diff --git a/pkgs/development/libraries/libplctag/default.nix b/pkgs/development/libraries/libplctag/default.nix
index de71d021d015..7a26cfe92705 100644
--- a/pkgs/development/libraries/libplctag/default.nix
+++ b/pkgs/development/libraries/libplctag/default.nix
@@ -6,13 +6,13 @@
 
 stdenv.mkDerivation rec {
   pname = "libplctag";
-  version = "2.5.5";
+  version = "2.5.6";
 
   src = fetchFromGitHub {
     owner = "libplctag";
     repo = "libplctag";
     rev = "v${version}";
-    sha256 = "sha256-eWtQaYUWZNQYQOUXnbUfjrtpoO6CnNJ8WjlowA49sG0=";
+    sha256 = "sha256-xrXgLdGY7pQ5m+X5kmkL6BRHJCxp7PYJuuowC+i2qxM=";
   };
 
   nativeBuildInputs = [ cmake ];