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diff --git a/pkgs/development/python-modules/json-stream-rs-tokenizer/default.nix b/pkgs/development/python-modules/json-stream-rs-tokenizer/default.nix
index 86473e609bfe2a..8570e03bdc1bae 100644
--- a/pkgs/development/python-modules/json-stream-rs-tokenizer/default.nix
+++ b/pkgs/development/python-modules/json-stream-rs-tokenizer/default.nix
@@ -29,11 +29,9 @@ buildPythonPackage rec {
     hash = "sha256-ogX0KsfHRQW7+exRMKGwJiNINrOKPiTKxAqiTZyEWrg=";
   };
 
-  cargoDeps = rustPlatform.importCargoLock {
-    lockFile = ./Cargo.lock;
-    outputHashes = {
-      "utf8-read-0.4.0" = "sha256-L/NcgbB+2Rwtc+1e39fQh1D9S4RqQY6CCFOTh8CI8Ts=";
-    };
+  cargoDeps = rustPlatform.fetchCargoVendor {
+    inherit pname version src;
+    hash = "sha256-R5YPb0Cj+q17PjDF6U4IAt+/DUGQZdyI7Ij76oBVVLQ=";
   };
 
   nativeBuildInputs = [