Version 1.3.9
diff --git a/build.gradle b/build.gradle
index a758393..5538348 100644
--- a/build.gradle
+++ b/build.gradle
@@ -52,7 +52,13 @@
 
     repositories {
         jcenter()
-        maven { url "https://kotlin.bintray.com/kotlinx" }
+        maven {
+            url "https://kotlin.bintray.com/kotlinx"
+            credentials {
+                username = project.hasProperty('bintrayUser') ? project.property('bintrayUser') : System.getenv('BINTRAY_USER') ?: ""
+                password = project.hasProperty('bintrayApiKey') ? project.property('bintrayApiKey') : System.getenv('BINTRAY_API_KEY') ?: ""
+            }
+        }
         maven {
             url "https://kotlin.bintray.com/kotlin-dev"
             credentials {
@@ -155,7 +161,14 @@
             }
         }
         maven { url "https://kotlin.bintray.com/kotlin-eap" }
-        maven { url "https://kotlin.bintray.com/kotlinx" }
+        maven {
+            url "https://kotlin.bintray.com/kotlinx"
+            credentials {
+                username = project.hasProperty('bintrayUser') ? project.property('bintrayUser') : System.getenv('BINTRAY_USER') ?: ""
+                password = project.hasProperty('bintrayApiKey') ? project.property('bintrayApiKey') : System.getenv('BINTRAY_API_KEY') ?: ""
+            }
+        }
+        mavenLocal()
     }
 }