diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 5bcd95ae..51f1f43d 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -61,7 +61,9 @@ jobs:
           deno-version: v1.x
       - run: |
           deno --version
-          deno test --allow-read test/deno/yargs-test.ts
+          deno test --allow-read --allow-env test/deno/yargs-test.ts
+        env:
+          MY_PREFIX_MY_KEY: "my value"
   browser:
     runs-on: ubuntu-latest
     steps:
diff --git a/.github/workflows/release-please.yml b/.github/workflows/release-please.yml
index b068d68d..dccda7e8 100644
--- a/.github/workflows/release-please.yml
+++ b/.github/workflows/release-please.yml
@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: google-github-actions/release-please-action@v2
+      - uses: google-github-actions/release-please-action@v3
         id: release
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index 6b84c484..456110db 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1 +1 @@
-{".":"21.0.0"}
\ No newline at end of file
+{".":"21.0.1"}
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index f34e4dfd..ca50b82e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 All notable changes to this project will be documented in this file. See [standard-version](https://github.com/conventional-changelog/standard-version) for commit guidelines.
 
+### [21.0.1](https://github.com/yargs/yargs-parser/compare/yargs-parser-v21.0.0...yargs-parser-v21.0.1) (2022-02-27)
+
+
+### Bug Fixes
+
+* return deno env object ([#432](https://github.com/yargs/yargs-parser/issues/432)) ([b00eb87](https://github.com/yargs/yargs-parser/commit/b00eb87b4860a890dd2dab0d6058241bbfd2b3ec))
+
 ## [21.0.0](https://www.github.com/yargs/yargs-parser/compare/yargs-parser-v20.2.9...yargs-parser-v21.0.0) (2021-11-15)
 
 
diff --git a/deno.ts b/deno.ts
index 1074dc64..ea42bced 100644
--- a/deno.ts
+++ b/deno.ts
@@ -10,7 +10,7 @@ import type { Arguments, ArgsInput, Parser, Options, DetailedArguments } from '.
 const parser = new YargsParser({
   cwd: Deno.cwd,
   env: () => {
-    Deno.env.toObject()
+    return Deno.env.toObject()
   },
   format: (str: string, arg: string) => { return str.replace('%s', arg) },
   normalize: path.posix.normalize,
diff --git a/package.json b/package.json
index c4b03225..89412fcf 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "yargs-parser",
-  "version": "21.0.0",
+  "version": "21.0.1",
   "description": "the mighty option parser used by yargs",
   "main": "build/index.cjs",
   "exports": {
@@ -53,7 +53,6 @@
     "@types/node": "^16.11.4",
     "@typescript-eslint/eslint-plugin": "^3.10.1",
     "@typescript-eslint/parser": "^3.10.1",
-    "@wessberg/rollup-plugin-ts": "^1.2.28",
     "c8": "^7.3.0",
     "chai": "^4.2.0",
     "cross-env": "^7.0.2",
@@ -62,10 +61,11 @@
     "eslint-plugin-node": "^11.0.0",
     "gts": "^3.0.0",
     "mocha": "^9.0.0",
-    "puppeteer": "^11.0.0",
+    "puppeteer": "^13.4.0",
     "rimraf": "^3.0.2",
     "rollup": "^2.22.1",
     "rollup-plugin-cleanup": "^3.1.1",
+    "rollup-plugin-ts": "^2.0.5",
     "serve": "^13.0.0",
     "standardx": "^7.0.0",
     "start-server-and-test": "^1.11.2",
diff --git a/rollup.config.js b/rollup.config.js
index ff47101d..15fd65db 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,5 +1,5 @@
 import cleanup from 'rollup-plugin-cleanup'
-import ts from '@wessberg/rollup-plugin-ts'
+import ts from 'rollup-plugin-ts'
 import transformDefaultExport from 'ts-transform-default-export'
 
 const output = {
diff --git a/test/deno/yargs-test.ts b/test/deno/yargs-test.ts
index f025ac62..8bb250ec 100644
--- a/test/deno/yargs-test.ts
+++ b/test/deno/yargs-test.ts
@@ -63,3 +63,8 @@ Deno.test('it detects strings that could be parsed as numbers', () => {
   assertEquals(parser.looksLikeNumber('0100'), false)
   assertEquals(parser.looksLikeNumber('apple'), false)
 })
+
+Deno.test('should load values from environment variables', () => {
+  const argv = parser([], { envPrefix: 'MY_PREFIX_' })
+  assertEquals(argv.myKey, 'my value')
+})