diff --git a/README.md b/README.md
index 9b2aeb1..3a9bea0 100644
--- a/README.md
+++ b/README.md
@@ -10,5 +10,5 @@ Spring boot app using DDD, CQRS, Kafka etc
 * Spring Data JPA
 * Maven
 * Kafka
-* MySQL
+* Postgresql
 * Docker Compose
diff --git a/cqrs-sink/pom.xml b/cqrs-sink/pom.xml
index f007471..5fce86a 100644
--- a/cqrs-sink/pom.xml
+++ b/cqrs-sink/pom.xml
@@ -61,8 +61,9 @@
 		</dependency>
 
 		<dependency>
-			<groupId>mysql</groupId>
-			<artifactId>mysql-connector-java</artifactId>
+			<groupId>org.postgresql</groupId>
+			<artifactId>postgresql</artifactId>
+			<scope>runtime</scope>
 		</dependency>
 
 		<dependency>
diff --git a/cqrs-sink/src/main/resources/application.properties b/cqrs-sink/src/main/resources/application.properties
index e56a7a0..4198217 100644
--- a/cqrs-sink/src/main/resources/application.properties
+++ b/cqrs-sink/src/main/resources/application.properties
@@ -1,11 +1,11 @@
-spring.datasource.url=jdbc:mysql://mysql:3306/sinkdb?autoReconnect=true&useSSL=false
+spring.datasource.url=jdbc:postgresql://db:5432/mydb
 spring.datasource.username=myuser
 spring.datasource.password=mypwd
-spring.datasource.platform=mysql
+spring.datasource.platform=postgres
 spring.datasource.initialization-mode=always
 
 spring.jpa.hibernate.ddl-auto=none
-spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
+spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQL9Dialect
 
 spring.cloud.stream.kafka.binder.brokers=kafka:9092
 spring.cloud.stream.bindings.input.destination=events
diff --git a/cqrs-source/pom.xml b/cqrs-source/pom.xml
index 63a62ee..3b344bc 100644
--- a/cqrs-source/pom.xml
+++ b/cqrs-source/pom.xml
@@ -61,8 +61,9 @@
 		</dependency>
 
 		<dependency>
-			<groupId>mysql</groupId>
-			<artifactId>mysql-connector-java</artifactId>
+			<groupId>org.postgresql</groupId>
+			<artifactId>postgresql</artifactId>
+			<scope>runtime</scope>
 		</dependency>
 
 		<dependency>
diff --git a/cqrs-source/src/main/resources/application.properties b/cqrs-source/src/main/resources/application.properties
index a5be165..94083e1 100644
--- a/cqrs-source/src/main/resources/application.properties
+++ b/cqrs-source/src/main/resources/application.properties
@@ -1,11 +1,11 @@
-spring.datasource.url=jdbc:mysql://mysql:3306/sourcedb?autoReconnect=true&useSSL=false
+spring.datasource.url=jdbc:postgresql://db:5432/mydb
 spring.datasource.username=myuser
 spring.datasource.password=mypwd
-spring.datasource.platform=mysql
+spring.datasource.platform=postgres
 spring.datasource.initialization-mode=always
 
 spring.jpa.hibernate.ddl-auto=none
-spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
+spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQL9Dialect
 
 spring.cloud.stream.kafka.binder.brokers=kafka:9092
 spring.cloud.stream.bindings.output.destination=events
diff --git a/docker-compose.yaml b/docker-compose.yaml
index f1b9ec5..c7f445f 100644
--- a/docker-compose.yaml
+++ b/docker-compose.yaml
@@ -1,4 +1,4 @@
-version: "2"
+version: '2.2'
 
 services:
   sink:
@@ -6,7 +6,7 @@ services:
     ports:
       - 8081:8081
     links:
-      - mysql
+      - db
       - kafka
 
   source:
@@ -14,17 +14,17 @@ services:
     ports:
       - 8080:8080
     links:
-      - mysql
+      - db
       - kafka
 
-  mysql:
-      image: mysql
-      ports:
-       - 3306:3306
-      environment:
-       - MYSQL_ROOT_PASSWORD=root
-       - MYSQL_USER=myuser
-       - MYSQL_PASSWORD=mypwd
+  db:
+    image: postgres
+    ports:
+      - 5432:5432
+    environment:
+      - POSTGRES_USER=myuser
+      - POSTGRES_PASSWORD=mypwd
+      - POSTGRES_DB=mydb
 
   zookeeper:
     image: confluent/zookeeper