diff --git a/README.md b/README.md
index 98f5fc2..9e31424 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,17 @@ Talks to:
  * Dolby CP750
  * Jnior 310
 
+## Prerequisites
+[purejavacomm](https://github.com/nyholku/purejavacomm) doesn't have version 1.0.4 on maven central. That version fixes compatibility with Java 11+ and is required to run in a modern JVM.
+
+Install the version 1.0.4 locally, so the dependency is picked up when building the kinoapi
+```shell
+git clone https://github.com/nyholku/purejavacomm
+cd purejavacomm
+git checkout dafb397
+mvn install
+```
+
 ## Usage
 Use Maven 3 to build.
 
diff --git a/pom.xml b/pom.xml
index efed1ac..7f0fa56 100644
--- a/pom.xml
+++ b/pom.xml
@@ -16,39 +16,39 @@
 		<dependency>
 			<groupId>org.java-websocket</groupId>
 			<artifactId>Java-WebSocket</artifactId>
-			<version>1.5.4</version>
+			<version>1.5.7</version>
 		</dependency>
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-simple</artifactId>
-			<version>1.7.36</version>
+			<version>2.0.16</version>
 		</dependency>
 		<dependency>
 			<groupId>com.google.code.gson</groupId>
 			<artifactId>gson</artifactId>
-			<version>2.10.1</version>
+			<version>2.11.0</version>
 			<scope>compile</scope>
 		</dependency>
 		<dependency>
 			<groupId>com.github.purejavacomm</groupId>
 			<artifactId>purejavacomm</artifactId>
-			<version>1.0.2.RELEASE</version>
+			<version>1.0.4</version>
 		</dependency>
 		<dependency>
 			<groupId>io.jsonwebtoken</groupId>
 			<artifactId>jjwt-api</artifactId>
-			<version>0.11.5</version>
+			<version>0.12.6</version>
 		</dependency>
 		<dependency>
 			<groupId>io.jsonwebtoken</groupId>
 			<artifactId>jjwt-impl</artifactId>
-			<version>0.11.5</version>
+			<version>0.12.6</version>
 			<scope>runtime</scope>
 		</dependency>
 		<dependency>
 			<groupId>io.jsonwebtoken</groupId>
 			<artifactId>jjwt-jackson</artifactId>
-			<version>0.11.5</version>
+			<version>0.12.6</version>
 			<scope>runtime</scope>
 		</dependency>
 		<dependency>
@@ -82,16 +82,15 @@
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.11.0</version>
+				<version>3.13.0</version>
 				<configuration>
-					<source>1.8</source>
-					<target>1.8</target>
+					<release>16</release>
 				</configuration>
 			</plugin>
 			<plugin>
 				<groupId>org.codehaus.mojo</groupId>
 				<artifactId>exec-maven-plugin</artifactId>
-				<version>3.1.0</version>
+				<version>3.5.0</version>
 				<executions>
 					<execution>
 						<goals>
diff --git a/src/main/java/de/schunterkino/kinoapi/websocket/CinemaWebSocketServer.java b/src/main/java/de/schunterkino/kinoapi/websocket/CinemaWebSocketServer.java
index d0c9eff..8030b9b 100644
--- a/src/main/java/de/schunterkino/kinoapi/websocket/CinemaWebSocketServer.java
+++ b/src/main/java/de/schunterkino/kinoapi/websocket/CinemaWebSocketServer.java
@@ -76,6 +76,7 @@
 import io.jsonwebtoken.ExpiredJwtException;
 import io.jsonwebtoken.Jwts;
 import io.jsonwebtoken.io.Decoders;
+import io.jsonwebtoken.security.Keys;
 
 /**
  * WebSocket server class which serves the documented JSON API. This class acts
@@ -208,8 +209,9 @@ private void validateToken(ClientHandshake request) throws InvalidDataException
 		// because.
 		try {
 			Jwts.parser().requireSubject("SchunterKinoRemote")
-					.setSigningKey(Decoders.BASE64.decode(App.getConfigurationString("jws_signature_key")))
-					.parseClaimsJws(compactJws);
+					.verifyWith(Keys.hmacShaKeyFor(Decoders.BASE64.decode(App.getConfigurationString("jws_signature_key"))))
+					.build()
+					.parseSignedClaims(compactJws);
 		} catch (ExpiredJwtException e) {
 			System.err.println("Expired! " + e.getMessage());
 			// e.printStackTrace();