diff --git a/pom.xml b/pom.xml
index a82cfb7..967f3b4 100644
--- a/pom.xml
+++ b/pom.xml
@@ -20,7 +20,7 @@
 		<!-- dependencies -->
 		<gson.version>2.8.6</gson.version>
 		<guava.version>30.1.1-jre</guava.version>
-		<siv-mode.version>1.4.1</siv-mode.version>
+		<siv-mode.version>1.4.2</siv-mode.version>
 		<slf4j.version>1.7.30</slf4j.version>
 
 		<!-- test dependencies -->
@@ -147,6 +147,22 @@
 					<encoding>UTF-8</encoding>
 					<showWarnings>true</showWarnings>
 				</configuration>
+				<executions>
+					<execution>
+						<id>java9</id>
+						<phase>compile</phase>
+						<goals>
+							<goal>compile</goal>
+						</goals>
+						<configuration>
+							<release>9</release>
+							<compileSourceRoots>
+								<compileSourceRoot>${project.basedir}/src/main/java9</compileSourceRoot>
+							</compileSourceRoots>
+							<multiReleaseOutput>true</multiReleaseOutput>
+						</configuration>
+					</execution>
+				</executions>
 			</plugin>
 			<plugin>
 				<groupId>org.apache.maven.plugins</groupId>
@@ -160,7 +176,8 @@
 				<configuration>
 					<archive>
 						<manifestEntries>
-							<Automatic-Module-Name>org.cryptomator.cryptolib</Automatic-Module-Name>
+							<Multi-Release>true</Multi-Release>
+							<Sealed>true</Sealed>
 						</manifestEntries>
 					</archive>
 				</configuration>
diff --git a/src/main/java9/module-info.java b/src/main/java9/module-info.java
new file mode 100644
index 0000000..7111d6f
--- /dev/null
+++ b/src/main/java9/module-info.java
@@ -0,0 +1,12 @@
+module org.cryptomator.cryptolib {
+	requires org.cryptomator.siv;
+	requires com.google.gson;
+	requires com.google.common;
+	requires org.slf4j;
+
+	exports org.cryptomator.cryptolib;
+	exports org.cryptomator.cryptolib.api;
+	exports org.cryptomator.cryptolib.common;
+
+	opens org.cryptomator.cryptolib.common to com.google.gson;
+}
\ No newline at end of file