diff --git a/build.gradle b/build.gradle
index 6acf477..f0feceb 100644
--- a/build.gradle
+++ b/build.gradle
@@ -61,7 +61,7 @@ task fatJar(type: Jar) {
 dependencies {
     testCompile group: 'junit', name: 'junit', version: '4.12'
 
-    compile 'com.squareup.retrofit2:retrofit:2.3.0'
+    compile 'com.squareup.retrofit2:retrofit:2.9.0'
     compile 'com.squareup.retrofit2:converter-jackson:2.3.0'
     compile group: 'com.fasterxml.jackson.datatype', name: 'jackson-datatype-jsr310', version: '2.9.4'
     compile 'com.fasterxml.jackson.datatype:jackson-datatype-joda:2.9.0'