diff --git a/pkgs/development/python-modules/btrees-py35.patch b/pkgs/development/python-modules/btrees-py35.patch
new file mode 100644
index 00000000000..77e47d670b9
--- /dev/null
+++ b/pkgs/development/python-modules/btrees-py35.patch
@@ -0,0 +1,79 @@
+From eee0beef88d135640871050b40844272a3aee790 Mon Sep 17 00:00:00 2001
+From: Tres Seaver <tseaver@palladion.com>
+Date: Tue, 15 Sep 2015 17:20:18 -0400
+Subject: [PATCH 1/2] Ensure that we don't overlook errors in first
+ PyObject_RichCompareBool call.
+
+Python 3.5 turns such cases into SystemErrors.
+
+See: https://bugs.python.org/issue23571
+
+Fixes #15.
+---
+ BTrees/_compat.h | 22 +++++++++++++++++++---
+ 1 file changed, 19 insertions(+), 3 deletions(-)
+
+diff --git a/BTrees/_compat.h b/BTrees/_compat.h
+index e004d54..19dd377 100644
+--- a/BTrees/_compat.h
++++ b/BTrees/_compat.h
+@@ -27,9 +27,25 @@
+ #define TEXT_FROM_STRING PyUnicode_FromString
+ #define TEXT_FORMAT PyUnicode_Format
+ 
+-#define COMPARE(lhs, rhs) \
+-    PyObject_RichCompareBool((lhs), (rhs), Py_LT) > 0 ? -1 : \
+-    (PyObject_RichCompareBool((lhs), (rhs), Py_EQ) > 0 ? 0 : 1)
++/* Emulate Python2's __cmp__,  wrapping PyObject_RichCompareBool(),
++ * Return -2/-3 for errors, -1 for lhs<rhs, 0 for lhs==rhs, 1 for lhs>rhs.
++ */
++static inline
++int __compare(PyObject *lhs, PyObject *rhs) {
++    int less, equal;
++
++    less = PyObject_RichCompareBool(lhs, rhs, Py_LT);
++    if ( less == -1 ) {
++        return -2;
++    }
++    equal = PyObject_RichCompareBool(lhs, rhs, Py_EQ);
++    if ( equal == -1 ) {
++        return -3;
++    }
++    return less ? -1 : (equal ? 0 : 1);
++}
++
++#define COMPARE(lhs, rhs) __compare((lhs), (rhs))
+ 
+ 
+ #else
+
+From ff4c3309fe471f2b9bdd642b8f7d1c2fe0f5e458 Mon Sep 17 00:00:00 2001
+From: Tres Seaver <tseaver@palladion.com>
+Date: Sun, 20 Sep 2015 11:07:10 -0400
+Subject: [PATCH 2/2] Avoid unnecessary comparison for 'Py_EQ' if 'Py_LT'
+ returned True.
+
+---
+ BTrees/_compat.h | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+diff --git a/BTrees/_compat.h b/BTrees/_compat.h
+index 19dd377..ece2bf9 100644
+--- a/BTrees/_compat.h
++++ b/BTrees/_compat.h
+@@ -38,11 +38,14 @@ int __compare(PyObject *lhs, PyObject *rhs) {
+     if ( less == -1 ) {
+         return -2;
+     }
++    if (less) {
++        return -1;
++    }
+     equal = PyObject_RichCompareBool(lhs, rhs, Py_EQ);
+     if ( equal == -1 ) {
+         return -3;
+     }
+-    return less ? -1 : (equal ? 0 : 1);
++    return equal ? 0 : 1;
+ }
+ 
+ #define COMPARE(lhs, rhs) __compare((lhs), (rhs))
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 9d28c13e322..f472aec99c0 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -4533,15 +4533,15 @@ let
   };
 
   pyramid = buildPythonPackage rec {
-    name = "pyramid-1.5.2";
+    name = "pyramid-1.5.7";
 
     src = pkgs.fetchurl {
       url = "http://pypi.python.org/packages/source/p/pyramid/${name}.tar.gz";
-      md5 = "d56b140b41d42f818f4349d94d968c9a";
+      sha256 = "1d29fj86724z68zcj9ximl2nrn34pflrlr6v9mwyhcv8rdf2sc61";
     };
 
     preCheck = ''
-      # test is failing, see https://github.com/Pylons/pyramid/issues/1405
+      # this will be fixed for 1.6 release, see https://github.com/Pylons/pyramid/issues/1405
       rm pyramid/tests/test_response.py
     '';
 
@@ -15600,12 +15600,12 @@ let
   };
 
   webob = buildPythonPackage rec {
-    version = "1.4";
+    version = "1.4.1";
     name = "webob-${version}";
 
     src = pkgs.fetchurl {
       url = "http://pypi.python.org/packages/source/W/WebOb/WebOb-${version}.tar.gz";
-      md5 = "8437607c0cc00c35f658f972516ffb55";
+      sha256 = "1nz9m6ijf46wfn33zfza13c0k1n4kjnmn3icdlrlgz5yj21vky0j";
     };
 
     propagatedBuildInputs = with self; [ nose ];
@@ -16049,6 +16049,8 @@ let
       sha256 = "1avvhkd7rvp3rzhw20v6ank8a8m9a1lmh99c4gjjsa1ry0zsri3y";
     };
 
+    patches = [ ../development/python-modules/btrees-py35.patch ];
+
     meta = {
       description = "scalable persistent components";
       homepage = http://packages.python.org/BTrees;