diff --git a/pkgs/by-name/ma/matrix-authentication-service/package.nix b/pkgs/by-name/ma/matrix-authentication-service/package.nix
index 5b760c56988a..fe5b7414bb8c 100644
--- a/pkgs/by-name/ma/matrix-authentication-service/package.nix
+++ b/pkgs/by-name/ma/matrix-authentication-service/package.nix
@@ -26,7 +26,8 @@ rustPlatform.buildRustPackage rec {
     hash = "sha256-rFex6stw++xNrcCYnYn3N0HrUQd91DAw9QU0R2MUzyQ=";
   };
 
-  cargoHash = "sha256-0RqCgIiH7O4bAuzy1To0+8wfvZWnZ8irZNSCthaKqAk=";
+  useFetchCargoVendor = true;
+  cargoHash = "sha256-u3C6JmaPU4/pyg8Ko01Y33UkuqrVa2lV/jYdMUAF6ng=";
 
   npmDeps = fetchNpmDeps {
     name = "${pname}-${version}-npm-deps";
diff --git a/pkgs/development/python-modules/pylance/default.nix b/pkgs/development/python-modules/pylance/default.nix
index 2d38ee11e4c8..625757052c61 100644
--- a/pkgs/development/python-modules/pylance/default.nix
+++ b/pkgs/development/python-modules/pylance/default.nix
@@ -48,14 +48,14 @@ buildPythonPackage rec {
 
   sourceRoot = "${src.name}/python";
 
-  cargoDeps = rustPlatform.fetchCargoTarball {
+  cargoDeps = rustPlatform.fetchCargoVendor {
     inherit
       pname
       version
       src
       sourceRoot
       ;
-    hash = "sha256-WzgOQgD1dbpi/WR6LPbPVaYv11DF/sjeSUPVLVCchzI=";
+    hash = "sha256-D9+rKV4rF5AVMxFfEohHufHC2mO75M80TuZaHDI0XMU=";
   };
 
   nativeBuildInputs = [