diff --git a/pkgs/tools/nix/alejandra/default.nix b/pkgs/tools/nix/alejandra/default.nix
index d1ad257568ff..6af7fd8bc611 100644
--- a/pkgs/tools/nix/alejandra/default.nix
+++ b/pkgs/tools/nix/alejandra/default.nix
@@ -7,16 +7,16 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "alejandra";
-  version = "0.3.1";
+  version = "0.4.0";
 
   src = fetchFromGitHub {
     owner = "kamadorueda";
     repo = "alejandra";
     rev = version;
-    sha256 = "sha256-IQ+hv/R6uRPEPr7+SRXyYol4/cQo1ZqcqJxy26CpOoY=";
+    sha256 = "sha256-vMfCEX0DqxT4yC4qPJEoAENUj0pHfsXnLaZaBfzYXJo=";
   };
 
-  cargoSha256 = "sha256-PIqdjtqbSVQoxLj5jGSbrzRQ3qddZvp1Y7tIuFs7UEg=";
+  cargoSha256 = "sha256-wsH9zsAYSuBeyyr8KBFOEMb0qlqC5cDAIoKgTaJA6eI=";
 
   passthru.tests = {
     version = testVersion { package = alejandra; };