diff --git a/pom.xml b/pom.xml
index cbbab2b..4ee538e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -74,6 +74,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.1</version>
 				<configuration>
 					<source>${java.version}</source>
 					<target>${java.version}</target>
@@ -95,6 +96,7 @@
 			</plugin>
 			<plugin>
 				<artifactId>maven-javadoc-plugin</artifactId>
+				<version>3.3.1</version>
 				<executions>
 					<execution>
 						<id>javadoc</id>
@@ -107,6 +109,7 @@
 			</plugin>
 			<plugin>
 				<artifactId>maven-source-plugin</artifactId>
+				<version>3.2.1</version>
 				<executions>
 					<execution>
 						<id>attach-sources</id>