Update auth library to fix jwt_token_creds interop test
diff --git a/build.gradle b/build.gradle
index 4c6b6e5..0c0315c 100644
--- a/build.gradle
+++ b/build.gradle
@@ -139,7 +139,7 @@
                 javaee_api: 'javax:javaee-api:7.0',
                 jsonp: 'org.glassfish:javax.json:1.0.4',
                 jsr305: 'com.google.code.findbugs:jsr305:3.0.0',
-                oauth_client: 'com.google.auth:google-auth-library-oauth2-http:0.2.0',
+                oauth_client: 'com.google.auth:google-auth-library-oauth2-http:0.3.0',
                 okhttp: 'com.squareup.okhttp:okhttp:2.4.0',
                 protobuf: "com.google.protobuf:protobuf-java:${protobufVersion}",
                 protobuf_nano: "com.google.protobuf.nano:protobuf-javanano:${protobufNanoVersion}",