diff --git a/src/browser/Terminal.ts b/src/browser/Terminal.ts
index f8b8b3e4..115ccce7 100644
--- a/src/browser/Terminal.ts
+++ b/src/browser/Terminal.ts
@@ -53,6 +53,7 @@ import { Linkifier2 } from 'browser/Linkifier2';
 import { CoreBrowserService } from 'browser/services/CoreBrowserService';
 import { CoreTerminal } from 'common/CoreTerminal';
 import { ITerminalOptions as IInitializedTerminalOptions } from 'common/services/Services';
+import { css } from 'browser/Color';
 
 // Let it work inside Node.js for automated testing purposes.
 const document: Document = (typeof window !== 'undefined') ? window.document : null as any;
@@ -150,6 +151,7 @@ export class Terminal extends CoreTerminal implements ITerminal {
     this.register(this._inputHandler.onRequestWindowsOptionsReport(type => this._reportWindowsOptions(type)));
     this.register(forwardEvent(this._inputHandler.onCursorMove, this._onCursorMove));
     this.register(forwardEvent(this._inputHandler.onTitleChange, this._onTitleChange));
+    this.register(this._inputHandler.onAnsiColorChange((index, color) => this.changeAnsiColor(index, color)));
     this.register(forwardEvent(this._inputHandler.onA11yChar, this._onA11yCharEmitter));
     this.register(forwardEvent(this._inputHandler.onA11yTab, this._onA11yTabEmitter));
 
@@ -157,6 +159,21 @@ export class Terminal extends CoreTerminal implements ITerminal {
     this.register(this._bufferService.onResize(e => this._afterResize(e.cols, e.rows)));
   }
 
+  private changeAnsiColor(colorIndex: number, colorValue: string): void {
+    // colorValue = rgb:xx/yy/zz
+    const r = colorValue.substring(4, 6);
+    const g = colorValue.substring(7, 9);
+    const b = colorValue.substring(10, 12);
+    const color = `#${r}${g}${b}`;
+
+    //TODO: remove debug
+    console.log(`Change ANSI color[${colorIndex}]=${colorValue} (${color})`);
+
+    this._colorManager!.colors.ansi[colorIndex] = css.toColor(color);
+    this._renderService?.setColors(this._colorManager!.colors);
+    this.viewport?.onThemeChange(this._colorManager!.colors);
+  }
+
   public dispose(): void {
     if (this._isDisposed) {
       return;
diff --git a/src/common/InputHandler.ts b/src/common/InputHandler.ts
index dbf695e6..3dd0c11b 100644
--- a/src/common/InputHandler.ts
+++ b/src/common/InputHandler.ts
@@ -250,6 +250,8 @@ export class InputHandler extends Disposable implements IInputHandler {
   public get onScroll(): IEvent<number> { return this._onScroll.event; }
   private _onTitleChange = new EventEmitter<string>();
   public get onTitleChange(): IEvent<string> { return this._onTitleChange.event; }
+  private _onAnsiColorChange = new EventEmitter<number, string>();
+  public get onAnsiColorChange(): IEvent<number, string> { return this._onAnsiColorChange.event; }
 
   constructor(
     private readonly _bufferService: IBufferService,
@@ -372,6 +374,12 @@ export class InputHandler extends Disposable implements IInputHandler {
     this._parser.setOscHandler(2, new OscHandler((data: string) => this.setTitle(data)));
     //   3 - set property X in the form "prop=value"
     //   4 - Change Color Number
+    this._parser.setOscHandler(4, new OscHandler((data: string) => {
+      const ansiColor = data.split(';');
+      const colorIndex = parseInt(ansiColor[0]);
+      const colorValue = ansiColor[1];
+      this.setAnsiColor(colorIndex, colorValue);
+    }));
     //   5 - Change Special Color Number
     //   6 - Enable/disable Special Color Number c
     //   7 - current directory? (not in xterm spec, see https://gitlab.com/gnachman/iterm2/issues/3939)
@@ -2711,6 +2719,15 @@ export class InputHandler extends Disposable implements IInputHandler {
     this._iconName = data;
   }
 
+  /**
+   * OSC 4; <num> ; <text> ST (set ANSI color <num> to <text>)
+   */
+  public setAnsiColor(colorIndex: number, colorData: string): void {
+    //TODO: remove debug
+    console.log(`Setting ANSI color ${colorIndex} to value ${colorData}`);
+    this._onAnsiColorChange.fire(colorIndex, colorData);
+  }
+
   /**
    * ESC E
    * C1.NEL
diff --git a/src/common/Types.d.ts b/src/common/Types.d.ts
index bd0d11c6..00497932 100644
--- a/src/common/Types.d.ts
+++ b/src/common/Types.d.ts
@@ -389,6 +389,7 @@ export interface IInputHandler {
   /** CSI ' ~ */ deleteColumns(params: IParams): void;
   /** OSC 0
       OSC 2 */ setTitle(data: string): void;
+  /** OSC 4 */ setAnsiColor(colorIndex: number, colorData: string): void;
   /** ESC E */ nextLine(): void;
   /** ESC = */ keypadApplicationMode(): void;
   /** ESC > */ keypadNumericMode(): void;