diff --git a/.java-version b/.java-version
new file mode 100644
index 0000000..6259340
--- /dev/null
+++ b/.java-version
@@ -0,0 +1 @@
+1.8
diff --git a/pom.xml b/pom.xml
index d1e6d30..f6ac35e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -272,10 +272,20 @@
                                         <requireJavaVersion>
                                             <version>1.8.0</version>
                                         </requireJavaVersion>
+                                        <enforceBytecodeVersion>
+                                            <maxJdkVersion>1.8</maxJdkVersion>
+                                        </enforceBytecodeVersion>
                                     </rules>
                                 </configuration>
                             </execution>
                         </executions>
+                        <dependencies>
+                            <dependency>
+                                <groupId>org.codehaus.mojo</groupId>
+                                <artifactId>extra-enforcer-rules</artifactId>
+                                <version>1.9.0</version>
+                            </dependency>
+                        </dependencies>
                     </plugin>
                     <plugin>
                         <groupId>org.apache.maven.plugins</groupId>