diff --git a/flake.nix b/flake.nix
index 5f31d8d..3403601 100644
--- a/flake.nix
+++ b/flake.nix
@@ -41,7 +41,7 @@
 							    overlays = [ (import inputs.rust-overlay) ];
 							  };
 
-							  rustToolchain = pkgs.rust-bin.nightly.latest.minimal.override {
+							  rustToolchain = pkgs.rust-bin.nightly."2024-01-29".minimal.override {
 							    # Set the build targets supported by the toolchain,
 							    # wasm32-unknown-unknown is required for trunk.
 							    targets = [ "wasm32-unknown-unknown" ];
diff --git a/nix/fixture/Cargo.toml b/nix/fixture/Cargo.toml
index b276bc9..dd7a423 100644
--- a/nix/fixture/Cargo.toml
+++ b/nix/fixture/Cargo.toml
@@ -1,3 +1,5 @@
+cargo-features = ["trim-paths"]
+
 [workspace]
 members = ["zome"]
 resolver = "2"
@@ -7,3 +9,8 @@ hdi = "0.4.0-beta-dev"
 hdk = "0.3.0-beta-dev"
 holochain = "0.3.0-beta-dev"
 serde = "1"
+
+[profile.release]
+opt-level = "z"
+trim-paths = true
+remap-debuginfo = true
diff --git a/nix/fixture/flake.lock b/nix/fixture/flake.lock
index 1e35fa2..b8f83f5 100644
--- a/nix/fixture/flake.lock
+++ b/nix/fixture/flake.lock
@@ -540,7 +540,7 @@
       },
       "locked": {
         "lastModified": 0,
-        "narHash": "sha256-FH1OUOHfGfcviSpQwf4/vLw4VqazLa4m+iGozfwzNRc=",
+        "narHash": "sha256-ySoYxlwP6GAHADzlk9Z+VyswRq9zDdkmW3BQiw9kPhc=",
         "path": "../..",
         "type": "path"
       },
diff --git a/nix/zome.nix b/nix/zome.nix
index d3fe013..b8f96d9 100644
--- a/nix/zome.nix
+++ b/nix/zome.nix
@@ -19,6 +19,7 @@ let
 		doCheck = false;
 	  src = craneLib.cleanCargoSource (craneLib.path workspacePath);
 	  CARGO_BUILD_TARGET = "wasm32-unknown-unknown";
+		CARGO_BUILD_RUSTFLAGS = "";
 	};
 	
   wasmDeps = craneLib.buildDepsOnly (commonArgs // {