diff --git a/pywb/apps/rewriterapp.py b/pywb/apps/rewriterapp.py
index db1da528..e18489be 100644
--- a/pywb/apps/rewriterapp.py
+++ b/pywb/apps/rewriterapp.py
@@ -329,7 +329,7 @@ class RewriterApp(object):
 
                 return resp
 
-        self._add_custom_params(cdx, r.headers, kwargs)
+        self._add_custom_params(cdx, r.headers, kwargs, record)
 
         if self._add_range(record, wb_url, range_start, range_end):
             wb_url.mod = 'id_'
@@ -626,7 +626,7 @@ class RewriterApp(object):
     def get_cookie_key(self, kwargs):
         raise NotImplemented()
 
-    def _add_custom_params(self, cdx, headers, kwargs):
+    def _add_custom_params(self, cdx, headers, kwargs, record):
         pass
 
     def get_top_frame_params(self, wb_url, kwargs):
diff --git a/requirements.txt b/requirements.txt
index 4702d5df..f86c8c1c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 six
-warcio>=1.5.0
+warcio>=1.5.2
 chardet
 requests
 redis
@@ -12,4 +12,4 @@ webencodings
 gevent==1.2.2
 webassets==0.12.1
 portalocker
-wsgiprox>=1.4.1
+wsgiprox>=1.5.0