diff --git a/pkgs/bun/default.nix b/pkgs/bun/default.nix
deleted file mode 100644
index 02f19c58..00000000
--- a/pkgs/bun/default.nix
+++ /dev/null
@@ -1,11 +0,0 @@
-{ bun
-, fetchurl
-}:
-
-bun.overrideAttrs rec {
-  version = "1.2.16";
-  src = fetchurl {
-    url = "https://github.com/oven-sh/bun/releases/download/bun-v${version}/bun-linux-x64.zip";
-    hash = "sha256-+DEdjXyqDZOMbEzs8KYA5enOTidaQR44oun4x30MEAI=";
-  };
-}
diff --git a/pkgs/modules/bun/default.nix b/pkgs/modules/bun/default.nix
index 6a05c0ec..397a8c42 100644
--- a/pkgs/modules/bun/default.nix
+++ b/pkgs/modules/bun/default.nix
@@ -1,7 +1,14 @@
+# NOTE: Unlike Node.js, nixpkgs doesn't provide versioned bun attributes (e.g., bun_1_3).
+# This module uses pkgs.bun which tracks the latest version.
+#
+# When nixpkgs updates bun to a new major.minor version:
+# 1. Add the previous version to pkgs/historical-modules/default.nix, pinned to the
+#    commit before the nixpkgs update
+# 2. Update pkgs/upgrade-map/default.nix to chain the old version to the new one
+{ bun }:
 { pkgs, lib, ... }:
 
 let
-  bun = pkgs.callPackage ../../bun { };
   bun-wrapped = pkgs.lib.mkWrapper-replit_ld_library_path bun;
 
   extensions = [ ".js" ".jsx" ".cjs" ".mjs" ".ts" ".tsx" ".mts" ];
diff --git a/pkgs/modules/default.nix b/pkgs/modules/default.nix
index 45bfb25e..32263030 100644
--- a/pkgs/modules/default.nix
+++ b/pkgs/modules/default.nix
@@ -91,7 +91,9 @@ let
       nodejs = pkgs.nodejs_24;
     })
     (import ./bash)
-    (import ./bun)
+    (import ./bun {
+      bun = pkgs.bun;
+    })
     (import ./c)
     (import ./cpp)
     (import ./dart)
diff --git a/pkgs/modules/nodejs/default.nix b/pkgs/modules/nodejs/default.nix
index 9bd3a731..8b638247 100644
--- a/pkgs/modules/nodejs/default.nix
+++ b/pkgs/modules/nodejs/default.nix
@@ -6,7 +6,7 @@ let
 
   short-version = lib.versions.major nodejs.version;
 
-  bun = pkgs.callPackage ../../bun { };
+  bun = pkgs.bun;
 
   nodepkgs = pkgs.nodePackages.override {
     inherit nodejs;
diff --git a/pkgs/upgrade-map/default.nix b/pkgs/upgrade-map/default.nix
index c8c71945..1db5a6ad 100644
--- a/pkgs/upgrade-map/default.nix
+++ b/pkgs/upgrade-map/default.nix
@@ -10,6 +10,9 @@ let
     "bun-0.5" = "bun-0.6";
     "bun-0.6" = "bun-0.7";
     "bun-0.7" = "bun-1.0";
+    "bun-1.0" = "bun-1.1";
+    "bun-1.1" = "bun-1.2";
+    "bun-1.2" = "bun-1.3";
     "dart-3.0" = "dart-3.1";
     "dart-3.1" = "dart-3.2";
     "dart-3.2" = "dart-3.3";