diff --git a/pkgs/python-packages.nix b/pkgs/python-packages.nix
--- a/pkgs/python-packages.nix
+++ b/pkgs/python-packages.nix
@@ -374,15 +374,15 @@ self: super: {
     };
   };
   "pathlib2" = super.buildPythonPackage {
-    name = "pathlib2-2.3.3";
+    name = "pathlib2-2.3.4";
     doCheck = false;
     propagatedBuildInputs = [
       self."six"
       self."scandir"
     ];
     src = fetchurl {
-      url = "https://files.pythonhosted.org/packages/bf/d7/a2568f4596b75d2c6e2b4094a7e64f620decc7887f69a1f2811931ea15b9/pathlib2-2.3.3.tar.gz";
-      sha256 = "0hpp92vqqgcd8h92msm9slv161b1q160igjwnkf2ag6cx0c96695";
+      url = "https://files.pythonhosted.org/packages/b5/f4/9c7cc726ece2498b6c8b62d3262aa43f59039b953fe23c9964ac5e18d40b/pathlib2-2.3.4.tar.gz";
+      sha256 = "1y0f9rkm1924zrc5dn4bwxlhgdkbml82lkcc28l5rgmr7d918q24";
     };
     meta = {
       license = [ pkgs.lib.licenses.mit ];
diff --git a/requirements_pinned.txt b/requirements_pinned.txt
--- a/requirements_pinned.txt
+++ b/requirements_pinned.txt
@@ -3,7 +3,7 @@
 atomicwrites==1.2.1
 attrs==18.2.0
 hupper==1.6.1
-pathlib2==2.3.3
+pathlib2==2.3.4
 pygments==2.4.2
 psutil==5.5.1
 pluggy==0.11.0