diff --git a/pkgs/development/python-modules/json-schema-for-humans/default.nix b/pkgs/development/python-modules/json-schema-for-humans/default.nix
index f9452a25b7ab..aa70a35bd079 100644
--- a/pkgs/development/python-modules/json-schema-for-humans/default.nix
+++ b/pkgs/development/python-modules/json-schema-for-humans/default.nix
@@ -28,7 +28,7 @@ buildPythonPackage rec {
     owner = "coveooss";
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256-gaholnLO5oIQaXgliuvlU2MfpjiCMgAPplOPgvMYim8=";
+    hash = "sha256-gaholnLO5oIQaXgliuvlU2MfpjiCMgAPplOPgvMYim8=";
   };
 
   nativeBuildInputs = [
@@ -54,6 +54,12 @@ buildPythonPackage rec {
     pytestCheckHook
   ];
 
+  postPatch = ''
+    # https://github.com/coveooss/json-schema-for-humans/issues/127
+    substituteInPlace pyproject.toml \
+      --replace 'PyYAML = "^5.4.1"' 'PyYAML = "*"'
+  '';
+
   disabledTests = [
     # Tests require network access
     "test_references_url"