diff --git a/.envrc b/.envrc
index 4ef3088..3550a30 100644
--- a/.envrc
+++ b/.envrc
@@ -1,8 +1 @@
 use flake
-
-nix build nixpkgs#dbip-city-lite --no-link
-nix build nixpkgs#dbip-asn-lite --no-link
-
-export IP_CHECKER_CITY_DB=$(nix eval nixpkgs#dbip-city-lite.mmdb --raw)
-export IP_CHECKER_ASN_DB=$(nix eval nixpkgs#dbip-asn-lite.mmdb --raw)
-export IP_CHECKER_MODE=dev
diff --git a/flake.lock b/flake.lock
index 7eafe56..539e40c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -22,11 +22,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1729265718,
-        "narHash": "sha256-4HQI+6LsO3kpWTYuVGIzhJs1cetFcwT7quWCk/6rqeo=",
+        "lastModified": 1730272153,
+        "narHash": "sha256-B5WRZYsRlJgwVHIV6DvidFN7VX7Fg9uuwkRW9Ha8z+w=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ccc0c2126893dd20963580b6478d1a10a4512185",
+        "rev": "2d2a9ddbe3f2c00747398f3dc9b05f7f2ebb0f53",
         "type": "github"
       },
       "original": {
@@ -66,11 +66,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1729242555,
-        "narHash": "sha256-6jWSWxv2crIXmYSEb3LEVsFkCkyVHNllk61X4uhqfCs=",
+        "lastModified": 1730321837,
+        "narHash": "sha256-vK+a09qq19QNu2MlLcvN4qcRctJbqWkX7ahgPZ/+maI=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "d986489c1c757f6921a48c1439f19bfb9b8ecab5",
+        "rev": "746901bb8dba96d154b66492a29f5db0693dbfcc",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index cb88700..3196942 100644
--- a/flake.nix
+++ b/flake.nix
@@ -38,13 +38,18 @@
         checks.formatting = treefmtEval.config.build.check inputs.self;
 
         ### nix develop
-        devShells.default = pkgs.mkShell {
+        devShells.default = pkgs.mkShellNoCC {
           nativeBuildInputs = with pkgs; [
             go
             nodePackages.prettier
             nodejs
             pnpm
           ];
+          shellHook = ''
+            export IP_CHECKER_CITY_DB=${pkgs.dbip-city-lite.mmdb}
+            export IP_CHECKER_ASN_DB=${pkgs.dbip-asn-lite.mmdb}
+            export IP_CHECKER_MODE=dev
+          '';
         };
       }
     );