remove unused mockito dependency
diff --git a/pom.xml b/pom.xml
index 56524e9..50ceb04 100644
--- a/pom.xml
+++ b/pom.xml
@@ -180,12 +180,6 @@
       <version>4.13.1</version>
       <scope>test</scope>
     </dependency>
-    <dependency>
-      <groupId>org.mockito</groupId>
-      <artifactId>mockito-core</artifactId>
-      <version>2.28.2</version>
-      <scope>test</scope>
-    </dependency>
   </dependencies>
 
   <build>