diff --git a/flake.nix b/flake.nix
index fa5f73da..47d015a3 100644
--- a/flake.nix
+++ b/flake.nix
@@ -69,6 +69,8 @@
               pkg-config
               openssl
 
+              cargo-insta
+
               (pkgs.rust-bin.stable.latest.default.override {
                 extensions = [ "rust-src" "clippy" "rustfmt" ];
               })