Build with API version 2.13-rc1

Change-Id: I53823e263d52d5ebc7efd95bbffc07528a4bf762
diff --git a/lib/gerrit/BUCK b/lib/gerrit/BUCK
index 6f4b8f6..4e3746b 100644
--- a/lib/gerrit/BUCK
+++ b/lib/gerrit/BUCK
@@ -1,11 +1,12 @@
 include_defs('//bucklets/maven_jar.bucklet')
 
-VER = '2.13-SNAPSHOT'
+VER = '2.13-rc1'
 REPO = MAVEN_CENTRAL
 
 maven_jar(
   name = 'plugin-api',
   id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
+  sha1 = '80d048ce9f99b9beba20a7b2df68a0ae32551278',
   license = 'Apache2.0',
   attach_source = False,
   repository = REPO,