diff --git a/pkgs/development/python-modules/sigstore-protobuf-specs/default.nix b/pkgs/development/python-modules/sigstore-protobuf-specs/default.nix
index e3f8bb0f17d7..29b10ba1e85a 100644
--- a/pkgs/development/python-modules/sigstore-protobuf-specs/default.nix
+++ b/pkgs/development/python-modules/sigstore-protobuf-specs/default.nix
@@ -5,11 +5,12 @@
   fetchPypi,
   buildPythonPackage,
   betterproto,
+  pydantic,
 }:
 
 buildPythonPackage rec {
   pname = "sigstore-protobuf-specs";
-  version = "0.3.5";
+  version = "0.3.2";
   pyproject = true;
 
   disabled = pythonOlder "3.8";
@@ -17,12 +18,15 @@ buildPythonPackage rec {
   src = fetchPypi {
     pname = "sigstore_protobuf_specs";
     inherit version;
-    hash = "sha256-yl0XAXrefexbuaABweDkXa5G+L2lk+j6sG6mjurBzpw=";
+    hash = "sha256-yuBBtAUCYAuKYz9DwldpXQIiqU76HlEQp+x62njDnZk=";
   };
 
   nativeBuildInputs = [ flit-core ];
 
-  propagatedBuildInputs = [ betterproto ];
+  propagatedBuildInputs = [
+    betterproto
+    pydantic
+  ];
 
   # Module has no tests
   doCheck = false;