diff --git a/flake.nix b/flake.nix
index ee9feee..c3702d6 100644
--- a/flake.nix
+++ b/flake.nix
@@ -11,24 +11,26 @@
       devShells."${system}".default =
         pkgs.mkShell { packages = [ pkgs.mkvtoolnix-cli ]; };
 
-      overlays.default = final: prev: {
-        subtitle-merge = final.rustPlatform.buildRustPackage {
-          name = "subtitle-merge";
-          version = "0.1";
-          src = ./.;
-          cargoLock.lockFile = ./Cargo.lock;
-          buildInputs = builtins.attrValues {
-            inherit (final) installShellFiles mkvtoolnix-cli;
-          };
+      overlays.default = final: prev:
+        let cargo-toml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+        in {
+          subtitle-merge = final.rustPlatform.buildRustPackage {
+            pname = cargo-toml.package.name;
+            version = cargo-toml.package.version;
+            src = ./.;
+            cargoLock.lockFile = ./Cargo.lock;
+            buildInputs = builtins.attrValues {
+              inherit (final) installShellFiles mkvtoolnix-cli;
+            };
 
-          postInstall = ''
-            installShellCompletion --cmd subtitle-merge \
-              --bash ./target/release-tmp/build/*/out/subtitle-merge.bash \
-              --fish ./target/release-tmp/build/*/out/subtitle-merge.fish \
-              --zsh ./target/release-tmp/build/*/out/_subtitle-merge
-          '';
+            postInstall = ''
+              installShellCompletion --cmd subtitle-merge \
+                --bash ./target/release-tmp/build/*/out/subtitle-merge.bash \
+                --fish ./target/release-tmp/build/*/out/subtitle-merge.fish \
+                --zsh ./target/release-tmp/build/*/out/_subtitle-merge
+            '';
+          };
         };
-      };
 
       packages."${system}" = rec {
         inherit (overlays.default pkgs pkgs) subtitle-merge;