4a10a72d 100644
--- a/captchaservice-backend/pom.xml
+++ b/captchaservice-backend/pom.xml
@@ -316,7 +316,7 @@
         <dependency>
             <groupId>commons-net</groupId>
             <artifactId>commons-net</artifactId>
-            <version>3.11.1</version>
+            <version>3.12.0</version>
         </dependency>
         <dependency>
             <groupId>com.google.guava</groupId>