diff --git a/.changeset/quiet-brooms-serve.md b/.changeset/quiet-brooms-serve.md
new file mode 100644
index 0000000000..1658b4f378
--- /dev/null
+++ b/.changeset/quiet-brooms-serve.md
@@ -0,0 +1,6 @@
+---
+"@pnpm/core": patch
+"pnpm": patch
+---
+
+Sort keys in `packageExtensions` before calculating `packageExtensionsChecksum`. Fix [#6824](https://github.com/pnpm/pnpm/issues/6824).
diff --git a/pkg-manager/core/package.json b/pkg-manager/core/package.json
index 5f97a86331..fafc0c4b72 100644
--- a/pkg-manager/core/package.json
+++ b/pkg-manager/core/package.json
@@ -67,6 +67,7 @@
     "ramda": "npm:@pnpm/ramda@0.28.1",
     "run-groups": "^3.0.1",
     "semver": "^7.5.4",
+    "sort-keys": "^4.2.0",
     "version-selector-type": "^3.0.0"
   },
   "devDependencies": {
diff --git a/pkg-manager/core/src/install/index.test.ts b/pkg-manager/core/src/install/index.test.ts
new file mode 100644
index 0000000000..16b7f7afd5
--- /dev/null
+++ b/pkg-manager/core/src/install/index.test.ts
@@ -0,0 +1,60 @@
+import { createObjectChecksum } from './index'
+
+function assets () {
+  const sorted = {
+    abc: {
+      a: 0,
+      b: [0, 1, 2],
+      c: null,
+    },
+    def: {
+      foo: 'bar',
+      hello: 'world',
+    },
+  } as const
+
+  const unsorted1 = {
+    abc: {
+      b: [0, 1, 2],
+      a: 0,
+      c: null,
+    },
+    def: {
+      hello: 'world',
+      foo: 'bar',
+    },
+  } as const
+
+  const unsorted2 = {
+    def: {
+      foo: 'bar',
+      hello: 'world',
+    },
+    abc: {
+      a: 0,
+      b: [0, 1, 2],
+      c: null,
+    },
+  } as const
+
+  const unsorted3 = {
+    def: {
+      hello: 'world',
+      foo: 'bar',
+    },
+    abc: {
+      b: [0, 1, 2],
+      a: 0,
+      c: null,
+    },
+  } as const
+
+  return { sorted, unsorted1, unsorted2, unsorted3 } as const
+}
+
+test('createObjectChecksum', () => {
+  const { sorted, unsorted1, unsorted2, unsorted3 } = assets()
+  expect(createObjectChecksum(unsorted1)).toBe(createObjectChecksum(sorted))
+  expect(createObjectChecksum(unsorted2)).toBe(createObjectChecksum(sorted))
+  expect(createObjectChecksum(unsorted3)).toBe(createObjectChecksum(sorted))
+})
diff --git a/pkg-manager/core/src/install/index.ts b/pkg-manager/core/src/install/index.ts
index a5a76cf044..d0a3055eb0 100644
--- a/pkg-manager/core/src/install/index.ts
+++ b/pkg-manager/core/src/install/index.ts
@@ -72,6 +72,7 @@ import pickBy from 'ramda/src/pickBy'
 import pipeWith from 'ramda/src/pipeWith'
 import props from 'ramda/src/props'
 import unnest from 'ramda/src/unnest'
+import sortKeys from 'sort-keys'
 import { parseWantedDependencies } from '../parseWantedDependencies'
 import { removeDeps } from '../uninstall/removeDeps'
 import { allProjectsAreUpToDate } from './allProjectsAreUpToDate'
@@ -749,8 +750,8 @@ function getOutdatedLockfileSetting (
   return null
 }
 
-export function createObjectChecksum (obj: unknown) {
-  const s = JSON.stringify(obj)
+export function createObjectChecksum (obj: Record<string, unknown>) {
+  const s = JSON.stringify(sortKeys(obj, { deep: true }))
   return crypto.createHash('md5').update(s).digest('hex')
 }
 
diff --git a/pkg-manager/core/test/install/packageExtensions.ts b/pkg-manager/core/test/install/packageExtensions.ts
index ddd58872c3..345085b9cf 100644
--- a/pkg-manager/core/test/install/packageExtensions.ts
+++ b/pkg-manager/core/test/install/packageExtensions.ts
@@ -1,7 +1,7 @@
 import { PnpmError } from '@pnpm/error'
 import { prepareEmpty } from '@pnpm/prepare'
-import { addDependenciesToPackage, mutateModulesInSingleProject } from '@pnpm/core'
-import { type PackageExtension } from '@pnpm/types'
+import { addDependenciesToPackage, mutateModulesInSingleProject, install } from '@pnpm/core'
+import { type PackageExtension, type ProjectManifest } from '@pnpm/types'
 import { createObjectChecksum } from '../../lib/install/index'
 import {
   testDefaults,
@@ -94,6 +94,58 @@ test('manifests are extended with fields specified by packageExtensions', async
   )
 })
 
+test('packageExtensionsChecksum does not change regardless of keys order', async () => {
+  const project = prepareEmpty()
+
+  const packageExtensions1: Record<string, PackageExtension> = {
+    'is-odd': {
+      peerDependencies: {
+        'is-number': '*',
+      },
+    },
+    'is-even': {
+      peerDependencies: {
+        'is-number': '*',
+      },
+    },
+  }
+
+  const packageExtensions2: Record<string, PackageExtension> = {
+    'is-even': {
+      peerDependencies: {
+        'is-number': '*',
+      },
+    },
+    'is-odd': {
+      peerDependencies: {
+        'is-number': '*',
+      },
+    },
+  }
+
+  const manifest = (): ProjectManifest => ({
+    dependencies: {
+      'is-even': '*',
+      'is-odd': '*',
+    },
+  })
+
+  await install(manifest(), await testDefaults({
+    packageExtensions: packageExtensions1,
+  }))
+  const lockfile1 = await project.readLockfile()
+  const checksum1 = lockfile1.packageExtensionsChecksum
+
+  await install(manifest(), await testDefaults({
+    packageExtensions: packageExtensions2,
+  }))
+  const lockfile2 = await project.readLockfile()
+  const checksum2 = lockfile2.packageExtensionsChecksum
+
+  expect(checksum1).toBe(checksum2)
+  expect(checksum1).not.toBeFalsy()
+})
+
 test('manifests are patched by extensions from the compatibility database', async () => {
   const project = prepareEmpty()
 
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 99c4eb6087..0fea7e747f 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -3000,6 +3000,9 @@ importers:
       semver:
         specifier: ^7.5.4
         version: 7.5.4
+      sort-keys:
+        specifier: ^4.2.0
+        version: 4.2.0
       version-selector-type:
         specifier: ^3.0.0
         version: 3.0.0