diff --git a/base-plugin/src/main/groovy/com/github/jrubygradle/internal/JRubyExecUtils.groovy b/base-plugin/src/main/groovy/com/github/jrubygradle/internal/JRubyExecUtils.groovy
index 2026f9f..19bbc67 100644
--- a/base-plugin/src/main/groovy/com/github/jrubygradle/internal/JRubyExecUtils.groovy
+++ b/base-plugin/src/main/groovy/com/github/jrubygradle/internal/JRubyExecUtils.groovy
@@ -175,7 +175,7 @@ class JRubyExecUtils {
         cmdArgs.addAll(jrubyArgs)
 
         if (useBinPath && script != null) {
-            if (script.isAbsolute() && (!script.exists())) {
+            if (script.absolute && (!script.exists())) {
                 throw new InvalidUserDataException("${script} does not exist")
             }
             cmdArgs.add(script.toString())
@@ -184,7 +184,7 @@ class JRubyExecUtils {
                 throw new InvalidUserDataException('No `script` property defined and no inline script provided')
             }
 
-            if (jrubyArgs.isEmpty()) {
+            if (jrubyArgs.empty) {
                 throw new InvalidUserDataException('Cannot build JRuby execution arguments with either `script` or `jrubyArgs` set')
             }
         }
diff --git a/docs/build.gradle b/docs/build.gradle
index d066839..59fb6f3 100644
--- a/docs/build.gradle
+++ b/docs/build.gradle
@@ -5,7 +5,7 @@ buildscript {
     }
     dependencies {
         /* wow. so recursion */
-        classpath "com.github.jruby-gradle:jruby-gradle-plugin:1.0.3"
+        classpath "com.github.jruby-gradle:jruby-gradle-plugin:1.1.1"
     }
 }
 apply plugin: 'org.ajoberstar.github-pages'
diff --git a/gradle.properties b/gradle.properties
index 0eb590f..736688e 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,4 +1,4 @@
-version=2.1.0-beta.0
+version=2.1.0-beta.1
 group=com.github.jruby-gradle
 copyrightYear=2014-2023