diff --git a/flake.nix b/flake.nix
index c4d76b2..83c4a95 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,7 +33,7 @@
 						filterDnas = filterByHolochainPackageType "dna";
 						filterHapps = filterByHolochainPackageType "happ";
 
-						rustZome = { crateCargoTomlPath, holochain, workspacePath, excludedCrates ? [] }: 
+						rustZome = { crateCargoToml, holochain, workspacePath, excludedCrates ? [] }: 
 							let 
 							  system = holochain.devShells.holonix.system;
 							  pkgs = import inputs.nixpkgs {
@@ -50,9 +50,9 @@
 
 							in
 								pkgs.callPackage ./nix/zome.nix {
-					        inherit craneLib crateCargoTomlPath excludedCrates workspacePath;
-					      };
-						sweettest = { holochain, dna, workspacePath, crateCargoTomlPath }: 
+					        inherit craneLib crateCargoToml excludedCrates workspacePath;
+								};
+						sweettest = { holochain, dna, workspacePath, crateCargoToml }: 
 						  let
 							  system = holochain.devShells.holonix.system;
 							  pkgs = import inputs.nixpkgs {
@@ -66,43 +66,29 @@
 							  };
 					      craneLib = inputs.crane.lib.${system}.overrideToolchain rustToolchain;
 							in pkgs.callPackage ./nix/sweettest.nix {
-								inherit holochain dna craneLib workspacePath crateCargoTomlPath;
+								inherit holochain dna craneLib workspacePath crateCargoToml;
 							};
-						dna = { holochain, dnaManifestPath ? null, dnaManifest ? null, zomes }: 
+						dna = { holochain, dnaManifest, zomes }: 
 							let 
 							  system = holochain.devShells.holonix.system;
 							  pkgs = import inputs.nixpkgs {
 							    inherit system;
 							    overlays = [ (import inputs.rust-overlay) ];
 							  };
-							  finalDnaManifest = if dnaManifestPath == null 
-								  then (if dnaManifest == null 
-										then builtins.throw "Either the dnaManifest or the dnaManifestPath need to be set" 
-										else pkgs.writeText "dna.yaml" dnaManifest
-									) 
-									else dnaManifestPath;
 							in
 								pkgs.callPackage ./nix/dna.nix {
-					        inherit zomes holochain;
-									dnaManifest = finalDnaManifest;
+					        inherit zomes holochain dnaManifest;
 					      };
-						happ = { holochain, happManifest ? null, happManifestPath ? null, dnas }: 
+						happ = { holochain, happManifest, dnas }: 
 							let 
 							  system = holochain.devShells.holonix.system;
 							  pkgs = import inputs.nixpkgs {
 							    inherit system;
 							    overlays = [ (import inputs.rust-overlay) ];
 							  };
-							  finalHappManifest = if happManifestPath == null 
-								  then (if happManifest == null 
-										then builtins.throw "Either the happManifest or the happManifestPath need to be set" 
-										else pkgs.writeText "happ.yaml" happManifest
-									) 
-									else happManifestPath;
 							in
 								pkgs.callPackage ./nix/happ.nix {
-					        inherit dnas holochain;
-									happManifest = finalHappManifest;
+					        inherit dnas holochain happManifest;
 					      };
 			      };
 				};
diff --git a/nix/fixture/dna.nix b/nix/fixture/dna.nix
index 331b75f..c6d8804 100644
--- a/nix/fixture/dna.nix
+++ b/nix/fixture/dna.nix
@@ -21,7 +21,7 @@
         in 
           {
             my_dna = inputs.hcUtils.outputs.lib.dna {
-              dnaManifestPath = ./dna.yaml;
+              dnaManifest = ./dna.yaml;
               inherit zomes;
               holochain = inputs'.holochain;
             };
diff --git a/nix/fixture/flake.lock b/nix/fixture/flake.lock
index cf6e30f..92d36fc 100644
--- a/nix/fixture/flake.lock
+++ b/nix/fixture/flake.lock
@@ -540,7 +540,7 @@
       },
       "locked": {
         "lastModified": 0,
-        "narHash": "sha256-Zlbt1e1r4wWPnBzUxxDsxi4D0ALi0RmCCi3AUFBwEfk=",
+        "narHash": "sha256-5o6y2S7AbOlr0aMfN28qT2gYcfS5Y+OxUcga3+3UyYQ=",
         "path": "../..",
         "type": "path"
       },
diff --git a/nix/fixture/happ.nix b/nix/fixture/happ.nix
index 298897c..3a149a7 100644
--- a/nix/fixture/happ.nix
+++ b/nix/fixture/happ.nix
@@ -15,7 +15,7 @@
     }: {
   	  packages = 
 	    let
-          happManifestPath = ./happ.yaml;
+          happManifest = ./happ.yaml;
           allDnas = inputs.hcUtils.lib.filterDnas self'.packages;
 				  dnas = {
           } // allDnas;
@@ -23,7 +23,7 @@
 	      {
 	        my_happ = inputs.hcUtils.outputs.lib.happ {
 	          holochain = inputs'.holochain;
-	          inherit dnas happManifestPath;
+	          inherit dnas happManifest;
 	        };
 	  	  };
   	};
diff --git a/nix/fixture/zome/zome.nix b/nix/fixture/zome/zome.nix
index a56fb0d..3c2a165 100644
--- a/nix/fixture/zome/zome.nix
+++ b/nix/fixture/zome/zome.nix
@@ -9,7 +9,7 @@
       packages.my_zome = inputs.hcUtils.outputs.lib.rustZome {
         workspacePath = rootPath;
         holochain = inputs'.holochain;
-				crateCargoTomlPath = ./Cargo.toml;
+				crateCargoToml = ./Cargo.toml;
       };
       checks.my_zome = inputs.hcUtils.outputs.lib.sweettest {
         workspacePath = rootPath;
@@ -35,9 +35,8 @@
             my_zome = self'.packages.my_zome;
           };
           holochain = inputs'.holochain;
-
         };
-        crateCargoTomlPath = ./Cargo.toml;
+        crateCargoToml = ./Cargo.toml;
       };
   	};
 }
diff --git a/nix/sweettest.nix b/nix/sweettest.nix
index 2176f6e..1dbc9b4 100644
--- a/nix/sweettest.nix
+++ b/nix/sweettest.nix
@@ -5,11 +5,11 @@
 	pkgs,
 	lib,
 	craneLib,
-	crateCargoTomlPath,
+	crateCargoToml,
 	...
 }: 
 let 
-	cargoToml = builtins.fromTOML (builtins.readFile crateCargoTomlPath);
+	cargoToml = builtins.fromTOML (builtins.readFile crateCargoToml);
   crate = cargoToml.package.name;
 	
