diff --git a/pkgs/by-name/al/alejandra/package.nix b/pkgs/by-name/al/alejandra/package.nix
index 0c39e55ecce1..d694755d2de5 100644
--- a/pkgs/by-name/al/alejandra/package.nix
+++ b/pkgs/by-name/al/alejandra/package.nix
@@ -8,17 +8,17 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "alejandra";
-  version = "3.1.0";
+  version = "4.0.0";
 
   src = fetchFromGitHub {
     owner = "kamadorueda";
     repo = "alejandra";
     rev = version;
-    hash = "sha256-g0SSfTWZ5mtMOpQic+eqq9sXMy1E/7yKxxfupZd9V4A=";
+    hash = "sha256-Oi1n2ncF4/AWeY6X55o2FddIRICokbciqFYK64XorYk=";
   };
 
   useFetchCargoVendor = true;
-  cargoHash = "sha256-17HoU0GcJlTP254RqFX4gZxEflwJGSbBULA/rg0paUc=";
+  cargoHash = "sha256-IX4xp8llB7USpS/SSQ9L8+17hQk5nkXFP8NgFKVLqKU=";
 
   passthru.tests = {
     version = testers.testVersion { package = alejandra; };