diff --git a/README.md b/README.md
index 5f7cfc9..c125327 100644
--- a/README.md
+++ b/README.md
@@ -9,15 +9,6 @@ developers apply FSRS to their flashcard applications, there by improving the us
 npm install ts-fsrs
 ```
 
-# Environment Variables
-If you need to customize default parameters, you can modify the values using `.env`/`.env.local`/`.env.production`/`.env.development`.
-
-Copy the [.env.local.example](./example/.env.local.example) file in this directory to .env.local (which will be ignored by Git):
-
-```bash
-cp .env.local.example .env.local
-```
-
 # Example
 
 ```typescript
diff --git a/__tests__/models.test.ts b/__tests__/models.test.ts
index 688ac3b..539b8f7 100644
--- a/__tests__/models.test.ts
+++ b/__tests__/models.test.ts
@@ -1,5 +1,4 @@
 import {
-  envParams,
   Rating,
   RatingType,
   State,
@@ -77,30 +76,23 @@ describe("Rating", () => {
 });
 
 describe("default FSRSParameters", () => {
-  const env = envParams;
+  // const env = envParams;
   const params = generatorParameters();
   const w_v4 = [
     0.4, 0.6, 2.4, 5.8, 4.93, 0.94, 0.86, 0.01, 1.49, 0.14, 0.94, 2.18, 0.05,
     0.34, 1.26, 0.29, 2.61,
   ];
   it("default_request_retention", () => {
-    expect([0.9, env.FSRS_REQUEST_RETENTION]).toContainEqual(
-      params.request_retention,
-    );
+    expect(0.9).toEqual(params.request_retention);
   });
   it("default_maximum_interval", () => {
-    expect([36500, env.FSRS_MAXIMUM_INTERVAL]).toContainEqual(
-      params.maximum_interval,
-    );
+    expect(36500).toEqual(params.maximum_interval);
   });
   it("default_w ", () => {
-    expect([w_v4, env.FSRS_W]).toContainEqual(params.w);
-    if (env.FSRS_W) {
-      expect(env.FSRS_W.length).toEqual(w_v4.length);
-    }
+    expect(w_v4).toEqual(params.w);
   });
   it("default_enable_fuzz ", () => {
-    expect([false, env.FSRS_ENABLE_FUZZ]).toContainEqual(params.enable_fuzz);
+    expect(false).toEqual(params.enable_fuzz);
   });
 });
 
diff --git a/example/.env.local.example b/example/.env.local.example
deleted file mode 100644
index 0f17ba4..0000000
--- a/example/.env.local.example
+++ /dev/null
@@ -1,4 +0,0 @@
-FSRS_REQUEST_RETENTION=0.8
-FSRS_MAXIMUM_INTERVAL=36500
-FSRS_W='[0.4, 0.6, 2.4, 5.8, 4.93, 0.94, 0.86, 0.01, 1.49, 0.14, 0.94, 2.18, 0.05, 0.34, 1.26, 0.29, 2.61]'
-FSRS_ENABLE_FUZZ=true
\ No newline at end of file
diff --git a/package.json b/package.json
index d5d14c4..1146822 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ts-fsrs",
-  "version": "3.1.0-beta6",
+  "version": "3.1.0-beta7",
   "description": "ts-fsrs is a TypeScript package used to implement the Free Spaced Repetition Scheduler (FSRS) algorithm. It helps developers apply FSRS to their flashcard applications, thereby improving the user learning experience.",
   "main": "dist/ts-fsrs.js",
   "module": "dist/ts-fsrs.mjs",
@@ -13,7 +13,6 @@
     "FSRS"
   ],
   "dependencies": {
-    "dotenv": "^16.3.1",
     "seedrandom": "^3.0.5"
   },
   "devDependencies": {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 950063d..98c5208 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -5,9 +5,6 @@ settings:
   excludeLinksFromLockfile: false
 
 dependencies:
-  dotenv:
-    specifier: ^16.3.1
-    version: 16.3.1
   seedrandom:
     specifier: ^3.0.5
     version: 3.0.5
@@ -2546,11 +2543,6 @@ packages:
       esutils: 2.0.3
     dev: true
 
