diff --git a/.github/workflows/test-and-build.yml b/.github/workflows/test-and-build.yml
index 025440f..123afa0 100644
--- a/.github/workflows/test-and-build.yml
+++ b/.github/workflows/test-and-build.yml
@@ -6,7 +6,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Set up JDK 11
         uses: actions/setup-java@v3
         with:
@@ -18,7 +18,7 @@ jobs:
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
       - name: Upload .jar file
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v3
         with:
           name: pulsar-mqtt-gateway.jar
           path: target/pulsar-mqtt-gateway.jar
@@ -28,9 +28,9 @@ jobs:
     # Run only on develop branch
     if: github.ref == 'refs/heads/develop'
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Download .jar file
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: pulsar-mqtt-gateway.jar
           path: target
@@ -47,9 +47,9 @@ jobs:
     # Run only for tagged commits
     if: github.event_name == 'push' && contains(github.ref, 'refs/tags/')
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Download .jar file
-        uses: actions/download-artifact@v2
+        uses: actions/download-artifact@v3
         with:
           name: pulsar-mqtt-gateway.jar
           path: target
diff --git a/Dockerfile b/Dockerfile
index bde91d3..68ff827 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -3,4 +3,4 @@ FROM eclipse-temurin:11-alpine
 RUN apk add --no-cache curl
 
 ADD target/pulsar-mqtt-gateway.jar /usr/app/pulsar-mqtt-gateway.jar
-ENTRYPOINT ["java", "-jar", "/usr/app/pulsar-mqtt-gateway.jar"]
+ENTRYPOINT ["java", "-XX:InitialRAMPercentage=10.0", "-XX:MaxRAMPercentage=95.0", "-jar", "/usr/app/pulsar-mqtt-gateway.jar"]
diff --git a/README.md b/README.md
index c548fc2..db37826 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+# pulsar-mqtt-gateway [![Test and create Docker image](https://github.com/HSLdevcom/pulsar-mqtt-gateway/actions/workflows/test-and-build.yml/badge.svg)](https://github.com/HSLdevcom/pulsar-mqtt-gateway/actions/workflows/test-and-build.yml)
+
 ## Description
 
 Application for publishing Pulsar messages to MQTT. The application doesn't care about 
@@ -9,13 +11,13 @@ the data content, it only publishes the binary message as-is.
 
 This project depends on [transitdata-common](https://github.com/HSLdevcom/transitdata-common) project.
 
-Either use released versions from public maven repository or build your own and install to local maven repository:
-  - ```cd transitdata-common && mvn install```  
+Either use released versions from the public GitHub Packages repository (Maven) or build your own and install to local Maven repository:
+- `cd transitdata-common && mvn install`
 
 ### Locally
 
-- ```mvn compile```  
-- ```mvn package```  
+- `mvn compile`
+- `mvn package`  
 
 ### Docker image
 
@@ -24,22 +26,19 @@ Either use released versions from public maven repository or build your own and
 
 ## Running
 
-Requirements:
-- Pulsar Cluster
-  - By default uses localhost, override host in PULSAR_HOST if needed.
-    - Tip: f.ex if running inside Docker in OSX set `PULSAR_HOST=host.docker.internal` to connect to the parent machine
-  - You can use [this script](https://github.com/HSLdevcom/transitdata/blob/master/bin/pulsar/pulsar-up.sh) to launch it as Docker container
-- Connection to an external MQTT server. 
-  - Configure username and password via files
-    - Set filepath for username via env variable FILEPATH_USERNAME_SECRET, default is `/run/secrets/mqtt_broker_username` 
-    - Set filepath for password via env variable FILEPATH_PASSWORD_SECRET, default is `/run/secrets/mqtt_broker_password` 
-  - Mandatory: Set mqtt-topic via env variable MQTT_TOPIC
-
-
-All other configuration options are configured in the [config file](src/main/resources/environment.conf) 
-which can also be configured externally via env variable CONFIG_PATH
+### Dependencies
 
-Launch Docker container with
+* Pulsar
+* Connection to a MQTT broker
 
-```docker-compose -f compose-config-file.yml up <service-name>```   
+### Environment variables
 
+* `MQTT_HAS_AUTHENTICATION`: whether the MQTT broker uses authentication
+* `FILEPATH_USERNAME_SECRET`: path to the file containing the username, default is `/run/secrets/mqtt_broker_username`
+* `FILEPATH_PASSWORD_SECRET`: path to the file containing the password, default is `/run/secrets/mqtt_broker_password`
+* `MQTT_BROKER_HOST`: URL of the MQTT broker
+* `MQTT_TOPIC`: MQTT topic where to publish messages
+* `MQTT_MAX_INFLIGHT`: maximum amount of MQTT messages in-flight
+* `MQTT_CLIENT_ID`: MQTT client ID
+* `MQTT_RETAIN_MESSAGE`: whether to send MQTT messages with retained flag
+* `MQTT_KEEP_ALIVE_INTERVAL`: interval for MQTT keep-alive, in seconds
diff --git a/pom.xml b/pom.xml
index ff8cb19..4600ca6 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,7 +9,7 @@
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <maven.compiler.source>11</maven.compiler.source>
         <maven.compiler.target>11</maven.compiler.target>
-        <common.version>1.3.29</common.version>
+        <common.version>1.5.4</common.version>
         <paho.version>1.2.5</paho.version>
     </properties>
 
@@ -52,7 +52,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-shade-plugin</artifactId>
-                <version>3.2.1</version>
+                <version>3.4.1</version>
                 <executions>
                     <!-- Run shade goal on package phase -->
                     <execution>
@@ -96,7 +96,7 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.0</version>
+                <version>3.11.0</version>
                 <configuration>
                     <source>11</source>
                     <target>11</target>