diff --git a/pkgs/development/libraries/tclap/default.nix b/pkgs/development/libraries/tclap/default.nix
index 451f17a2cd72..feb3825b3d4e 100644
--- a/pkgs/development/libraries/tclap/default.nix
+++ b/pkgs/development/libraries/tclap/default.nix
@@ -1,11 +1,11 @@
 { lib, stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  name = "tclap-1.2.2";
+  name = "tclap-1.2.3";
 
   src = fetchurl {
     url = "mirror://sourceforge/tclap/${name}.tar.gz";
-    sha256 = "0dsqvsgzam3mypj2ladn6v1yjq9zd47p3lg21jx6kz5azkkkn0gm";
+    sha256 = "sha256-GefbUoFUDxVDSHcLw6dIRXX09Umu+OAKq8yUs5X3c8k=";
   };
 
   meta = with lib; {