diff --git a/flake.lock b/flake.lock
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1672308958,
-        "narHash": "sha256-zLvAJ+XTI7gIlUqlrKj8j4+POZXDB6kUOnV0yBvSIMc=",
+        "lastModified": 1757967192,
+        "narHash": "sha256-/aA9A/OBmnuOMgwfzdsXRusqzUpd8rQnQY8jtrHK+To=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "d879125d61a0be8ecb2afddaca8f2b0530db0260",
+        "rev": "0d7c15863b251a7a50265e57c1dca1a7add2e291",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
--- a/flake.nix
+++ b/flake.nix
@@ -5,7 +5,6 @@
     utils.url = "github:numtide/flake-utils";
     nixpkgs-unstable.url = "github:nixos/nixpkgs/nixpkgs-unstable";
     nixpkgs-grpc-web.url = "github:NixOS/nixpkgs/9957cd48326fe8dbd52fdc50dd2502307f188b0d";
-    # Do not update, used for EOL versions of mariaDB and arcanist+php8.0
     nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
   };
 
@@ -36,7 +35,6 @@
             # Re-introduce older packages that were removed in latest nixpkgs
             (_: _: {
               emscripten = oldNixpkgs.emscripten; # Changed signficantly
-              php80 = oldNixpkgs.php80; # Used for arcanist
             })
           ];
         };
diff --git a/nix/arcanist.nix b/nix/arcanist.nix
deleted file mode 100644
--- a/nix/arcanist.nix
+++ /dev/null
@@ -1,69 +0,0 @@
-{ stdenv
-, lib
-, cacert
-, fetchFromGitHub
-, installShellFiles
-, makeWrapper
-, php80
-, python3
-, which
-}:
-
-stdenv.mkDerivation {
-  pname = "arcanist";
-  version = "20220517";
-
-  src = fetchFromGitHub {
-    owner = "phacility";
-    repo = "arcanist";
-    rev = "85c953ebe4a6fef332158fd757d97c5a58682d3a";
-    sha256 = "0x847fw74mzrbhzpgc4iqgvs6dsf4svwfa707dsbxi78fn2lxbl7";
-  };
-
-  # These need to be in PATH during the build
-  nativeBuildInputs = [ php80 python3 installShellFiles makeWrapper ];
-
-  # Since we are exporting a script, we do not need to do an actual "build"
-  doBuild = false;
-
-  installPhase = ''
-    # Copy arcanist contents
-    mkdir -p $out/libexec $out/bin
-    cp -R . $out/libexec/arcanist
-
-    # provide a recent up-to-date certificate bundle for ssl
-    ln -sf ${cacert}/etc/ssl/certs/ca-bundle.crt \
-      $out/libexec/arcanist/resources/ssl/default.pem
-
-    # The canonical way to handle shebangs with nix is to use `patchShebangs`
-    # which will resolve to the absolute path of the interpreter.
-    # However, darwin will fail to interpret a shebang of 80 characters or
-    # longer for the first argument. Nix store paths hover around this limit.
-    # See https://github.com/NixOS/nixpkgs/issues/93609 for related issue.
-    cat << WRAPPER > $out/bin/arc
-    #!$shell -e
-    export PATH=${lib.makeBinPath [ python3 php80 which]}''${PATH:+':'}\$PATH
-    exec ${php80}/bin/php $out/libexec/arcanist/bin/arc "\$@"
-    WRAPPER
-
-    chmod +x $out/bin/arc
-
-    # Add shell completion for bash
-    $out/bin/arc shell-complete --generate --
-    installShellCompletion --cmd arc --bash \
-      $out/libexec/arcanist/support/shell/rules/bash-rules.sh
-  '';
-
-  # Ensure `arc` is able to run without failing
-  doInstallCheck = true;
-  installCheckPhase = ''
-    $out/bin/arc help diff -- > /dev/null
-  '';
-
-  meta = {
-    description = "Command line interface to Phabricator";
-    homepage = "http://phabricator.org";
-    license = lib.licenses.asl20;
-    platforms = lib.platforms.unix;
-  };
-}
diff --git a/nix/overlay.nix b/nix/overlay.nix
--- a/nix/overlay.nix
+++ b/nix/overlay.nix
@@ -13,8 +13,6 @@
   # add packages meant for just this repository
   amqp-cpp = prev.callPackage ./amqp-cpp.nix { };
 
-  arcanist = final.callPackage ./arcanist.nix { };
-
   better-prompt = prev.callPackage ./better-prompt.nix { };
 
   # c-ares is used to bootstrap curl, so cmake is not available in the default