diff --git a/inapp-billing-v3.iml b/inapp-billing-v3.iml
index 55503402..42f4ed55 100644
--- a/inapp-billing-v3.iml
+++ b/inapp-billing-v3.iml
@@ -7,7 +7,7 @@
       </configuration>
     </facet>
   </component>
-  <component name="NewModuleRootManager" inherit-compiler-output="false">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
     <output url="file://$MODULE_DIR$/build/classes/main" />
     <output-test url="file://$MODULE_DIR$/build/classes/test" />
     <exclude-output />
diff --git a/library/build.gradle b/library/build.gradle
index fd99b88a..9f81bf8e 100644
--- a/library/build.gradle
+++ b/library/build.gradle
@@ -3,7 +3,7 @@ apply plugin: 'maven'
 apply plugin: 'signing'
 
 group 'com.anjlab.android.iab.v3'
-version '1.0.19'
+version '1.0.20'
 
 android {
     compileSdkVersion 8
diff --git a/library/library.iml b/library/library.iml
index 39810a4b..e39785a0 100644
--- a/library/library.iml
+++ b/library/library.iml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="com.anjlab.android.iab.v3" external.system.module.version="1.0.17" type="JAVA_MODULE" version="4">
+<module external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="com.anjlab.android.iab.v3" external.system.module.version="1.0.20" type="JAVA_MODULE" version="4">
   <component name="FacetManager">
     <facet type="android-gradle" name="Android-Gradle">
       <configuration>
@@ -9,6 +9,7 @@
     <facet type="android" name="Android">
       <configuration>
         <option name="SELECTED_BUILD_VARIANT" value="release" />
+        <option name="SELECTED_TEST_ARTIFACT" value="_android_test_" />
         <option name="ASSEMBLE_TASK_NAME" value="assembleRelease" />
         <option name="COMPILE_JAVA_TASK_NAME" value="compileReleaseSources" />
         <option name="SOURCE_GEN_TASK_NAME" value="generateReleaseSources" />
@@ -72,7 +73,9 @@
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/res" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/rs" />
       <excludeFolder url="file://$MODULE_DIR$/build/intermediates/symbols" />
+      <excludeFolder url="file://$MODULE_DIR$/build/libs" />
       <excludeFolder url="file://$MODULE_DIR$/build/outputs" />
+      <excludeFolder url="file://$MODULE_DIR$/build/poms" />
       <excludeFolder url="file://$MODULE_DIR$/build/tmp" />
     </content>
     <orderEntry type="jdk" jdkName="Android API 8 Platform" jdkType="Android SDK" />
diff --git a/sample/libs/anjlab-iabv3-current.jar b/sample/libs/anjlab-iabv3-current.jar
index 731ce0b4..582142d1 100644
Binary files a/sample/libs/anjlab-iabv3-current.jar and b/sample/libs/anjlab-iabv3-current.jar differ