diff --git a/pkgs/development/python-modules/markdownsuperscript/default.nix b/pkgs/development/python-modules/markdownsuperscript/default.nix
index 62bf7a93098..1212651aec8 100644
--- a/pkgs/development/python-modules/markdownsuperscript/default.nix
+++ b/pkgs/development/python-modules/markdownsuperscript/default.nix
@@ -1,4 +1,5 @@
-{ stdenv, buildPythonPackage, fetchPypi, markdown }:
+{ stdenv, buildPythonPackage, fetchPypi, markdown,
+  pytest, pytestrunner, pytestcov, coverage }:
 
 buildPythonPackage rec {
   pname = "MarkdownSuperscript";
@@ -11,7 +12,15 @@ buildPythonPackage rec {
 
   propagatedBuildInputs = [ markdown ];
 
-  doCheck = false; # See https://github.com/NixOS/nixpkgs/pull/26985
+  postPatch = ''
+    # remove version bounds for Markdown dependency
+    sed 's/\["Markdown.*"\]/["Markdown"]/' -i setup.py
+
+    # remove version bounds for test dependencies
+    sed 's/=.*//' -i requirements/*.txt
+  '';
+
+  checkInputs = [ pytest pytestrunner pytestcov coverage ];
 
   meta = {
     description = "An extension to the Python Markdown package enabling superscript text";