diff --git a/package-lock.json b/package-lock.json
index 43d3a60b0c0b69..8d22b9d0c12965 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -27803,9 +27803,10 @@
 			}
 		},
 		"node_modules/hpq": {
-			"version": "1.3.0",
-			"resolved": "https://registry.npmjs.org/hpq/-/hpq-1.3.0.tgz",
-			"integrity": "sha512-fvYTvdCFOWQupGxqkahrkA+ERBuMdzkxwtUdKrxR6rmMd4Pfl+iZ1QiQYoaZ0B/v0y59MOMnz3XFUWbT50/NWA=="
+			"version": "1.4.0",
+			"resolved": "https://registry.npmjs.org/hpq/-/hpq-1.4.0.tgz",
+			"integrity": "sha512-ycJQMRaRPBcfnoT1gS5I1XCvbbw9KO94Y0vkwksuOjcJMqNZtb03MF2tCItLI2mQbkZWSSeFinoRDPmjzv4tKg==",
+			"license": "MIT"
 		},
 		"node_modules/html-dom-parser": {
 			"version": "5.1.2",
@@ -50794,7 +50795,7 @@
 				"change-case": "^4.1.2",
 				"colord": "^2.9.3",
 				"fast-deep-equal": "^3.1.3",
-				"hpq": "^1.3.0",
+				"hpq": "^1.4.0",
 				"is-plain-object": "^5.0.0",
 				"marked": "^18.0.3",
 				"memize": "^2.1.1",
diff --git a/packages/blocks/CHANGELOG.md b/packages/blocks/CHANGELOG.md
index 57cac4bb3957d6..245fe4e041c63d 100644
--- a/packages/blocks/CHANGELOG.md
+++ b/packages/blocks/CHANGELOG.md
@@ -5,6 +5,7 @@
 ### Internal
 
 -   Update `memize` to 2.1.1 ([#80764](https://github.com/WordPress/gutenberg/pull/80764)).
+-   Update `hpq` to 1.4.0 for its bundled TypeScript types ([#81199](https://github.com/WordPress/gutenberg/pull/81199)).
 
 ## 15.24.0 (2026-07-14)
 
diff --git a/packages/blocks/package.json b/packages/blocks/package.json
index f9ea8ee3209ed5..6af94fed6eba7f 100644
--- a/packages/blocks/package.json
+++ b/packages/blocks/package.json
@@ -68,7 +68,7 @@
 		"change-case": "^4.1.2",
 		"colord": "^2.9.3",
 		"fast-deep-equal": "^3.1.3",
-		"hpq": "^1.3.0",
+		"hpq": "^1.4.0",
 		"is-plain-object": "^5.0.0",
 		"marked": "^18.0.3",
 		"memize": "^2.1.1",
diff --git a/packages/blocks/src/api/matchers.ts b/packages/blocks/src/api/matchers.ts
index 9c588dbc285845..a0c6a97cee8039 100644
--- a/packages/blocks/src/api/matchers.ts
+++ b/packages/blocks/src/api/matchers.ts
@@ -1,7 +1,6 @@
 /**
  * External dependencies
  */
-// @ts-expect-error `hpq` does not ship type declarations.
 export { attr, prop, text, query } from 'hpq';
 
 /**
diff --git a/packages/blocks/src/api/parser/get-block-attributes.ts b/packages/blocks/src/api/parser/get-block-attributes.ts
index 33c5c74650471b..5032d76f6e0700 100644
--- a/packages/blocks/src/api/parser/get-block-attributes.ts
+++ b/packages/blocks/src/api/parser/get-block-attributes.ts
@@ -1,8 +1,8 @@
 /**
  * External dependencies
  */
-// @ts-expect-error `hpq` does not ship type declarations.
 import { parse as hpqParse } from 'hpq';
+import type { MatcherObj } from 'hpq';
 import memoize from 'memize';
 
 /**
@@ -39,9 +39,9 @@ import type { BlockAttribute, BlockType } from '../../types';
  * @return Enhanced hpq matcher.
  */
 export const toBooleanAttributeMatcher =
-	( matcher: ( value: unknown ) => unknown ) =>
-	( value: unknown ): boolean =>
-		matcher( value ) !== undefined;
+	( matcher: ( domNode: Element ) => unknown ) =>
+	( domNode: Element ): boolean =>
+		matcher( domNode ) !== undefined;
 
 /**
  * Returns true if value is of the given JSON schema type, or false otherwise.
@@ -205,12 +205,12 @@ export const matcherFromSource = memoize(
 	): ( ( domNode: Element ) => unknown ) | undefined => {
 		switch ( sourceConfig.source ) {
 			case 'attribute': {
-				let matcher = attr(
+				const matcher = attr(
 					sourceConfig.selector,
-					sourceConfig.attribute
+					sourceConfig.attribute!
 				);
 				if ( sourceConfig.type === 'boolean' ) {
-					matcher = toBooleanAttributeMatcher( matcher );
+					return toBooleanAttributeMatcher( matcher );
 				}
 				return matcher;
 			}
@@ -228,6 +228,11 @@ export const matcherFromSource = memoize(
 			case 'node':
 				return node( sourceConfig.selector );
 			case 'query':
+				/*
+				 * Sub-matchers may be undefined for unknown source types. hpq
+				 * tolerates this and matches such keys as undefined, but its
+				 * types don't allow for it.
+				 */
 				const subMatchers = Object.fromEntries(
 					Object.entries( sourceConfig.query! ).map(
 						( [ key, subSourceConfig ] ) => [
@@ -235,12 +240,12 @@ export const matcherFromSource = memoize(
 							matcherFromSource( subSourceConfig ),
 						]
 					)
-				);
-				return query( sourceConfig.selector, subMatchers );
+				) as MatcherObj;
+				return query( sourceConfig.selector!, subMatchers );
 			case 'tag': {
 				const matcher = prop( sourceConfig.selector, 'nodeName' );
-				return ( domNode: Node ) =>
-					( matcher( domNode ) as string )?.toLowerCase();
+				return ( domNode: Element ) =>
+					matcher( domNode )?.toLowerCase();
 			}
 			default:
 				// eslint-disable-next-line no-console
@@ -259,8 +264,8 @@ export const matcherFromSource = memoize(
  *
  * @return Parsed DOM node.
  */
-function parseHtml( innerHTML: string | Node ): Node {
-	return hpqParse( innerHTML, ( h: Node ) => h );
+function parseHtml( innerHTML: string | Node ): Element {
+	return hpqParse( innerHTML as string | Element, ( h: Element ) => h );
 }
 
 /**