diff --git a/nix/derivation.nix b/nix/derivation.nix
deleted file mode 100644
index 384b7b8..0000000
--- a/nix/derivation.nix
+++ /dev/null
@@ -1,63 +0,0 @@
-{
-  self,
-  stdenv,
-  lib,
-  rustPlatform,
-  pkg-config,
-  libiconv,
-  darwin,
-  lto ? false,
-  optimizeSize ? false,
-}:
-rustPlatform.buildRustPackage {
-  pname = "valfisk";
-  version = builtins.substring 0 8 self.lastModifiedDate;
-
-  src = lib.fileset.toSource {
-    root = ../.;
-    fileset = lib.fileset.unions [
-      ../src
-      ../build.rs
-      ../Cargo.lock
-      ../Cargo.toml
-    ];
-  };
-  cargoLock.lockFile = ../Cargo.lock;
-
-  __structuredAttrs = true;
-
-  buildInputs = lib.optionals stdenv.isDarwin [
-    libiconv
-    darwin.apple_sdk.frameworks.CoreFoundation
-    darwin.apple_sdk.frameworks.Security
-    darwin.apple_sdk.frameworks.SystemConfiguration
-  ];
-
-  nativeBuildInputs = [ pkg-config ];
-
-  doCheck = false;
-
-  env =
-    {
-      METADATA_LAST_MODIFIED = self.lastModified;
-      METADATA_GIT_REV = self.dirtyRev or self.rev;
-    }
-    // lib.optionalAttrs lto { CARGO_PROFILE_RELEASE_LTO = "fat"; }
-    // lib.optionalAttrs optimizeSize {
-      CARGO_PROFILE_RELEASE_OPT_LEVEL = "z";
-      CARGO_PROFILE_RELEASE_PANIC = "abort";
-      CARGO_PROFILE_RELEASE_CODEGEN_UNITS = "1";
-      CARGO_PROFILE_RELEASE_STRIP = "symbols";
-    };
-
-  meta = with lib; {
-    mainProgram = "valfisk";
-    description = "Next generation Ryanland Discord bot, written in Rust";
-    homepage = "https://github.com/ryanccn/valfisk";
-    maintainers = with maintainers; [
-      getchoo
-      ryanccn
-    ];
-    licenses = licenses.agpl3Only;
-  };
-}
diff --git a/nix/package.nix b/nix/package.nix
index f12b7d5..34892f8 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -9,9 +9,16 @@
   enableLTO ? true,
   enableOptimizeSize ? false,
 }:
+let
+  year = builtins.substring 0 4 self.lastModifiedDate;
+  month = builtins.substring 4 2 self.lastModifiedDate;
+  day = builtins.substring 6 2 self.lastModifiedDate;
+
+  formattedDate = "${year}-${month}-${day}";
+in
 rustPlatform.buildRustPackage rec {
   pname = passthru.cargoToml.package.name;
-  inherit (passthru.cargoToml.package) version;
+  version = passthru.cargoToml.package.version + "-unstable-" + formattedDate;
 
   strictDeps = true;
 
@@ -40,7 +47,11 @@ rustPlatform.buildRustPackage rec {
   nativeBuildInputs = lib.optionals stdenv.isDarwin [ pkg-config ];
 
   env =
-    lib.optionalAttrs enableLTO {
+    {
+      METADATA_LAST_MODIFIED = self.lastModified;
+      METADATA_GIT_REV = self.dirtyRev or self.rev;
+    }
+    // lib.optionalAttrs enableLTO {
       CARGO_PROFILE_RELEASE_LTO = "fat";
       CARGO_PROFILE_RELEASE_CODEGEN_UNITS = "1";
     }