diff --git a/pkgs/tools/admin/simp_le/default.nix b/pkgs/tools/admin/simp_le/default.nix
index ca0e16c1185a..9d7e7c8c8d92 100644
--- a/pkgs/tools/admin/simp_le/default.nix
+++ b/pkgs/tools/admin/simp_le/default.nix
@@ -1,17 +1,19 @@
 { stdenv, pythonPackages, bash }:
- 
+
 pythonPackages.buildPythonApplication rec {
   pname = "simp_le-client";
-  version = "0.8.0";
+  version = "0.9.0";
 
   src = pythonPackages.fetchPypi {
     inherit pname version;
-    sha256 = "0nv9mm99rm8i9flgfgwvmajbsxb5rm162nfxlq3wk66bbbyr6y1i";
+    sha256 = "1yxfznd78zkg2f657v520zj5w4dvq5n594d0kpm4lra8xnpg4zcv";
   };
 
   postPatch = ''
     # drop upper bound of acme requirement
     sed -ri "s/'(acme>=[^,]+),<[^']+'/'\1'/" setup.py
+    # drop upper bound of idna requirement
+    sed -ri "s/'(idna)<[^']+'/'\1'/" setup.py
     substituteInPlace simp_le.py \
       --replace "/bin/sh" "${bash}/bin/sh"
   '';
@@ -20,7 +22,7 @@ pythonPackages.buildPythonApplication rec {
     $out/bin/simp_le --test
   '';
 
-  propagatedBuildInputs = with pythonPackages; [ acme setuptools_scm josepy ];
+  propagatedBuildInputs = with pythonPackages; [ acme setuptools_scm josepy idna ];
 
   meta = with stdenv.lib; {
     homepage = https://github.com/zenhack/simp_le;
@@ -30,4 +32,3 @@ pythonPackages.buildPythonApplication rec {
     platforms = platforms.all;
   };
 }
-