diff --git a/pkgs/by-name/cd/cdecl/package.nix b/pkgs/by-name/cd/cdecl/package.nix
index c500e095d1f2..07a265629942 100644
--- a/pkgs/by-name/cd/cdecl/package.nix
+++ b/pkgs/by-name/cd/cdecl/package.nix
@@ -11,13 +11,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "cdecl";
-  version = "18.3";
+  version = "18.4.1";
 
   src = fetchFromGitHub {
     owner = "paul-j-lucas";
     repo = "cdecl";
     rev = "refs/tags/cdecl-${finalAttrs.version}";
-    hash = "sha256-w6n/7oAl6D7cBG/YIauhjFjHs+ygF3ugKWv0lgY1G9Q=";
+    hash = "sha256-GtNB55zFIpt6yYE3olC3yQr2RLsS9AMewzJKDcb67GM=";
   };
 
   strictDeps = true;