diff --git a/pom.xml b/pom.xml
index 4cd85deaf..14daf362e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -634,7 +634,7 @@
     <plugins>
       <plugin>
         <artifactId>maven-checkstyle-plugin</artifactId>
-        <version>2.17</version>
+        <version>2.15</version>
         <configuration>
           <configLocation>${basedir}/checkstyle.xml</configLocation>
           <enableRulesSummary>false</enableRulesSummary>
@@ -659,7 +659,7 @@
       </plugin>
       <plugin>
         <artifactId>maven-pmd-plugin</artifactId>
-        <version>3.6</version>
+        <version>3.5</version>
         <configuration>
           <targetJdk>${maven.compiler.target}</targetJdk>
         </configuration>