diff --git a/pkgs/development/python-modules/pytest/default.nix b/pkgs/development/python-modules/pytest/default.nix
index 71696085b094..457826f26cbc 100644
--- a/pkgs/development/python-modules/pytest/default.nix
+++ b/pkgs/development/python-modules/pytest/default.nix
@@ -1,8 +1,8 @@
 { stdenv, buildPythonPackage, fetchPypi, isPy26, argparse, attrs, hypothesis, py
-, setuptools_scm, setuptools, six, pluggy, funcsigs, isPy3k
+, setuptools_scm, setuptools, six, pluggy, funcsigs, isPy3k, more-itertools
 }:
 buildPythonPackage rec {
-  version = "3.4.2";
+  version = "3.5.0";
   pname = "pytest";
 
   preCheck = ''
@@ -12,12 +12,12 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "1idq7s8da2p82ynf9fcg77rzj1dsagg3bpsrlslf31x7q4vasyqi";
+    sha256 = "fae491d1874f199537fd5872b5e1f0e74a009b979df9d53d1553fd03da1703e1";
   };
 
   checkInputs = [ hypothesis ];
   buildInputs = [ setuptools_scm ];
-  propagatedBuildInputs = [ attrs py setuptools six pluggy ]
+  propagatedBuildInputs = [ attrs py setuptools six pluggy more-itertools ]
     ++ (stdenv.lib.optional (!isPy3k) funcsigs)
     ++ (stdenv.lib.optional isPy26 argparse);
 
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index d6f8e2a6e797..e134eb23993b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -1893,9 +1893,9 @@ in {
     };
   };
 
-  pytest = self.pytest_34;
+  pytest = self.pytest_35;
 
-  pytest_34 = callPackage ../development/python-modules/pytest {
+  pytest_35 = callPackage ../development/python-modules/pytest {
     hypothesis = self.hypothesis.override {
       # hypothesis requires pytest that causes dependency cycle
       doCheck = false;
@@ -1904,7 +1904,7 @@ in {
   };
 
   # Needed for celery
-  pytest_32 = self.pytest_34.overrideAttrs( oldAttrs: rec {
+  pytest_32 = self.pytest_35.overrideAttrs( oldAttrs: rec {
     version = "3.2.5";
     src = oldAttrs.src.override {
       inherit version;