diff --git a/pom.xml b/pom.xml
index fc3cb24..74dc2a3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -44,7 +44,7 @@
         <dependency>
             <groupId>org.eclipse.californium</groupId>
             <artifactId>californium-core</artifactId>
-            <version>2.2.1</version>
+            <version>2.7.3</version>
             <optional>true</optional>
         </dependency>
         <dependency>