diff --git a/app/build.gradle b/app/build.gradle
index b210b9b..0878d39 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -10,15 +10,15 @@ android {
         applicationId "com.github.axet.audiorecorder"
         minSdkVersion 9
         targetSdkVersion 26
-        versionCode 291
-        versionName "3.2.33"
+        versionCode 292
+        versionName "3.2.34"
     }
     signingConfigs {
         release {
-            storeFile file(RELEASE_STORE_FILE)
-            storePassword RELEASE_STORE_PASSWORD
-            keyAlias RELEASE_KEY_ALIAS
-            keyPassword RELEASE_KEY_PASSWORD
+            storeFile file(prop('RELEASE_STORE_FILE')?:'none')
+            storePassword prop('RELEASE_STORE_PASSWORD')
+            keyAlias prop('RELEASE_KEY_ALIAS')
+            keyPassword prop('RELEASE_KEY_PASSWORD')
         }
     }
     buildTypes {
@@ -57,5 +57,5 @@ android {
 
 dependencies {
     testImplementation 'junit:junit:4.12'
-    implementation 'com.github.axet:android-audio-library:1.0.133' // implementation project(':android-audio-library')
+    implementation 'com.github.axet:android-audio-library:1.0.135' // implementation project(':android-audio-library')
 }
diff --git a/build.gradle b/build.gradle
index ff317bb..f36649d 100644
--- a/build.gradle
+++ b/build.gradle
@@ -25,3 +25,7 @@ task wrapper(type: Wrapper) {
 task clean(type: Delete) {
     delete rootProject.buildDir
 }
+
+def prop(String name) {
+    project.hasProperty(name) ? project.getProperty(name) : null
+}