diff --git a/pom.xml b/pom.xml
index d93875e..89165d3 100644
--- a/pom.xml
+++ b/pom.xml
@@ -84,6 +84,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-assembly-plugin</artifactId>
+						<version>2.6.0o</version>
 						<executions>
 							<execution>
 								<id>make-source-package</id>
@@ -296,6 +297,7 @@
 					<plugin>
 						<groupId>org.apache.maven.plugins</groupId>
 						<artifactId>maven-jar-plugin</artifactId>
+						<version>3.1.2</version>
 						<configuration>
 							<archive>
 								<manifestEntries>
@@ -476,6 +478,7 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-surefire-plugin</artifactId>
+					<version>3.0.0-M3</version>
 					<configuration>
 						<forkMode>always</forkMode> <!-- integration tests require it -->
 					</configuration>
@@ -552,6 +555,7 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-compiler-plugin</artifactId>
+					<version>3.8.1</version>
 					<configuration>
 						<target>${maven.compiler.target}</target>
 						<source>${maven.compiler.source}</source>