-  /dotenv@16.3.1:
-    resolution: {integrity: sha512-IPzF4w4/Rd94bA9imS68tZBaYyBWSCE47V1RGuMrB94iyTOIEwRmVL2x/4An+6mETpLrKJ5hQkB8W4kFAadeIQ==}
-    engines: {node: '>=12'}
-    dev: false
-
   /eastasianwidth@0.2.0:
     resolution: {integrity: sha512-I88TYZWc9XiYHRQ4/3c5rjjfgkjhLyW2luGIheGERbNQ6OY7yTybanSpDXZa8y7VUP9YmDcYa+eyq4ca7iLqWA==}
     dev: true
diff --git a/src/fsrs/default.ts b/src/fsrs/default.ts
index 6718c5b..d6ced4d 100644
--- a/src/fsrs/default.ts
+++ b/src/fsrs/default.ts
@@ -1,40 +1,15 @@
 import { Card, DateInput, FSRSParameters, State } from "./models";
 import { fixDate } from "./help";
-import { EnvParams } from "./type";
-import dotenv from "dotenv";
 
-if (typeof window === "undefined") {
-  dotenv.config({ path: `./.env.local` });
-  dotenv.config({ path: `./.env.production` });
-  dotenv.config({ path: `./.env.` });
-  dotenv.config({ path: `./.env.development` });
-}
-
-export const envParams: EnvParams = {
-  FSRS_REQUEST_RETENTION: Number(process && process.env.FSRS_REQUEST_RETENTION),
-  FSRS_MAXIMUM_INTERVAL: Number(process && process.env.FSRS_MAXIMUM_INTERVAL),
-  FSRS_W:
-    process && process.env.FSRS_W
-      ? JSON.parse(process.env.FSRS_W as string)
-      : undefined,
-  FSRS_ENABLE_FUZZ: Boolean(process && process.env.FSRS_ENABLE_FUZZ),
-};
-
-export const default_request_retention = !isNaN(
-  envParams.FSRS_REQUEST_RETENTION,
-)
-  ? envParams.FSRS_REQUEST_RETENTION
-  : 0.9;
-export const default_maximum_interval = !isNaN(envParams.FSRS_MAXIMUM_INTERVAL)
-  ? envParams.FSRS_MAXIMUM_INTERVAL
-  : 36500;
-export const default_w = envParams.FSRS_W || [
+export const default_request_retention = 0.9;
+export const default_maximum_interval = 36500;
+export const default_w = [
   0.4, 0.6, 2.4, 5.8, 4.93, 0.94, 0.86, 0.01, 1.49, 0.14, 0.94, 2.18, 0.05,
   0.34, 1.26, 0.29, 2.61,
 ];
-export const default_enable_fuzz = envParams.FSRS_ENABLE_FUZZ || false;
+export const default_enable_fuzz = false;
 
-export const FSRSVersion: string = "3.1.0-beta6";
+export const FSRSVersion: string = "3.1.0-beta7";
 
 export const generatorParameters = (
   props?: Partial<FSRSParameters>,
diff --git a/src/fsrs/index.ts b/src/fsrs/index.ts
index d578a5d..abb5411 100644
--- a/src/fsrs/index.ts
+++ b/src/fsrs/index.ts
@@ -6,8 +6,7 @@ export {
   default_enable_fuzz,
   FSRSVersion,
   generatorParameters,
-  createEmptyCard,
-  envParams
+  createEmptyCard
 } from "./default";
 export {
   date_scheduler,
diff --git a/src/fsrs/type.ts b/src/fsrs/type.ts
index 1d53154..4aced0a 100644
--- a/src/fsrs/type.ts
+++ b/src/fsrs/type.ts
@@ -1,10 +1,3 @@
 export type unit = "days" | "minutes";
 export type int = number & { __int__: void };
 export type double = number & { __double__: void };
-
-export interface EnvParams{
-    FSRS_REQUEST_RETENTION:number,
-    FSRS_MAXIMUM_INTERVAL:number,
-    FSRS_W?:number[],
-    FSRS_ENABLE_FUZZ?:boolean
-}
\ No newline at end of file