diff --git a/flake.lock b/flake.lock
index 91e7490..872ec9e 100644
--- a/flake.lock
+++ b/flake.lock
@@ -114,11 +114,11 @@
     },
     "flake-utils": {
       "locked": {
-        "lastModified": 1652776076,
-        "narHash": "sha256-gzTw/v1vj4dOVbpBSJX4J0DwUR6LIyXo7/SuuTJp1kM=",
+        "lastModified": 1653893745,
+        "narHash": "sha256-0jntwV3Z8//YwuOjzhV2sgJJPt+HY6KhU7VZUL0fKZQ=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "04c1b180862888302ddfb2e3ad9eaa63afc60cf8",
+        "rev": "1ed9fb1935d260de5fe1c2f7ee0ebaae17ed2fa1",
         "type": "github"
       },
       "original": {
@@ -250,6 +250,7 @@
         "effect": "effect",
         "elab-util": "elab-util",
         "flake-utils": [
+          "tap",
           "flake-utils"
         ],
         "frex": "frex",
@@ -266,6 +267,7 @@
         "katla": "katla",
         "lsp": "lsp",
         "nixpkgs": [
+          "tap",
           "nixpkgs"
         ],
         "odf": "odf",
@@ -485,9 +487,18 @@
     },
     "root": {
       "inputs": {
-        "flake-utils": "flake-utils",
-        "idris2-pkgs": "idris2-pkgs",
-        "nixpkgs": "nixpkgs",
+        "flake-utils": [
+          "tap",
+          "flake-utils"
+        ],
+        "idris2-pkgs": [
+          "tap",
+          "idris2-pkgs"
+        ],
+        "nixpkgs": [
+          "tap",
+          "nixpkgs"
+        ],
         "tap": "tap"
       }
     },
@@ -541,15 +552,9 @@
     },
     "tap": {
       "inputs": {
-        "flake-utils": [
-          "flake-utils"
-        ],
-        "idris2-pkgs": [
-          "idris2-pkgs"
-        ],
-        "nixpkgs": [
-          "nixpkgs"
-        ]
+        "flake-utils": "flake-utils",
+        "idris2-pkgs": "idris2-pkgs",
+        "nixpkgs": "nixpkgs"
       },
       "locked": {
         "lastModified": 1653664911,
diff --git a/flake.nix b/flake.nix
index 1aa4b62..008d6d8 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,57 +1,47 @@
 { description = "quox: quantitative extensional type theory";
 
   inputs = {
-    nixpkgs.url = "nixpkgs/21.11";
-
-    flake-utils = {
-      url = "github:numtide/flake-utils";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-
-    idris2-pkgs = {
-      url = "github:claymager/idris2-pkgs";
-      inputs.flake-utils.follows = "flake-utils";
-      inputs.nixpkgs.follows = "nixpkgs";
-    };
-
-    tap = {
-      url = "git+https://git.rhiannon.website/rhi/idris2-tap?ref=main";
-      inputs.nixpkgs.follows = "nixpkgs";
-      inputs.flake-utils.follows = "flake-utils";
-      inputs.idris2-pkgs.follows = "idris2-pkgs";
-    };
+    tap.url = "git+https://git.rhiannon.website/rhi/idris2-tap?ref=main";
+    nixpkgs.follows = "tap/nixpkgs";
+    flake-utils.follows = "tap/flake-utils";
+    idris2-pkgs.follows = "tap/idris2-pkgs";
   };
 
   outputs = { self, nixpkgs, idris2-pkgs, flake-utils, tap }:
-    let systems = with flake-utils.lib.system;
+    let
+      packagePaths = {
+        quox-lib   = ./lib;
+        quox       = ./exe;
+        quox-tests = ./tests;
+      };
+
+      extraDeps = [ tap ];
+
+      systems = with flake-utils.lib.system;
           [ x86_64-darwin x86_64-linux i686-linux ];
     in
+    with builtins;
     flake-utils.lib.eachSystem systems (system:
       let
-        pkgs = import nixpkgs {
+        basePkgs = import nixpkgs {
           inherit system;
           overlays = [ idris2-pkgs.overlay ];
         };
-        builders = pkgs.idris2-pkgs._builders;
+        builders = basePkgs.idris2-pkgs._builders;
 
-        testDeps = tap.packages.${system};
+        extraDepPkgs =
+          foldl' (acc: pkg: acc // pkg.packages.${system}) { } extraDeps;
+        mkPackage = name: path:
+          builders.idrisPackage path { extraPkgs = extraDepPkgs // packages; };
+        mkDevShell = _: pkg:
+          basePkgs.mkShell { buildInputs = [ (builders.devEnv pkg) ]; };
 
-        packages = let ipkg = builders.idrisPackage; in rec {
-          quox-lib   = ipkg ./lib   { };
-          quox       = ipkg ./exe   { extraPkgs = packages; };
-          quox-tests = ipkg ./tests { extraPkgs = packages // testDeps; };
-        };
-
-        devShells =
-          let mkDevShell = _: pkg:
-                pkgs.mkShell { buildInputs = [ (builders.devEnv pkg) ]; };
-              shells = packages // (with packages;
-                { exe = quox; lib = quox-lib; tests = quox-tests; });
-          in builtins.mapAttrs mkDevShell shells;
+        packages = mapAttrs mkPackage packagePaths;
+        devShells = mapAttrs mkDevShell packages;
       in {
         inherit packages devShells;
         defaultPackage = packages.quox;
-        devShell = devShells.lib;
+        devShell = devShells.quox-lib;
       }
     );
 }