diff --git a/pkgs/by-name/te/termbook/bump-tendril.patch b/pkgs/by-name/te/termbook/bump-tendril.patch
deleted file mode 100644
index 0263bcf69077..000000000000
--- a/pkgs/by-name/te/termbook/bump-tendril.patch
+++ /dev/null
@@ -1,28 +0,0 @@
-diff --git a/Cargo.lock b/Cargo.lock
-index 73e86d7..68d37b7 100644
---- a/Cargo.lock
-+++ b/Cargo.lock
-@@ -507,9 +509,9 @@ checksum = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
- 
- [[package]]
- name = "futf"
--version = "0.1.4"
-+version = "0.1.5"
- source = "registry+https://github.com/rust-lang/crates.io-index"
--checksum = "7c9c1ce3fa9336301af935ab852c437817d14cd33690446569392e65170aac3b"
-+checksum = "df420e2e84819663797d1ec6544b13c5be84629e7bb00dc960d6917db2987843"
- dependencies = [
-  "mac",
-  "new_debug_unreachable",
-@@ -1964,9 +1966,9 @@ dependencies = [
- 
- [[package]]
- name = "tendril"
--version = "0.4.1"
-+version = "0.4.3"
- source = "registry+https://github.com/rust-lang/crates.io-index"
--checksum = "707feda9f2582d5d680d733e38755547a3e8fb471e7ba11452ecfd9ce93a5d3b"
-+checksum = "d24a120c5fc464a3458240ee02c299ebcb9d67b5249c8848b09d639dca8d7bb0"
- dependencies = [
-  "futf",
-  "mac",
diff --git a/pkgs/by-name/te/termbook/package.nix b/pkgs/by-name/te/termbook/package.nix
deleted file mode 100644
index f4ecd33b6bb6..000000000000
--- a/pkgs/by-name/te/termbook/package.nix
+++ /dev/null
@@ -1,58 +0,0 @@
-{
-  lib,
-  rustPlatform,
-  fetchFromGitHub,
-  installShellFiles,
-  pkg-config,
-  oniguruma,
-  stdenv,
-}:
-
-rustPlatform.buildRustPackage rec {
-  pname = "termbook-cli";
-  version = "1.4.6";
-
-  src = fetchFromGitHub {
-    owner = "Byron";
-    repo = "termbook";
-    rev = "v${version}";
-    sha256 = "Bo3DI0cMXIfP7ZVr8MAW/Tmv+4mEJBIQyLvRfVBDG8c=";
-  };
-
-  cargoPatches = [
-    # update dependencies to fix build failure caused by unaligned packed structs
-    # generated by running `cargo update tendril`
-    ./bump-tendril.patch
-  ];
-
-  cargoHash = "sha256-CVZpOaRXCSuU739Ef8ObLQBvry7C9iRWWnM+4ATufQA=";
-
-  nativeBuildInputs = [
-    installShellFiles
-    pkg-config
-  ];
-
-  buildInputs = [
-    oniguruma
-  ];
-
-  env = {
-    RUSTONIG_SYSTEM_LIBONIG = true;
-  };
-
-  postInstall = lib.optionalString (stdenv.buildPlatform.canExecute stdenv.hostPlatform) ''
-    installShellCompletion --cmd termbook \
-      --bash <($out/bin/termbook completions bash) \
-      --fish <($out/bin/termbook completions fish) \
-      --zsh <($out/bin/termbook completions zsh)
-  '';
-
-  meta = with lib; {
-    description = "Runner for `mdbooks` to keep your documentation tested";
-    mainProgram = "termbook";
-    homepage = "https://github.com/Byron/termbook/";
-    changelog = "https://github.com/Byron/termbook/blob/${src.rev}/CHANGELOG.md";
-    license = licenses.asl20;
-    maintainers = with maintainers; [ phaer ];
-  };
-}
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index ccfac491f87b..825d9a97ce0d 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -1555,6 +1555,7 @@ mapAliases {
   temurin-jre-bin-23 = throw "Temurin 23 has been removed as it has reached its end of life"; # Added 2025-11-04
   temurin-jre-bin-24 = throw "Temurin 24 has been removed as it has reached its end of life"; # Added 2025-10-04
   tepl = throw "'tepl' has been renamed to/replaced by 'libgedit-tepl'"; # Converted to throw 2025-10-27
+  termbook = throw "'termbook' has been removed because it is not maintained upstream and has insecure dependencies."; # Added 2025-12-01
   terminus-nerdfont = throw "'terminus-nerdfont' has been renamed to/replaced by 'nerd-fonts.terminess-ttf'"; # Converted to throw 2025-10-27
   testVersion = throw "'testVersion' has been renamed to/replaced by 'testers.testVersion'"; # Converted to throw 2025-10-27
   tet = throw "'tet' has been removed for lack of maintenance"; # Added 2025-10-12