diff --git a/js/CHANGELOG.md b/js/CHANGELOG.md
index c92f75a..7f1f908 100644
--- a/js/CHANGELOG.md
+++ b/js/CHANGELOG.md
@@ -1,3 +1,6 @@
+4.0.1
+* fix iife build via esbuild configuration for fflate browser dependency
+
 4.0.0
 * remove pmtiles spec v2 support, which reduces bundle size significantly [#287]
 * use tsup for creating cjs/esm packages, which fixes typescript usage [#498]
diff --git a/js/examples/leaflet.html b/js/examples/leaflet.html
index f5e2a68..bbdc8c1 100644
--- a/js/examples/leaflet.html
+++ b/js/examples/leaflet.html
@@ -4,7 +4,7 @@
         <meta charset="utf-8"/>
         <link rel="stylesheet" href="https://unpkg.com/leaflet@1.9.0/dist/leaflet.css" />
         <script src="https://unpkg.com/leaflet@1.9.0/dist/leaflet.js"></script>
-        <script src="https://unpkg.com/pmtiles@4.0.0/dist/pmtiles.js"></script>
+        <script src="https://unpkg.com/pmtiles@4.0.1/dist/pmtiles.js"></script>
         <style>
             body, #map {
                 height:100vh;
diff --git a/js/examples/maplibre.html b/js/examples/maplibre.html
index 1cb2167..1800300 100644
--- a/js/examples/maplibre.html
+++ b/js/examples/maplibre.html
@@ -4,7 +4,7 @@
         <meta charset="utf-8"/>
         <link rel="stylesheet" href="https://unpkg.com/maplibre-gl@4.7.0/dist/maplibre-gl.css" crossorigin="anonymous">
         <script src="https://unpkg.com/maplibre-gl@4.7.0/dist/maplibre-gl.js" crossorigin="anonymous"></script>
-        <script src="https://unpkg.com/pmtiles@4.0.0/dist/pmtiles.js"></script>
+        <script src="https://unpkg.com/pmtiles@4.0.1/dist/pmtiles.js"></script>
         <style>
             body {
                 margin: 0;
diff --git a/js/examples/maplibre_headers.html b/js/examples/maplibre_headers.html
index e42ec2f..019bef8 100644
--- a/js/examples/maplibre_headers.html
+++ b/js/examples/maplibre_headers.html
@@ -4,7 +4,7 @@
         <meta charset="utf-8"/>
         <link rel="stylesheet" href="https://unpkg.com/maplibre-gl@4.7.0/dist/maplibre-gl.css" crossorigin="anonymous">
         <script src="https://unpkg.com/maplibre-gl@4.7.0/dist/maplibre-gl.js" crossorigin="anonymous"></script>
-        <script src="https://unpkg.com/pmtiles@4.0.0/dist/pmtiles.js"></script>
+        <script src="https://unpkg.com/pmtiles@4.0.1/dist/pmtiles.js"></script>
         <style>
             body {
                 margin: 0;
diff --git a/js/examples/maplibre_raster_dem.html b/js/examples/maplibre_raster_dem.html
index defe0ae..245e28d 100644
--- a/js/examples/maplibre_raster_dem.html
+++ b/js/examples/maplibre_raster_dem.html
@@ -4,7 +4,7 @@
         <meta charset="utf-8"/>
         <link rel="stylesheet" href="https://unpkg.com/maplibre-gl@4.7.0/dist/maplibre-gl.css" crossorigin="anonymous">
         <script src="https://unpkg.com/maplibre-gl@4.7.0/dist/maplibre-gl.js" crossorigin="anonymous"></script>
-        <script src="https://unpkg.com/pmtiles@4.0.0/dist/pmtiles.js"></script>
+        <script src="https://unpkg.com/pmtiles@4.0.1/dist/pmtiles.js"></script>
         <style>
             body {
                 margin: 0;
diff --git a/js/package-lock.json b/js/package-lock.json
index 470a34a..97d73c2 100644
--- a/js/package-lock.json
+++ b/js/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "pmtiles",
-  "version": "3.2.1",
+  "version": "4.0.1",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "pmtiles",
-      "version": "3.2.1",
+      "version": "4.0.1",
       "license": "BSD-3-Clause",
       "dependencies": {
         "fflate": "^0.8.2"
@@ -15,7 +15,7 @@
         "@biomejs/biome": "^1.5.3",
         "@types/leaflet": "^1.9.8",
         "@types/node": "^20.0.0",
-        "esbuild": "^0.20.0",
+        "esbuild": "^0.24.0",
         "msw": "^2.5.0",
         "tsup": "^8.3.5",
         "tsx": "^4.7.0",
@@ -225,19 +225,20 @@
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     },
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+      "version": "0.24.0",
