Configure GPG signing plugin used during release phase
diff --git a/pom.xml b/pom.xml
index 9f8fc60..8c05193 100644
--- a/pom.xml
+++ b/pom.xml
@@ -702,6 +702,11 @@
                 </plugin>
                 <plugin>
                     <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-gpg-plugin</artifactId>
+                    <version>1.6</version>
+                </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-source-plugin</artifactId>
                     <version>3.2.1</version>
                     <dependencies>