TEPHRA-316 Fix missing executable permission because of MASSEMBLY-941
diff --git a/pom.xml b/pom.xml
index 15cd7b9..e451ad2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -230,6 +230,9 @@
     <!-- end twill -->
 
     <dropwizard.metrics.version>3.1.0</dropwizard.metrics.version>
+
+    <!-- Plugin versions -->
+    <maven-assembly-plugin-version>3.1.1</maven-assembly-plugin-version>
   </properties>
 
   <dependencyManagement>
@@ -533,6 +536,13 @@
           <artifactId>checksum-maven-plugin</artifactId>
           <version>1.3</version>
         </plugin>
+
+        <!-- Assembly plugin -->
+        <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-assembly-plugin</artifactId>
+          <version>${maven-assembly-plugin-version}</version>
+        </plugin>
       </plugins>
     </pluginManagement>