diff --git a/gallery_dl/extractor/zerochan.py b/gallery_dl/extractor/zerochan.py
index fca89115..e1b4897d 100644
--- a/gallery_dl/extractor/zerochan.py
+++ b/gallery_dl/extractor/zerochan.py
@@ -55,7 +55,8 @@ class ZerochanExtractor(BooruExtractor):
             "login"   : "Login",
         }
 
-        response = self.request(url, method="POST", headers=headers, data=data)
+        response = self.request(
+            url, method="POST", headers=headers, data=data, expected=(500,))
         if not response.history:
             raise exception.AuthenticationError()
 
diff --git a/gallery_dl/version.py b/gallery_dl/version.py
index 8020352e..34de7c75 100644
--- a/gallery_dl/version.py
+++ b/gallery_dl/version.py
@@ -6,5 +6,5 @@
 # it under the terms of the GNU General Public License version 2 as
 # published by the Free Software Foundation.
 
-__version__ = "1.30.5"
+__version__ = "1.30.6-dev"
 __variant__ = None