diff --git a/CHANGES/8564.feature.rst b/CHANGES/8564.feature.rst
new file mode 100644
index 00000000000..1eac9d12217
--- /dev/null
+++ b/CHANGES/8564.feature.rst
@@ -0,0 +1 @@
+Improved type on ``params`` to match the underlying type allowed by ``yarl`` -- by :user:`lpetre`.
diff --git a/aiohttp/client.py b/aiohttp/client.py
index 3c4a0f97c04..1e5c1448ce5 100644
--- a/aiohttp/client.py
+++ b/aiohttp/client.py
@@ -101,7 +101,7 @@
 from .http_websocket import WSHandshakeError, WSMessage, ws_ext_gen, ws_ext_parse
 from .streams import FlowControlDataQueue
 from .tracing import Trace, TraceConfig
-from .typedefs import JSONEncoder, LooseCookies, LooseHeaders, StrOrURL
+from .typedefs import JSONEncoder, LooseCookies, LooseHeaders, Query, StrOrURL
 
 __all__ = (
     # client_exceptions
@@ -161,7 +161,7 @@
 
 
 class _RequestOptions(TypedDict, total=False):
-    params: Union[Mapping[str, Union[str, int]], str, None]
+    params: Query
     data: Any
     json: Any
     cookies: Union[LooseCookies, None]
@@ -455,7 +455,7 @@ async def _request(
         method: str,
         str_or_url: StrOrURL,
         *,
-        params: Optional[Mapping[str, str]] = None,
+        params: Query = None,
         data: Any = None,
         json: Any = None,
         cookies: Optional[LooseCookies] = None,
@@ -835,7 +835,7 @@ def ws_connect(
         heartbeat: Optional[float] = None,
         auth: Optional[BasicAuth] = None,
         origin: Optional[str] = None,
-        params: Optional[Mapping[str, str]] = None,
+        params: Query = None,
         headers: Optional[LooseHeaders] = None,
         proxy: Optional[StrOrURL] = None,
         proxy_auth: Optional[BasicAuth] = None,
@@ -887,7 +887,7 @@ async def _ws_connect(
         heartbeat: Optional[float] = None,
         auth: Optional[BasicAuth] = None,
         origin: Optional[str] = None,
-        params: Optional[Mapping[str, str]] = None,
+        params: Query = None,
         headers: Optional[LooseHeaders] = None,
         proxy: Optional[StrOrURL] = None,
         proxy_auth: Optional[BasicAuth] = None,
@@ -1452,7 +1452,7 @@ def request(
     method: str,
     url: StrOrURL,
     *,
-    params: Optional[Mapping[str, str]] = None,
+    params: Query = None,
     data: Any = None,
     json: Any = None,
     headers: Optional[LooseHeaders] = None,
diff --git a/aiohttp/client_reqrep.py b/aiohttp/client_reqrep.py
index e0232a40c4c..79073cb895b 100644
--- a/aiohttp/client_reqrep.py
+++ b/aiohttp/client_reqrep.py
@@ -67,6 +67,7 @@
     JSONDecoder,
     LooseCookies,
     LooseHeaders,
+    Query,
     RawHeaders,
 )
 
@@ -262,7 +263,7 @@ def __init__(
         method: str,
         url: URL,
         *,
-        params: Optional[Mapping[str, str]] = None,
+        params: Query = None,
         headers: Optional[LooseHeaders] = None,
         skip_auto_headers: Optional[Iterable[str]] = None,
         data: Any = None,
diff --git a/aiohttp/typedefs.py b/aiohttp/typedefs.py
index 9fb21c15f83..2e285fa2561 100644
--- a/aiohttp/typedefs.py
+++ b/aiohttp/typedefs.py
@@ -8,6 +8,7 @@
     Iterable,
     Mapping,
     Protocol,
+    Sequence,
     Tuple,
     Union,
 )
@@ -15,6 +16,18 @@
 from multidict import CIMultiDict, CIMultiDictProxy, MultiDict, MultiDictProxy, istr
 from yarl import URL
 
+try:
+    # Available in yarl>=1.10.0
+    from yarl import Query as _Query
+except ImportError:  # pragma: no cover
+    SimpleQuery = Union[str, int, float]  # pragma: no cover
+    QueryVariable = Union[SimpleQuery, "Sequence[SimpleQuery]"]  # pragma: no cover
+    _Query = Union[  # type: ignore[misc]  # pragma: no cover
+        None, str, "Mapping[str, QueryVariable]", "Sequence[Tuple[str, QueryVariable]]"
+    ]
+
+Query = _Query
+
 DEFAULT_JSON_ENCODER = json.dumps
 DEFAULT_JSON_DECODER = json.loads