diff --git a/pkgs/development/python-modules/pytest/default.nix b/pkgs/development/python-modules/pytest/default.nix
index 91e22baa4ad..9b7f5cc12de 100644
--- a/pkgs/development/python-modules/pytest/default.nix
+++ b/pkgs/development/python-modules/pytest/default.nix
@@ -2,7 +2,7 @@
 , setuptools_scm, setuptools, six, pluggy, funcsigs, isPy3k
 }:
 buildPythonPackage rec {
-  version = "3.3.2";
+  version = "3.4.0";
   pname = "pytest";
 
   preCheck = ''
@@ -12,7 +12,7 @@ buildPythonPackage rec {
 
   src = fetchPypi {
     inherit pname version;
-    sha256 = "53548280ede7818f4dc2ad96608b9f08ae2cc2ca3874f2ceb6f97e3583f25bc4";
+    sha256 = "6074ea3b9c999bd6d0df5fa9d12dd95ccd23550df2a582f5f5b848331d2e82ca";
   };
 
   checkInputs = [ hypothesis ];
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 5c6ba0b0b82..87c96d56e9b 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -3217,9 +3217,9 @@ in {
     };
   };
 
-  pytest = self.pytest_33;
+  pytest = self.pytest_34;
 
-  pytest_33 = callPackage ../development/python-modules/pytest/default.nix{
+  pytest_34 = callPackage ../development/python-modules/pytest/default.nix{
     hypothesis = self.hypothesis.override {
       # hypothesis requires pytest that causes dependency cycle
       doCheck = false;