diff --git a/build.gradle b/build.gradle
index 993ca07..727a3e9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -30,7 +30,7 @@ def getDevelopmentVersion() {
 
 
 def releaseVersion = System.getProperty("RELEASE_VERSION")
-version = releaseVersion ? releaseVersion : getDevelopmentVersion()
+releaseVersion ? releaseVersion : getDevelopmentVersion()
 group = 'com.graphql-java'
 
 sourceCompatibility = 1.8
@@ -43,7 +43,7 @@ repositories {
 
 
 dependencies {
-    compile "com.graphql-java:graphql-java:10.0"
+    compile "com.graphql-java:graphql-java:15.0"
     compile "com.squareup.okhttp3:okhttp:3.2.0"
 
     testCompile 'org.spockframework:spock-core:1.1-groovy-2.4'