diff --git a/pkgs/python-packages.nix b/pkgs/python-packages.nix
--- a/pkgs/python-packages.nix
+++ b/pkgs/python-packages.nix
@@ -575,13 +575,13 @@
     };
   };
   deform = super.buildPythonPackage {
-    name = "deform-2.0.4";
+    name = "deform-2.0.5";
     buildInputs = with self; [];
     doCheck = false;
     propagatedBuildInputs = with self; [Chameleon colander iso8601 peppercorn translationstring zope.deprecation];
     src = fetchurl {
-      url = "https://files.pythonhosted.org/packages/66/3b/eefcb07abcab7a97f6665aa2d0cf1af741d9d6e78a2e4657fd2b89f89880/deform-2.0.4.tar.gz";
-      sha256 = "a9527ce0c55a3c744844b378ba0fd0eab964043ffae0a046e747923c61f50436";
+      url = "https://files.pythonhosted.org/packages/0c/b1/ba711d5808c12538c8504f534d79c124ed834f19ac36f0ac5391c3bbd1c1/deform-2.0.5.tar.gz";
+      sha256 = "874d3346a02c500432efdcc73b1a7174aa0ea69cd52a99bb9a812967f54f6f79";
     };
     meta = {
       license = [ { fullName = "BSD-derived (http://www.repoze.org/LICENSE.txt)"; } ];
diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,7 +14,7 @@ colander==1.4.0
 configobj==5.0.6
 cssselect==1.0.1
 decorator==4.1.2
-deform==2.0.4
+deform==2.0.5
 docutils==0.14.0
 dogpile.cache==0.6.4
 dogpile.core==0.4.1