diff --git a/pom.xml b/pom.xml
index 2fbac55..13c1c12 100644
--- a/pom.xml
+++ b/pom.xml
@@ -42,7 +42,7 @@
         <javax-mail.version>1.4.7</javax-mail.version>
         <subethasmtp.version>3.1.7</subethasmtp.version>
         <junit.version>4.12</junit.version>
-        <mockito-core.version>2.23.0</mockito-core.version>
+        <mockito-core.version>2.23.4</mockito-core.version>
         <simple-java-mail.version>3.1.1</simple-java-mail.version>
         <spring-framework.version>5.1.2.RELEASE</spring-framework.version>