diff --git a/pkgs/by-name/co/complgen/package.nix b/pkgs/by-name/co/complgen/package.nix
index 0965a7b60436..be86f61b4ef9 100644
--- a/pkgs/by-name/co/complgen/package.nix
+++ b/pkgs/by-name/co/complgen/package.nix
@@ -6,17 +6,17 @@
 
 rustPlatform.buildRustPackage rec {
   pname = "complgen";
-  version = "0.3.0";
+  version = "0.4.0";
 
   src = fetchFromGitHub {
     owner = "adaszko";
     repo = "complgen";
     rev = "v${version}";
-    hash = "sha256-spyRH3zzuuGZeQ8iFTa+hc/b4nYSiNIMOEWmc8+jJO0=";
+    hash = "sha256-RSNOpe2VCNw9TJGD7QuuZT9WOdA6AFFcF9AOg4/+94w=";
   };
 
   useFetchCargoVendor = true;
-  cargoHash = "sha256-mLWgMoP1Is2Tm1Ygwn9VR99GjTthAY30IGmKA29nR/w=";
+  cargoHash = "sha256-0e3PTetpWjagBuagfkdsNfn1k+rEbzOJJONMXv7G96o=";
 
   meta = with lib; {
     description = "Generate {bash,fish,zsh} completions from a single EBNF-like grammar";