diff --git a/pkgs/development/python-modules/cymem/default.nix b/pkgs/development/python-modules/cymem/default.nix
index f01011156273..6292bf259ef4 100644
--- a/pkgs/development/python-modules/cymem/default.nix
+++ b/pkgs/development/python-modules/cymem/default.nix
@@ -7,25 +7,34 @@
 
 buildPythonPackage rec {
   pname = "cymem";
-  version = "2.0.6";
+  version = "2.0.7";
 
   src = fetchFromGitHub {
     owner = "explosion";
     repo = "cymem";
-    rev = "v${version}";
-    sha256 = "sha256-o+44v6wvE9HxeQaDDQ0+gi7z1V7jtkZvWglY8UyVHLg=";
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-lYMRFFMS+ETjWd4xi12ezC8CVLbLJfynmOU1DpYQcck=";
   };
 
   propagatedBuildInputs = [
     cython
   ];
 
-  checkInputs = [ pytestCheckHook ];
+  checkInputs = [
+    pytestCheckHook
+  ];
 
   preCheck = ''
-    cd cymem
+    TEMPDIR=$(mktemp -d)
+    cp -R cymem/tests $TEMPDIR/
+    pushd $TEMPDIR
   '';
 
+  postCheck = ''
+    popd
+  '';
+
+
   meta = with lib; {
     description = "Cython memory pool for RAII-style memory management";
     homepage = "https://github.com/explosion/cymem";