diff --git a/pkgs/development/tools/rust/cargo-guppy/default.nix b/pkgs/development/tools/rust/cargo-guppy/default.nix
index 4596b93b32a1..e62a0a9925fd 100644
--- a/pkgs/development/tools/rust/cargo-guppy/default.nix
+++ b/pkgs/development/tools/rust/cargo-guppy/default.nix
@@ -9,16 +9,16 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "cargo-guppy";
-  version = "unstable-2023-07-29";
+  version = "unstable-2023-10-04";
 
   src = fetchFromGitHub {
     owner = "guppy-rs";
     repo = "guppy";
-    rev = "7c7f352d9d2dea1007b4475d4a76f86f061b6ba9";
-    sha256 = "sha256-H2vU7qax0P8Ulh1/DHnlmGRqSqzLuRy9TZOvikSLONw=";
+    rev = "837d0ae762b9ae79cc8ca5d629842e5ca34293b4";
+    sha256 = "sha256-LWU1yAD/f9w5m522vcKP9D2JusGkwzvfGSGstvFGUpk=";
   };
 
-  cargoSha256 = "sha256-lr7N/qqB1AwhNA+mbEAJFSp/rDxGp3qIGSKP9B3JAls=";
+  cargoSha256 = "sha256-IyU5fJSFzef8P5v8ILufGcTP3+5Gm0PH4Cox2G5saHw=";
 
   nativeBuildInputs = [ pkg-config ];
 
diff --git a/pkgs/development/tools/rust/cargo-hakari/default.nix b/pkgs/development/tools/rust/cargo-hakari/default.nix
index 842ea1a1915d..e58bf32863a8 100644
--- a/pkgs/development/tools/rust/cargo-hakari/default.nix
+++ b/pkgs/development/tools/rust/cargo-hakari/default.nix
@@ -2,16 +2,16 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "cargo-hakari";
-  version = "0.9.27";
+  version = "0.9.28";
 
   src = fetchFromGitHub {
     owner = "guppy-rs";
     repo = "guppy";
     rev = "cargo-hakari-${version}";
-    sha256 = "sha256-H2vU7qax0P8Ulh1/DHnlmGRqSqzLuRy9TZOvikSLONw=";
+    sha256 = "sha256-mTemccM/C9M2kso9PNpd0UGEZJd/tBd1PjCpbDFFtNo=";
   };
 
-  cargoHash = "sha256-fRaGtQc9CA5A6fQ1yj5zsg1Qv42yIi8ZlIcp4o5cNBU=";
+  cargoHash = "sha256-UaSW9PZMUhqjvRM0/URHaOfofG5Ap3bvKgAHa+H+MFw=";
 
   cargoBuildFlags = [ "-p" "cargo-hakari" ];
   cargoTestFlags = [ "-p" "cargo-hakari" ];