diff --git a/pom.xml b/pom.xml
index f4389a4..77b69ec 100644
--- a/pom.xml
+++ b/pom.xml
@@ -82,13 +82,14 @@
     <maven.compiler.target>${maven.compiler.release}</maven.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <project.build.outputTimestamp>1695388591</project.build.outputTimestamp>
+    <maven.version>3.9.4</maven.version>
   </properties>
 
   <dependencies>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-plugin-api</artifactId>
-      <version>3.9.3</version>
+      <version>${maven.version}</version>
     </dependency>
     <dependency>
       <groupId>org.apache.maven.plugin-tools</groupId>
@@ -101,6 +102,11 @@
       <artifactId>google-java-format</artifactId>
       <version>1.17.0</version>
     </dependency>
+    <dependency>
+      <groupId>com.google.guava</groupId>
+      <artifactId>guava</artifactId>
+      <version>32.1.2-jre</version>
+    </dependency>
 
     <dependency>
       <groupId>io.norberg</groupId>
@@ -112,7 +118,7 @@
     <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
-      <version>4.13.1</version>
+      <version>4.13.2</version>
       <scope>test</scope>
     </dependency>
     <dependency>
@@ -124,25 +130,32 @@
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-core</artifactId>
-      <version>3.9.3</version>
+      <version>${maven.version}</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.apache.maven</groupId>
       <artifactId>maven-compat</artifactId>
-      <version>3.9.3</version>
+      <version>${maven.version}</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>com.google.truth</groupId>
       <artifactId>truth</artifactId>
-      <version>0.28</version>
+      <version>1.1.3</version>
       <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>org.mockito</groupId>
       <artifactId>mockito-core</artifactId>
-      <version>4.3.1</version>
+      <version>5.2.0</version>
+      <scope>test</scope>
+    </dependency>
+    <!-- with support for java 21. Can be removed when mockito includes it -->
+    <dependency>
+      <groupId>net.bytebuddy</groupId>
+      <artifactId>byte-buddy</artifactId>
+      <version>1.14.8</version>
       <scope>test</scope>
     </dependency>
   </dependencies>