Build with API version 2.13.1

Change-Id: I499b388ef4d65d539362b8132c52da9d2478bb1b
diff --git a/lib/gerrit/BUCK b/lib/gerrit/BUCK
index 1df977d..42d492c 100644
--- a/lib/gerrit/BUCK
+++ b/lib/gerrit/BUCK
@@ -1,12 +1,12 @@
 include_defs('//bucklets/maven_jar.bucklet')
 
-VER = '2.12.1'
+VER = '2.13.1'
 REPO = MAVEN_CENTRAL
 
 maven_jar(
   name = 'plugin-api',
   id = 'com.google.gerrit:gerrit-plugin-api:' + VER,
-  sha1 = 'd15de32f16d538e83f02a033be0667c55ec5f8df',
+  sha1 = '8e12346dbb677d70987afdbec5352ff6e889a181',
   license = 'Apache2.0',
   attach_source = False,
   repository = REPO,