diff --git a/pom.xml b/pom.xml
index 5cd2d73..1295b6a 100755
--- a/pom.xml
+++ b/pom.xml
@@ -17,6 +17,8 @@
 	</licenses>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<antlr.version>4.7</antlr.version>
+		<log4j.version>2.8</log4j.version>
 	</properties>
 	<build>
 		<sourceDirectory>src/main/java</sourceDirectory>
@@ -53,6 +55,7 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-source-plugin</artifactId>
+				<version>3.0.1</version>
 				<executions>
 					<execution>
 						<id>attach-sources</id>
@@ -61,38 +64,37 @@
 						</goals>
 					</execution>
 				</executions>
-				<version>2.3</version>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.6.1</version>
 				<configuration>
 					<source>1.8</source>
 					<target>1.8</target>
 				</configuration>
-				<version>3.1</version>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-resources-plugin</artifactId>
-				<version>2.6</version>
+				<version>3.0.2</version>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-surefire-plugin</artifactId>
-				<version>2.12.4</version>
+				<version>2.19.1</version>
 				<configuration>
 					<argLine>-Xmx2048m -XX:MaxPermSize=256m -Djava.awt.headless=true</argLine>
 				</configuration>
 			</plugin>
 			<plugin>
 				<artifactId>maven-eclipse-plugin</artifactId>
-				<version>2.9</version>
+				<version>2.10</version>
 			</plugin>
 			<plugin>
 				<groupId>org.antlr</groupId>
 				<artifactId>antlr4-maven-plugin</artifactId>
-				<version>4.3</version>
+				<version>4.7</version>
 				<executions>
 					<execution>
 						<id>run antlr</id>
@@ -164,43 +166,43 @@
 		<dependency>
 			<groupId>org.antlr</groupId>
 			<artifactId>antlr4</artifactId>
-			<version>4.3</version>
+			<version>${antlr.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.antlr</groupId>
 			<artifactId>antlr4-runtime</artifactId>
-			<version>4.3</version>
+			<version>${antlr.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.antlr</groupId>
 			<artifactId>antlr4-maven-plugin</artifactId>
-			<version>4.3</version>
+			<version>${antlr.version}</version>
 		</dependency>
 		<dependency>
-			<groupId>org.apache.commons</groupId>
+			<groupId>commons-io</groupId>
 			<artifactId>commons-io</artifactId>
-			<version>1.3.2</version>
+			<version>2.5</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.commons</groupId>
 			<artifactId>commons-lang3</artifactId>
-			<version>3.4</version>
+			<version>3.5</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.logging.log4j</groupId>
 			<artifactId>log4j-core</artifactId>
-			<version>2.1</version>
+			<version>${log4j.version}</version>
 		</dependency>
 		<dependency>
 			<groupId>org.apache.logging.log4j</groupId>
 			<artifactId>log4j-api</artifactId>
-			<version>2.1</version>
+			<version>${log4j.version}</version>
 		</dependency>
 
 		<dependency>
 			<groupId>junit</groupId>
 			<artifactId>junit</artifactId>
-			<version>4.11</version>
+			<version>4.12</version>
 			<scope>test</scope>
 		</dependency>
 	</dependencies>
diff --git a/src/test/java/io/proleap/vb6/ThrowingErrorListener.java b/src/test/java/io/proleap/vb6/ThrowingErrorListener.java
index 4c8b34c..e7e1bee 100644
--- a/src/test/java/io/proleap/vb6/ThrowingErrorListener.java
+++ b/src/test/java/io/proleap/vb6/ThrowingErrorListener.java
@@ -12,7 +12,7 @@ import org.antlr.v4.runtime.BaseErrorListener;
 import org.antlr.v4.runtime.RecognitionException;
 import org.antlr.v4.runtime.Recognizer;
 import org.antlr.v4.runtime.misc.NotNull;
-import org.antlr.v4.runtime.misc.Nullable;
+import org.sonatype.inject.Nullable;
 
 public class ThrowingErrorListener extends BaseErrorListener {
 
diff --git a/src/test/java/io/proleap/vb6/util/TreeUtils.java b/src/test/java/io/proleap/vb6/util/TreeUtils.java
index 2827246..e8d26e8 100644
--- a/src/test/java/io/proleap/vb6/util/TreeUtils.java
+++ b/src/test/java/io/proleap/vb6/util/TreeUtils.java
@@ -5,10 +5,10 @@ import java.util.List;
 
 import org.antlr.v4.runtime.Parser;
 import org.antlr.v4.runtime.misc.NotNull;
-import org.antlr.v4.runtime.misc.Nullable;
 import org.antlr.v4.runtime.misc.Utils;
 import org.antlr.v4.runtime.tree.Tree;
 import org.antlr.v4.runtime.tree.Trees;
+import org.sonatype.inject.Nullable;
 
 public class TreeUtils {