diff --git a/pom.xml b/pom.xml
index 511a5a2..680947a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -174,7 +174,7 @@
       <plugin> <!-- use a new version of maven  -->
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-enforcer-plugin</artifactId>
-        <version>3.5.0</version>
+        <version>3.6.1</version>
         <executions>
           <execution>
             <id>enforce-maven</id>
@@ -259,7 +259,7 @@
           <plugin> <!-- sign jar for maven central-->
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-gpg-plugin</artifactId>
-            <version>3.2.7</version>
+            <version>3.2.8</version>
             <executions>
               <execution>
                 <id>sign-artifacts</id>