diff --git a/pkgs/by-name/ta/tacent/package.nix b/pkgs/by-name/ta/tacent/package.nix
index 602e62e1f6fc..00604d762118 100644
--- a/pkgs/by-name/ta/tacent/package.nix
+++ b/pkgs/by-name/ta/tacent/package.nix
@@ -3,23 +3,27 @@
   fetchFromGitHub,
   lib,
   ninja,
+  libx11,
+  libxcb,
   stdenv,
 }:
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "tacent";
-  version = "0.8.18";
+  version = "0.8.18-unstable-2025-10-12";
 
   src = fetchFromGitHub {
     owner = "bluescan";
     repo = "tacent";
-    tag = "v${finalAttrs.version}";
-    hash = "sha256-z8VuJS8OaVw5CeO/udvBEmcURKIy1oWVYUv6Ai8lTI8=";
+    rev = "13e08f388681e31a64b6d55c5a4667b7554e3e96";
+    hash = "sha256-zePiqdjS5y9OPpZfMiXjlV3vKjO/YN1xs7fQuNGjQMc=";
   };
 
   nativeBuildInputs = [
     cmake
     ninja
+    libx11
+    libxcb
   ];
 
   meta = {
diff --git a/pkgs/by-name/ta/tacentview/package.nix b/pkgs/by-name/ta/tacentview/package.nix
index 358b140573b3..2901b81e21f3 100644
--- a/pkgs/by-name/ta/tacentview/package.nix
+++ b/pkgs/by-name/ta/tacentview/package.nix
@@ -14,13 +14,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "tacentview";
-  version = "1.0.46";
+  version = "1.0.46-unstable-2025-10-12";
 
   src = fetchFromGitHub {
     owner = "bluescan";
     repo = "tacentview";
-    tag = "v${finalAttrs.version}";
-    hash = "sha256-d4A26p1hmkYEZ+h6kRbHHr4QmAc3PMe3qYdkeKIRGkU=";
+    rev = "51569b34ecd3dac9c40106b92deceb4b56feb5de";
+    hash = "sha256-SblGqUiwYg+Bk17H41R3ytG2SQH/YfrYskyZOi5QSIc=";
   };
 
   nativeBuildInputs = [