diff --git a/hsarback/pom.xml b/hsarback/pom.xml
index 0f9af1a..290d540 100644
--- a/hsarback/pom.xml
+++ b/hsarback/pom.xml
@@ -11,8 +11,8 @@
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<maven.compiler.source>11</maven.compiler.source>
-		<maven.compiler.target>11</maven.compiler.target>
+		<maven.compiler.source>8</maven.compiler.source>
+		<maven.compiler.target>8</maven.compiler.target>
 	</properties>
 	<profiles>
 		<profile>
@@ -116,8 +116,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.11.0</version>
 				<configuration>
-					<source>11</source>
-					<target>11</target>
+					<source>8</source>
+					<target>8</target>
 				</configuration>
 			</plugin>
 		</plugins>
diff --git a/qserv/pom.xml b/qserv/pom.xml
index 5a3b2a0..828e017 100644
--- a/qserv/pom.xml
+++ b/qserv/pom.xml
@@ -7,7 +7,7 @@
 	<version>4.0.15</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<java.version>11</java.version>
+		<java.version>8</java.version>
 	</properties>
 	<dependencies>
 		<dependency>
@@ -61,8 +61,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.11.0</version>
 				<configuration>
-					<source>11</source>
-					<target>11</target>
+					<source>8</source>
+					<target>8</target>
 				</configuration>
 			</plugin>
 			<plugin>
diff --git a/util/pom.xml b/util/pom.xml
index 9a3de76..5ed41c6 100644
--- a/util/pom.xml
+++ b/util/pom.xml
@@ -7,7 +7,7 @@
 	<version>4.0.15</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<java.version>11</java.version>
+		<java.version>8</java.version>
 	</properties>
 	<dependencies>
 		<dependency>
@@ -24,8 +24,8 @@
 				<artifactId>maven-compiler-plugin</artifactId>
 				<version>3.11.0</version>
 				<configuration>
-					<source>11</source>
-					<target>11</target>
+					<source>8</source>
+					<target>8</target>
 				</configuration>
 			</plugin>
 		</plugins>