diff --git a/README.md b/README.md
index 1afe900..620222d 100644
--- a/README.md
+++ b/README.md
@@ -172,6 +172,7 @@ JSDoc 3 options:
 - *(Must declare this or `requirejs.options`)* requirejs.buildprofile = File reference for config [example](https://github.com/eriwen/gradle-js-plugin/blob/master/src/test/resources/requirejs/build.js)
 - requirejs.options = Map of options [require.js docs](http://requirejs.org/docs/optimization.html#options)
 - *(Optional)* ignoreExitCode = Fail build if `false` and require.js did not run successfully. Default is `false`.
+- *(Optional)* impl = r.js implementation file.  Version 2.1.4 is provided within this plugin.  Specifying this option allows users to specify a version of the require optimizer of their own choosing
 
 What, you want more? [Tell me!](https://github.com/eriwen/gradle-js-plugin/issues)
 
@@ -184,6 +185,7 @@ This project is made possible due to the efforts of these fine people:
 * Martin Ziel - Allowing minifyJs task to accept multiple files as input
 * [Joe Fitzgerald](https://github.com/joefitzgerald) - JSHint and RequireJS features
 * [levsa](https://github.com/levsa) - JSHint predef and checkstyle reporter
+* [Martin Snyder](https://github.com/MartinSnyder) - requireJs impl option
 
 ## See Also
 The [Gradle CSS Plugin](https://github.com/eriwen/gradle-css-plugin)!
diff --git a/src/main/groovy/com/eriwen/gradle/js/tasks/RequireJsTask.groovy b/src/main/groovy/com/eriwen/gradle/js/tasks/RequireJsTask.groovy
index e5e178c..0017952 100644
--- a/src/main/groovy/com/eriwen/gradle/js/tasks/RequireJsTask.groovy
+++ b/src/main/groovy/com/eriwen/gradle/js/tasks/RequireJsTask.groovy
@@ -24,6 +24,7 @@ import org.gradle.api.tasks.OutputFile
 
 class RequireJsTask extends SourceTask {
     private static final String REQUIREJS_PATH = 'r.js'
+    private static final String REQUIREJS_IMPLEMENTATION_OPTION = "impl"
     private static final String TMP_DIR = "tmp${File.separator}js"
     private static final ResourceUtil RESOURCE_UTIL = new ResourceUtil()
     private final RhinoExec rhino = new RhinoExec(project)
@@ -37,10 +38,19 @@ class RequireJsTask extends SourceTask {
 
     @TaskAction
     def run() {
-        final File requireJsFile = RESOURCE_UTIL.extractFileToDirectory(new File(project.buildDir, TMP_DIR), REQUIREJS_PATH)
         LinkedHashMap<String, Object> options = [] // [optimize: "none", logLevel: 2, skipModuleInsertion: false, out: dest]
         options.putAll(project.requirejs.options)
 
+        final File requireJsFile
+        if (options.containsKey(REQUIREJS_IMPLEMENTATION_OPTION)) {
+            requireJsFile = new File(options.get(REQUIREJS_IMPLEMENTATION_OPTION))
+
+            // This option applies to the task itself, and does not need to be passed on to Rhino or the r.js script itself
+            options.remove(REQUIREJS_IMPLEMENTATION_OPTION)
+        } else {
+            requireJsFile = RESOURCE_UTIL.extractFileToDirectory(new File(project.buildDir, TMP_DIR), REQUIREJS_PATH)
+        }
+
         final List<String> args = [requireJsFile.canonicalPath]
         args.add("-o")
         if (project.requirejs.buildprofile != null && project.requirejs.buildprofile.class == File && project.requirejs.buildprofile.exists()) {
diff --git a/src/test/groovy/com/eriwen/gradle/js/RequireJsTaskTest.groovy b/src/test/groovy/com/eriwen/gradle/js/RequireJsTaskTest.groovy
index 6c25bc8..83eac55 100644
--- a/src/test/groovy/com/eriwen/gradle/js/RequireJsTaskTest.groovy
+++ b/src/test/groovy/com/eriwen/gradle/js/RequireJsTaskTest.groovy
@@ -50,6 +50,34 @@ class RequireJsTaskTest extends Specification {
         ExecException e = thrown()
     }
 
+    def "runWithInvalidRequireImplementation"() {
+        given:
+        project.requirejs.options = [baseUrl: ".", "paths.jquery": "jam/jquery/dist/jquery", name: "main", out: "main-built.js", "impl": "bad.r.js"]
+        task.ignoreExitCode = false
+        addMainFile()
+        addJamDir()
+
+        when:
+        task.run()
+
+        then:
+        ExecException e = thrown()
+    }
+
+    def "runWithAlternateRequireImplementation"() {
+        given:
+        project.requirejs.options = [baseUrl: ".", "paths.jquery": "jam/jquery/dist/jquery", name: "main", out: "main-built.js", "impl": "src/test/resources/requirejs/r.2.1.4.js"]
+        task.ignoreExitCode = false
+        addMainFile()
+        addJamDir()
+
+        when:
+        task.run()
+
+        then:
+        notThrown ExecException
+    }
+
     def "runWithBuildProfile"() {
         given:
         project.requirejs.buildprofile = new File("${project.projectDir.absolutePath}${File.separator}build.js")