diff --git a/default.nix b/default.nix
index 31a3442..9d5a3cf 100644
--- a/default.nix
+++ b/default.nix
@@ -3,8 +3,10 @@
 
 let
   inherit (pkgs) lib;
-  releases = builtins.fromJSON (lib.strings.fileContents ./sources.json);
-  mkDerivation = { url, version, sha256 }: pkgs.stdenv.mkDerivation {
+  sources = builtins.fromJSON (lib.strings.fileContents ./sources.json);
+
+  # mkBinaryInstall makes a derivation that installs Zig from a binary.
+  mkBinaryInstall = { url, version, sha256 }: pkgs.stdenv.mkDerivation {
     inherit version;
 
     pname = "zig";
@@ -20,13 +22,26 @@ let
       cp zig $out/bin/zig
     '';
   };
-in lib.attrsets.mapAttrs (k: v:
-  if k == "master" then
-    lib.attrsets.mapAttrs (k: v: (mkDerivation {
-      inherit (v.${system}) version url sha256;
-    })) v
-  else
-    mkDerivation {
-      inherit (v.${system}) version url sha256;
-    })
-  releases
+
+  # This determines the latest /released/ version.
+  latest = lib.lists.last (
+    builtins.sort
+      (x: y: (builtins.compareVersions x y) < 0)
+      (builtins.filter (x: x != "master") (builtins.attrNames sources))
+  );
+
+  # This is the full list of packages
+  packages = lib.attrsets.mapAttrs (k: v:
+    if k == "master" then
+      lib.attrsets.mapAttrs (k: v: (mkBinaryInstall {
+        inherit (v.${system}) version url sha256;
+      })) v
+    else
+      mkBinaryInstall {
+        inherit (v.${system}) version url sha256;
+      })
+      sources;
+in
+  # We want the packages but also add a "default" that just points to the
+  # latest released version.
+  packages // { "default" = packages.${latest}; }
diff --git a/flake.nix b/flake.nix
index d487bcf..1690d42 100644
--- a/flake.nix
+++ b/flake.nix
@@ -14,8 +14,9 @@
       let pkgs = nixpkgs.legacyPackages.${system};
       in rec {
         packages = import ./default.nix { inherit system pkgs; };
-        defaultPackage = packages."0.9.1";
-        apps.zig = flake-utils.lib.mkApp { drv = defaultPackage; };
-        defaultApp = apps.zig;
+        apps = rec {
+          default = apps.zig;
+          zig = flake-utils.lib.mkApp { drv = packages.default; };
+        };
       });
 }