diff --git a/pom.xml b/pom.xml
index 64ccb73..b832191 100644
--- a/pom.xml
+++ b/pom.xml
@@ -56,6 +56,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-source-plugin</artifactId>
+                <version>3.3.1</version>
                 <executions>
                     <execution>
                         <id>attach-sources</id>