diff --git a/website/_harp.json b/website/_harp.json
index dae05528a..32e6874d7 100644
--- a/website/_harp.json
+++ b/website/_harp.json
@@ -54,7 +54,7 @@
             }
         },
 
-        "V_CSS": "1.12",
+        "V_CSS": "1.13",
         "V_JS": "1.0",
         "DEFAULT_SYNTAX" : "python",
         "ANALYTICS": "UA-58931649-1",