+      "resolved": "https://registry.npmjs.org/@esbuild/android-arm/-/android-arm-0.24.0.tgz",
+      "integrity": "sha512-arAtTPo76fJ/ICkXWetLCc9EwEHKaeya4vMrReVlEIUCAUncH7M4bhMQ+M9Vf+FFOZJdTNMXNBrWwW+OXWpSew==",
       "cpu": [
         "arm"
       ],
       "dev": true,
+      "license": "MIT",
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       ],
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-        "node": ">=12"
+        "node": ">=18"
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@@ -394,19 +395,20 @@
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       "cpu": [
         "loong64"
       ],
       "dev": true,
+      "license": "MIT",
       "optional": true,
       "os": [
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       ],
       "engines": {
-        "node": ">=12"
+        "node": ">=18"
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@@ -1462,377 +1464,43 @@
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       "dev": true,
       "hasInstallScript": true,
+      "license": "MIT",
       "bin": {
         "esbuild": "bin/esbuild"
       },
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-        "node": ">=12"
+        "node": ">=18"
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-          "resolved": "https://registry.npmjs.org/@esbuild/linux-loong64/-/linux-loong64-0.24.0.tgz",
-          "integrity": "sha512-0mswrYP/9ai+CU0BzBfPMZ8RVm3RGAN/lmOMgW4aFUSOQBjA31UP8Mr6DDhWSuMwj7jaWOT0p0WoZ6jeHhrD7g==",
-          "dev": true,
-          "optional": true
-        },
-        "esbuild": {
-          "version": "0.24.0",
-          "resolved": "https://registry.npmjs.org/esbuild/-/esbuild-0.24.0.tgz",
-          "integrity": "sha512-FuLPevChGDshgSicjisSooU0cemp/sGXR841D5LHMB7mTVOmsEHcAxaH3irL53+8YDIeVNQEySh4DaYU/iuPqQ==",
-          "dev": true,
-          "requires": {
-            "@esbuild/aix-ppc64": "0.24.0",
-            "@esbuild/android-arm": "0.24.0",
-            "@esbuild/android-arm64": "0.24.0",
-            "@esbuild/android-x64": "0.24.0",
-            "@esbuild/darwin-arm64": "0.24.0",
-            "@esbuild/darwin-x64": "0.24.0",
-            "@esbuild/freebsd-arm64": "0.24.0",
-            "@esbuild/freebsd-x64": "0.24.0",
-            "@esbuild/linux-arm": "0.24.0",
-            "@esbuild/linux-arm64": "0.24.0",
-            "@esbuild/linux-ia32": "0.24.0",
-            "@esbuild/linux-loong64": "0.24.0",
-            "@esbuild/linux-mips64el": "0.24.0",
-            "@esbuild/linux-ppc64": "0.24.0",
-            "@esbuild/linux-riscv64": "0.24.0",
-            "@esbuild/linux-s390x": "0.24.0",
-            "@esbuild/linux-x64": "0.24.0",
-            "@esbuild/netbsd-x64": "0.24.0",
-            "@esbuild/openbsd-arm64": "0.24.0",
-            "@esbuild/openbsd-x64": "0.24.0",
-            "@esbuild/sunos-x64": "0.24.0",
-            "@esbuild/win32-arm64": "0.24.0",
-            "@esbuild/win32-ia32": "0.24.0",
-            "@esbuild/win32-x64": "0.24.0"
-          }
-        }
       }
     },
     "tsx": {
diff --git a/js/package.json b/js/package.json
index e5a1fd2..8a13882 100644
--- a/js/package.json
+++ b/js/package.json
@@ -1,6 +1,6 @@
 {
   "name": "pmtiles",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "PMTiles archive decoder for browsers",
   "type": "module",
   "main": "dist/cjs/index.cjs",
@@ -38,7 +38,7 @@
     "@biomejs/biome": "^1.5.3",
     "@types/leaflet": "^1.9.8",
     "@types/node": "^20.0.0",
-    "esbuild": "^0.20.0",
+    "esbuild": "^0.24.0",
     "msw": "^2.5.0",
     "tsup": "^8.3.5",
     "tsx": "^4.7.0",
diff --git a/js/tsup.config.ts b/js/tsup.config.ts
index 3b4531d..9c9c903 100644
--- a/js/tsup.config.ts
+++ b/js/tsup.config.ts
@@ -29,6 +29,9 @@ export default [
   }),
   defineConfig({
     ...baseOptions,
+    esbuildOptions: (options) => {
+      options.platform = "browser";
+    },
     outDir: "dist",
     format: "iife",
     globalName: "pmtiles",