diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 81d219b8ad3..2deba3f4d1d 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -95,3 +95,7 @@ pytest_asyncio==1000000000.0.0
 # https://github.com/jkeljo/sisyphus-control/issues/6
 python-engineio>=3.13.1,<4.0
 python-socketio>=4.6.0,<5.0
+
+# Constrain multidict to avoid typing issues
+# https://github.com/home-assistant/core/pull/64792
+multidict<6.0.0
diff --git a/homeassistant/util/aiohttp.py b/homeassistant/util/aiohttp.py
index 765a9994a67..aa1aea1abc3 100644
--- a/homeassistant/util/aiohttp.py
+++ b/homeassistant/util/aiohttp.py
@@ -44,13 +44,13 @@ class MockRequest:
         self.method = method
         self.url = url
         self.status = status
-        self.headers: CIMultiDict[str, str] = CIMultiDict(headers or {})
+        self.headers: CIMultiDict[str] = CIMultiDict(headers or {})
         self.query_string = query_string or ""
         self._content = content
         self.mock_source = mock_source
 
     @property
-    def query(self) -> MultiDict[str, str]:
+    def query(self) -> MultiDict[str]:
         """Return a dictionary with the query variables."""
         return MultiDict(parse_qsl(self.query_string, keep_blank_values=True))
 
@@ -68,7 +68,7 @@ class MockRequest:
         """Return the body as JSON."""
         return json.loads(self._text)
 
-    async def post(self) -> MultiDict[str, str]:
+    async def post(self) -> MultiDict[str]:
         """Return POST parameters."""
         return MultiDict(parse_qsl(self._text, keep_blank_values=True))
 
diff --git a/script/gen_requirements_all.py b/script/gen_requirements_all.py
index 952bd8b8f48..bfba8bddd43 100755
--- a/script/gen_requirements_all.py
+++ b/script/gen_requirements_all.py
@@ -120,6 +120,10 @@ pytest_asyncio==1000000000.0.0
 # https://github.com/jkeljo/sisyphus-control/issues/6
 python-engineio>=3.13.1,<4.0
 python-socketio>=4.6.0,<5.0
+
+# Constrain multidict to avoid typing issues
+# https://github.com/home-assistant/core/pull/64792
+multidict<6.0.0
 """
 
 IGNORE_PRE_COMMIT_HOOK_ID = (