diff --git a/pkgs/development/tools/knightos/scas/default.nix b/pkgs/development/tools/knightos/scas/default.nix
index 2269c3781a5..b87650d5bf9 100644
--- a/pkgs/development/tools/knightos/scas/default.nix
+++ b/pkgs/development/tools/knightos/scas/default.nix
@@ -1,26 +1,26 @@
 { fetchFromGitHub, stdenv, cmake }:
 
-
 stdenv.mkDerivation rec {
   pname = "scas";
 
-  version = "0.4.6";
+  version = "0.5.3";
 
   src = fetchFromGitHub {
     owner = "KnightOS";
     repo = "scas";
     rev = version;
-    sha256 = "1c6s9nivbwgv0f8n7j73h54ydgqw5dcpq8l752dfrnqg3kv3nn0h";
+    sha256 = "0z6r07cl92kq860ddas5p88l990ih9cfqlzy5y4mk5hrmjzya60j";
   };
 
-  nativeBuildInputs = [ cmake ];
+  cmakeFlags = [ "-DSCAS_LIBRARY=1" ];
 
-  hardeningDisable = [ "format" ];
+  nativeBuildInputs = [ cmake ];
 
   meta = with stdenv.lib; {
     homepage    = "https://knightos.org/";
     description = "Assembler and linker for the Z80";
     license     = licenses.mit;
     maintainers = with maintainers; [ siraben ];
+    platforms   = platforms.unix;
   };
 }
diff --git a/pkgs/development/tools/knightos/z80e/default.nix b/pkgs/development/tools/knightos/z80e/default.nix
index 6aad8f687e7..d8f6a127403 100644
--- a/pkgs/development/tools/knightos/z80e/default.nix
+++ b/pkgs/development/tools/knightos/z80e/default.nix
@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   pname = "z80e";
-  version = "0.5.0";
+  version = "0.5.2";
 
   src = fetchFromGitHub {
     owner = "KnightOS";
     repo = "z80e";
     rev = version;
-    sha256 = "18nnip6nv1pq19bxgd07fv7ci3c5yj8d9cip97a4zsfab7bmbq6k";
+    sha256 = "0gdv17ynjd6zf3i4hkimd89xkrd8kxas3bf8d5sq54fdicapvkzc";
   };
 
   nativeBuildInputs = [ cmake knightos-scas ];