diff --git a/README.md b/README.md
index 0c3e0b5..f4f8bde 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,6 @@ Yet another [JSX](https://facebook.github.io/jsx/) pragma for [Snabbdom](https:/
 ## Features
 
 - Straightforward and intuitive syntax: `<input type="text" />` rather than `<input props={{ type: 'text' }}>`
-- Supports recent major versions of Snabbdom
 - Attributes on intrinsic elements are typechecked (only for HTML elements for now)
 - `className` and `id` will be the part of the `sel`
 - Type-safe custom modules via module augmentation
@@ -31,7 +30,7 @@ Note that the following packages are peer dependencies of this library, which ne
 | Package                                              | Version |
 | ---------------------------------------------------- | ------- |
 | [`csstype`](https://www.npmjs.com/package/csstype)   | `3`     |
-| [`snabbdom`](https://www.npmjs.com/package/snabbdom) | `*`     |
+| [`snabbdom`](https://www.npmjs.com/package/snabbdom) | `3`     |
 
 ### With [npm](https://www.npmjs.com/)
 
@@ -108,14 +107,6 @@ Make sure you are using TypeScript v4.1+ and add the following options to your `
 
 Then the `jsx` and the `jsxs` functions will automatically be imported.
 
-#### Using with older versions of Snabbdom
-
-If you are using Snabbdom older than v3, you also need to import the polyfill that provides the compatible type information. Add the following import statement to the entry point.
-
-```ts
-import '@herp-inc/snabbdom-jsx/polyfills/older-snabbdom';
-```
-
 ### With [Babel](https://babeljs.io/)
 
 Add [`@babel/plugin-transform-react-jsx`](https://www.npmjs.com/package/@babel/plugin-transform-react-jsx) to your `devDependencies`.
diff --git a/default.nix b/default.nix
index ba9d65d..aea9aa1 100644
--- a/default.nix
+++ b/default.nix
@@ -18,7 +18,7 @@ pkgs.stdenv.mkDerivation rec {
   buildPhase=''
     HOME=$TMP yarn install --frozen-lockfile
     yarn tsc --project ./tsconfig.build.json
-    cp -r jsx-runtime.d.ts jsx-runtime.js package.json polyfills README.md ./dist
+    cp -r jsx-runtime.d.ts jsx-runtime.js package.json README.md ./dist
     cd ./dist
     yarn pack
     cd ..
diff --git a/package.json b/package.json
index 9ee1201..702facd 100644
--- a/package.json
+++ b/package.json
@@ -12,8 +12,7 @@
   "typings": "index.d.ts",
   "exports": {
     ".": "./index.js",
-    "./jsx-runtime": "./jsx-runtime.js",
-    "./polyfills/older-snabbdom": "./polyfills/older-snabbdom.js"
+    "./jsx-runtime": "./jsx-runtime.js"
   },
   "sideEffects": false,
   "author": "HERP, Inc. dev team <dev@herp.co.jp>",
@@ -38,6 +37,6 @@
   },
   "peerDependencies": {
     "csstype": "3",
-    "snabbdom": "*"
+    "snabbdom": "3"
   }
 }
diff --git a/polyfills/older-snabbdom.d.ts b/polyfills/older-snabbdom.d.ts
deleted file mode 100644
index c89c996..0000000
--- a/polyfills/older-snabbdom.d.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-import type { Hooks as _Hooks } from 'snabbdom/hooks';
-import type { Attrs as _Attrs } from 'snabbdom/modules/attributes';
-import type { Classes as _Classes } from 'snabbdom/modules/class';
-import type { Dataset as _Dataset } from 'snabbdom/modules/dataset';
-import type { On as _On } from 'snabbdom/modules/eventlisteners';
-import type { Props as _Props } from 'snabbdom/modules/props';
-import type { VNodeStyle as _VNodeStyle } from 'snabbdom/modules/style';
-import type { Key as _Key, VNode as _VNode } from 'snabbdom/vnode';
-
-declare module 'snabbdom' {
-    export type Attrs = _Attrs;
-    export type Classes = _Classes;
-    export type Hooks = _Hooks;
-    export type Key = _Key;
-    export type Dataset = _Dataset;
-    export type On = _On;
-    export type Props = _Props;
-    export type VNodeStyle = _VNodeStyle;
-    export type VNode = _VNode;
-}
diff --git a/polyfills/older-snabbdom.js b/polyfills/older-snabbdom.js
deleted file mode 100644
index cb0ff5c..0000000
--- a/polyfills/older-snabbdom.js
+++ /dev/null
@@ -1 +0,0 @@
-export {};