diff --git a/pkgs/development/python-modules/elementpath/default.nix b/pkgs/development/python-modules/elementpath/default.nix
index fd4b99fd5f4..5a3a9b0110d 100644
--- a/pkgs/development/python-modules/elementpath/default.nix
+++ b/pkgs/development/python-modules/elementpath/default.nix
@@ -1,7 +1,7 @@
 { lib, buildPythonPackage, fetchFromGitHub, isPy27 }:
 
 buildPythonPackage rec {
-  version = "1.4.6";
+  version = "2.0.0";
   pname = "elementpath";
   disabled = isPy27; # uses incompatible class syntax
 
@@ -9,7 +9,7 @@ buildPythonPackage rec {
     owner = "sissaschool";
     repo = "elementpath";
     rev = "v${version}";
-    sha256 = "0prrqyiw9s9wf91s4f0vhqb9babs43aq24naa66qlirskdm87pav";
+    sha256 = "16kfbiy87qjl07y3iin8jdjhz8j28wlwnkwxq9a0752ipjjg869p";
   };
 
   # avoid circular dependency with xmlschema which directly depends on this
diff --git a/pkgs/development/python-modules/xmlschema/default.nix b/pkgs/development/python-modules/xmlschema/default.nix
index 72b524d999e..ac2a323aed5 100644
--- a/pkgs/development/python-modules/xmlschema/default.nix
+++ b/pkgs/development/python-modules/xmlschema/default.nix
@@ -5,14 +5,14 @@
 }:
 
 buildPythonPackage rec {
-  version = "1.2.2";
+  version = "1.2.3";
   pname = "xmlschema";
 
   src = fetchFromGitHub {
     owner = "sissaschool";
     repo = "xmlschema";
     rev = "v${version}";
-    sha256 = "04rlcm5777cv7aw9mf0z1xrj8cn2rljfzs9i2za6sdk6h1ngpj3q";
+    sha256 = "1lasi84d5v66xpd40fbj3lqwc5hfh3izxrr2wbfdbj4a3m996zc9";
   };
 
   propagatedBuildInputs = [ elementpath ];
@@ -21,7 +21,7 @@ buildPythonPackage rec {
 
   postPatch = ''
     substituteInPlace setup.py \
-      --replace "elementpath~=1.4.0" "elementpath~=1.4"
+      --replace "elementpath~=2.0.0" "elementpath~=2.0"
   '';
 
   # Ignore broken fixtures, and tests for files which don't exist.