   buildInputs = (with pkgs; [ openssl holochain.packages.opensslStatic sqlcipher ])
diff --git a/nix/zome.nix b/nix/zome.nix
index ade5035..d3fe013 100644
--- a/nix/zome.nix
+++ b/nix/zome.nix
@@ -4,14 +4,14 @@
 	binaryen,
   craneLib,
   workspacePath,
-	crateCargoTomlPath,
+	crateCargoToml,
 	excludedCrates
 }:
 
 let 
 	cargoExtraArgs = "--workspace ${if excludedCrates != null then builtins.concatStringsSep " " (builtins.map (excludedCrate: ''--exclude ${excludedCrate}'') excludedCrates) else ''''}";
 
-	cargoToml = builtins.fromTOML (builtins.readFile crateCargoTomlPath);
+	cargoToml = builtins.fromTOML (builtins.readFile crateCargoToml);
   crate = cargoToml.package.name;
 
 	commonArgs = {
@@ -27,7 +27,7 @@ let
 		version = "workspace";
 	});
 	wasm = craneLib.buildPackage (commonArgs // {
-		cargoToml = crateCargoTomlPath;
+		cargoToml = crateCargoToml;
 		cargoLock = workspacePath + /Cargo.lock;
 		cargoArtifacts = wasmDeps;
 		cargoExtraArgs = "-p ${crate} --locked";