diff --git a/pkgs/development/python-modules/thinc/default.nix b/pkgs/development/python-modules/thinc/default.nix
index 37115ac988aa..b577d4cbf2b2 100644
--- a/pkgs/development/python-modules/thinc/default.nix
+++ b/pkgs/development/python-modules/thinc/default.nix
@@ -22,12 +22,12 @@
 
 buildPythonPackage rec {
   pname = "thinc";
-  version = "9.1.1";
+  version = "8.3.6";
   pyproject = true;
 
   src = fetchPypi {
     inherit pname version;
-    hash = "sha256-IfrimG13d6bwULkEbcnqsRhS8cmpl9zJAy8+zCJ4Sko=";
+    hash = "sha256-SZg/m33cQ0OpUyaUqRGN0hbXpgBSCiGEmkO2wmjsbK0=";
   };
 
   build-system = [