diff --git a/types/plotly.js/index.d.ts b/types/plotly.js/index.d.ts
index a4f68555123b6b..0ca3993778fd6a 100644
--- a/types/plotly.js/index.d.ts
+++ b/types/plotly.js/index.d.ts
@@ -639,6 +639,15 @@ export interface Layout {
     hovermode: "closest" | "x" | "y" | "x unified" | "y unified" | false;
     hoverdistance: number;
     hoverlabel: Partial<HoverLabel>;
+    /**
+     * Determines expansion of hover effects to other subplots.
+     * If "single" just the axis pair of the primary point is included without overlaying subplots.
+     * If "overlaying" all subplots using the main axis and occupying the same space are included.
+     * If "axis", also include stacked subplots using the same axis
+     * when `hovermode` is set to "x", "x unified", "y" or "y unified".
+     * @default "overlaying"
+     */
+    hoversubplots: "single" | "overlaying" | "axis";
     calendar: Calendar;
 
     // these are just the most common nested property updates that you might
diff --git a/types/plotly.js/test/core-tests.ts b/types/plotly.js/test/core-tests.ts
index 233b1ed8458c5b..483c06727a33d5 100644
--- a/types/plotly.js/test/core-tests.ts
+++ b/types/plotly.js/test/core-tests.ts
@@ -53,7 +53,8 @@ const layout = {
     datarevision: 0,
     editrevision: 0,
     selectionrevision: 0,
-};
+    hoversubplots: "overlaying",
+} satisfies Partial<Layout>;
 
 //////////////////////////////////////////////////////////////////////
 // Plotly.newPlot
diff --git a/types/plotly.js/v2/index.d.ts b/types/plotly.js/v2/index.d.ts
index 3d9938c35b0caa..06d7465fa8d714 100644
--- a/types/plotly.js/v2/index.d.ts
+++ b/types/plotly.js/v2/index.d.ts
@@ -642,6 +642,15 @@ export interface Layout {
     hovermode: "closest" | "x" | "y" | "x unified" | "y unified" | false;
     hoverdistance: number;
     hoverlabel: Partial<HoverLabel>;
+    /**
+     * Determines expansion of hover effects to other subplots.
+     * If "single" just the axis pair of the primary point is included without overlaying subplots.
+     * If "overlaying" all subplots using the main axis and occupying the same space are included.
+     * If "axis", also include stacked subplots using the same axis
+     * when `hovermode` is set to "x", "x unified", "y" or "y unified".
+     * @default "overlaying"
+     */
+    hoversubplots: "single" | "overlaying" | "axis";
     calendar: Calendar;
     "xaxis.range": [Datum, Datum];
     "xaxis.range[0]": Datum;
diff --git a/types/plotly.js/v2/test/core-tests.ts b/types/plotly.js/v2/test/core-tests.ts
index 4ced267064ad7b..ca730c92bc523e 100644
--- a/types/plotly.js/v2/test/core-tests.ts
+++ b/types/plotly.js/v2/test/core-tests.ts
@@ -49,7 +49,8 @@ const layout = {
     datarevision: 0,
     editrevision: 0,
     selectionrevision: 0,
-};
+    hoversubplots: "overlaying",
+} satisfies Partial<Layout>;
 
 //////////////////////////////////////////////////////////////////////
 // Plotly.newPlot
diff --git a/types/react-dom/canary.d.ts b/types/react-dom/canary.d.ts
index 403466347a8071..1d65161ed1b530 100644
--- a/types/react-dom/canary.d.ts
+++ b/types/react-dom/canary.d.ts
@@ -65,6 +65,7 @@ declare module "react" {
             listener: EventListener,
             optionsOrUseCapture?: Parameters<Element["removeEventListener"]>[2],
         ): void;
+        dispatchEvent(event: Event): boolean;
         scrollIntoView(alignToTop?: boolean): void;
     }
 }