diff --git a/.github/workflows/maven_release.yml b/.github/workflows/maven_release.yml
index aa7fe18..15e3d64 100644
--- a/.github/workflows/maven_release.yml
+++ b/.github/workflows/maven_release.yml
@@ -15,10 +15,10 @@ jobs:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           fetch-depth: 0
-      - name: Set up JDK 8
+      - name: Set up JDK 11
         uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
         with:
-          java-version: 8
+          java-version: 11
           distribution: 'temurin'
       - name: Cache and restore Maven packages on master
         uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
@@ -59,7 +59,7 @@ jobs:
       - name: Set up Maven Central Repository
         uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
         with:
-          java-version: 8
+          java-version: 11
           distribution: 'temurin'
           server-id: central
           server-username: MAVEN_USERNAME
diff --git a/.github/workflows/maven_test.yml b/.github/workflows/maven_test.yml
index 0513cc0..b9a64da 100644
--- a/.github/workflows/maven_test.yml
+++ b/.github/workflows/maven_test.yml
@@ -17,10 +17,10 @@ jobs:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
         with:
           fetch-depth: 0
-      - name: Set up JDK 8
+      - name: Set up JDK 11
         uses: actions/setup-java@dded0888837ed1f317902acf8a20df0ad188d165 # v5.0.0
         with:
-          java-version: 8
+          java-version: 11
           distribution: 'temurin'
       - name: Cache and restore Maven packages on master
         uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
diff --git a/pom.xml b/pom.xml
index 0960f3e..74c7fc0 100644
--- a/pom.xml
+++ b/pom.xml
@@ -31,7 +31,7 @@
         <!-- Generate PackageVersion.java into this directory. -->
         <packageVersion.dir>org/openapitools/jackson/nullable</packageVersion.dir>
         <packageVersion.package>${project.groupId}.jackson.nullable</packageVersion.package>
-        <java.version>1.8</java.version>
+        <java.version>8</java.version>
 
         <!-- region Dependency Versions -->
         <!-- Validator 8+ requires Java 11, Validator 9+ requires Java 17. -->
@@ -141,10 +141,31 @@
             <plugin>
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>${maven-compiler-plugin.version}</version>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                </configuration>
+                <executions>
+                    <execution>
+                        <id>compile-java-8</id>
+                        <goals>
+                            <goal>compile</goal>
+                        </goals>
+                        <configuration>
+                            <release>${java.version}</release>
+                        </configuration>
+                    </execution>
+                    <execution>
+                        <id>compile-java-9</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>
@@ -179,7 +200,7 @@
                 <configuration>
                     <archive>
                         <manifestEntries>
-                            <Automatic-Module-Name>org.openapitools.jackson.nullable</Automatic-Module-Name>
+                            <Multi-Release>true</Multi-Release>
                         </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..33b04dc
--- /dev/null
+++ b/src/main/java9/module-info.java
@@ -0,0 +1,11 @@
+module org.openapitools.jackson.nullable {
+    requires com.fasterxml.jackson.databind;
+    requires static jakarta.validation;
+    requires static java.validation;
+
+    exports org.openapitools.jackson.nullable;
+
+    provides com.fasterxml.jackson.databind.Module with org.openapitools.jackson.nullable.JsonNullableModule;
+    provides javax.validation.valueextraction.ValueExtractor with org.openapitools.jackson.nullable.JsonNullableValueExtractor;
+    provides jakarta.validation.valueextraction.ValueExtractor with org.openapitools.jackson.nullable.JsonNullableJakartaValueExtractor;
+}