diff --git a/.talismanrc b/.talismanrc
index 41223457..9131959e 100644
--- a/.talismanrc
+++ b/.talismanrc
@@ -6,4 +6,6 @@ fileignoreconfig:
   checksum: 9d0340f9359927d477fe8ab4650642c068c592be63fb817651d866849e0dbbc2
 - filename: .husky/pre-commit
   checksum: 5baabd7d2c391648163f9371f0e5e9484f8fb90fa2284cfc378732ec3192c193
+- filename: test/sanity-check/api/stack-test.js
+  checksum: 198d5cf7ead33b079249dc3ecdee61a9c57453e93f1073ed0341400983e5aa53
 version: ""
\ No newline at end of file
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 726e69b2..b638938a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,4 +1,8 @@
 # Changelog
+## [v1.21.3](https://github.com/contentstack/contentstack-management-javascript/tree/v1.21.3) (2025-05-26)
+ - Enhancement
+   - Update addSettings Method to Support Generic Stack Settings Update
+
 ## [v1.21.2](https://github.com/contentstack/contentstack-management-javascript/tree/v1.21.2) (2025-05-19)
  - Enhancement
    - Added preview token generation.
diff --git a/lib/stack/index.js b/lib/stack/index.js
index 3ced19ee..1a155902 100644
--- a/lib/stack/index.js
+++ b/lib/stack/index.js
@@ -633,10 +633,17 @@ export function Stack (http, data) {
      */
     this.addSettings = async (stackVariables = {}) => {
       try {
-        const response = await http.post(`${this.urlPath}/settings`, { stack_settings: { stack_variables: stackVariables } },
-          { headers: {
-            ...cloneDeep(this.stackHeaders)
-          } })
+        const payloadBody = (
+          'stack_variables' in stackVariables ||
+          'live_preview' in stackVariables ||
+          'rte' in stackVariables
+        )
+          ? { stack_settings: stackVariables }
+          : { stack_settings: { stack_variables: stackVariables } }
+
+        const response = await http.post(`${this.urlPath}/settings`, payloadBody, { headers: {
+          ...cloneDeep(this.stackHeaders)
+        } })
         if (response.data) {
           return response.data.stack_settings
         } else {
diff --git a/package-lock.json b/package-lock.json
index 82a6b51d..32aa93f5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@contentstack/management",
-  "version": "1.21.2",
+  "version": "1.21.3",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@contentstack/management",
-      "version": "1.21.2",
+      "version": "1.21.3",
       "license": "MIT",
       "dependencies": {
         "assert": "^2.1.0",
diff --git a/package.json b/package.json
index 0dba89bc..ad3a4082 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@contentstack/management",
-  "version": "1.21.2",
+  "version": "1.21.3",
   "description": "The Content Management API is used to manage the content of your Contentstack account",
   "main": "./dist/node/contentstack-management.js",
   "browser": "./dist/web/contentstack-management.js",
diff --git a/test/sanity-check/api/stack-test.js b/test/sanity-check/api/stack-test.js
index 76082f43..ce52ec83 100644
--- a/test/sanity-check/api/stack-test.js
+++ b/test/sanity-check/api/stack-test.js
@@ -91,7 +91,70 @@ describe('Stack api Test', () => {
       .catch(done)
   })
 
-  it('should add stack settings', done => {
+  it('should set stack_variables correctly', done => {
+    const variables = {
+      stack_variables: {
+        enforce_unique_urls: true,
+        sys_rte_allowed_tags: 'style,figure,script',
+        sys_rte_skip_format_on_paste: 'GD:font-size',
+        samplevariable: 'too'
+      }
+    }
+
+    client.stack({ api_key: stacks.api_key })
+      .addSettings(variables)
+      .then((response) => {
+        const vars = response.stack_variables
+        expect(vars.enforce_unique_urls).to.equal(true)
+        expect(vars.sys_rte_allowed_tags).to.equal('style,figure,script')
+        expect(vars.sys_rte_skip_format_on_paste).to.equal('GD:font-size')
+        expect(vars.samplevariable).to.equal('too')
+        done()
+      })
+      .catch(done)
+  })
+
+  it('should set rte settings correctly', done => {
+    const variables = {
+      rte: {
+        cs_breakline_on_enter: true,
+        cs_only_breakline: true
+      }
+    }
+
+    client.stack({ api_key: stacks.api_key })
+      .addSettings(variables)
+      .then((response) => {
+        const rte = response.rte
+        expect(rte.cs_breakline_on_enter).to.equal(true)
+        expect(rte.cs_only_breakline).to.equal(true)
+        done()
+      })
+      .catch(done)
+  })
+
+  it('should set live_preview settings correctly', done => {
+    const variables = {
+      live_preview: {
+        enabled: true,
+        'default-env': '',
+        'default-url': 'https://preview.example.com'
+      }
+    }
+
+    client.stack({ api_key: stacks.api_key })
+      .addSettings(variables)
+      .then((response) => {
+        const preview = response.live_preview
+        expect(preview.enabled).to.equal(true)
+        expect(preview['default-env']).to.equal('')
+        expect(preview['default-url']).to.equal('https://preview.example.com')
+        done()
+      })
+      .catch(done)
+  })
+
+  it('should add simple stack variable', done => {
     client.stack({ api_key: stacks.api_key })
       .addSettings({ samplevariable: 'too' })
       .then((response) => {
@@ -101,6 +164,47 @@ describe('Stack api Test', () => {
       .catch(done)
   })
 
+  it('should add stack settings', done => {
+    const variables = {
+      stack_variables: {
+        enforce_unique_urls: true,
+        sys_rte_allowed_tags: 'style,figure,script',
+        sys_rte_skip_format_on_paste: 'GD:font-size',
+        samplevariable: 'too'
+      },
+      rte: {
+        cs_breakline_on_enter: true,
+        cs_only_breakline: true
+      },
+      live_preview: {
+        enabled: true,
+        'default-env': '',
+        'default-url': 'https://preview.example.com'
+      }
+    }
+
+    client.stack({ api_key: stacks.api_key })
+      .addSettings(variables).then((response) => {
+        const vars = response.stack_variables
+        expect(vars.enforce_unique_urls).to.equal(true, 'enforce_unique_urls must be true')
+        expect(vars.sys_rte_allowed_tags).to.equal('style,figure,script', 'sys_rte_allowed_tags must match')
+        expect(vars.sys_rte_skip_format_on_paste).to.equal('GD:font-size', 'sys_rte_skip_format_on_paste must match')
+        expect(vars.samplevariable).to.equal('too', 'samplevariable must be "too"')
+
+        const rte = response.rte
+        expect(rte.cs_breakline_on_enter).to.equal(true, 'cs_breakline_on_enter must be true')
+        expect(rte.cs_only_breakline).to.equal(true, 'cs_only_breakline must be true')
+
+        const preview = response.live_preview
+        expect(preview.enabled).to.equal(true, 'live_preview.enabled must be true')
+        expect(preview['default-env']).to.equal('', 'default-env must match')
+        expect(preview['default-url']).to.equal('https://preview.example.com', 'default-url must match')
+
+        done()
+      })
+      .catch(done)
+  })
+
   it('should reset stack settings', done => {
     client.stack({ api_key: stacks.api_key })
       .resetSettings()