diff --git a/pom.xml b/pom.xml
index a67e275..ec9f84e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -73,7 +73,7 @@
     <java.language.level>11</java.language.level>
 
     <!-- Dependency versions. -->
-    <junit.version>4.13</junit.version>
+    <junit.version>4.13.1</junit.version>
     <hamcrest.version>2.2</hamcrest.version>
     <hamcrest.optional>2.0.0</hamcrest.optional>
     <mockito.version>3.4.6</mockito.version>