diff --git a/overlays/kiwix-tools.nix b/overlays/kiwix-tools.nix
index 46f3934..0f14137 100644
--- a/overlays/kiwix-tools.nix
+++ b/overlays/kiwix-tools.nix
@@ -13,7 +13,7 @@
 
 stdenv.mkDerivation rec {
 	pname = "kiwix-tools";
-	version = "3.1.2";
+	version = "3.4.0";
 
 	src = pkgs.fetchFromGitHub {
 		owner = "kiwix";
diff --git a/overlays/libkiwix.nix b/overlays/libkiwix.nix
index ce7f6a7..ba2dbd3 100644
--- a/overlays/libkiwix.nix
+++ b/overlays/libkiwix.nix
@@ -18,7 +18,7 @@
 
 stdenv.mkDerivation rec {
 	pname = "libkiwix";
-	version = "9.4.1";
+	version = "12.0.0";
 
 	src = pkgs.fetchFromGitHub {
 		owner = "kiwix";