diff --git a/pkgs/by-name/op/opam2json/package.nix b/pkgs/by-name/op/opam2json/package.nix
index be0a3a05edf4..530d6f331a8a 100644
--- a/pkgs/by-name/op/opam2json/package.nix
+++ b/pkgs/by-name/op/opam2json/package.nix
@@ -7,19 +7,19 @@
 }:
 stdenv.mkDerivation (finalAttrs: {
   pname = "opam2json";
-  version = "0.4";
+  version = "0.5";
 
   src = fetchFromGitHub {
     owner = "tweag";
     repo = "opam2json";
     rev = "v${finalAttrs.version}";
-    sha256 = "sha256-5pXfbUfpVABtKbii6aaI2EdAZTjHJ2QntEf0QD2O5AM=";
+    sha256 = "sha256-rBGN9TERADPXiehNe1/9emO6QqYPrTwSoMdB+BVEWpM=";
   };
 
   buildInputs = with ocamlPackages; [
     yojson
     opam-file-format
-    cmdliner_1
+    cmdliner
   ];
   nativeBuildInputs = with ocamlPackages; [
     ocaml