diff --git a/aiohttp/client_reqrep.py b/aiohttp/client_reqrep.py
index 1fa00e46deb..956c6d2a177 100644
--- a/aiohttp/client_reqrep.py
+++ b/aiohttp/client_reqrep.py
@@ -27,7 +27,7 @@
 )
 
 from multidict import CIMultiDict, CIMultiDictProxy, MultiDict, MultiDictProxy
-from yarl import URL, __version__ as yarl_version
+from yarl import URL
 
 from . import hdrs, helpers, http, multipart, payload
 from .abc import AbstractStreamWriter
@@ -91,7 +91,6 @@
 
 
 _CONTAINS_CONTROL_CHAR_RE = re.compile(r"[^-!#$%&'*+.^_`|~0-9a-zA-Z]")
-_YARL_SUPPORTS_EXTEND_QUERY = tuple(map(int, yarl_version.split(".")[:2])) >= (1, 11)
 
 
 def _gen_default_accept_encoding() -> str:
@@ -231,13 +230,7 @@ def __init__(
         # assert session is not None
         self._session = cast("ClientSession", session)
         if params:
-            if _YARL_SUPPORTS_EXTEND_QUERY:
-                url = url.extend_query(params)
-            else:
-                q = MultiDict(url.query)
-                url2 = url.with_query(params)
-                q.extend(url2.query)
-                url = url.with_query(q)
+            url = url.extend_query(params)
         self.original_url = url
         self.url = url.with_fragment(None)
         self.method = method.upper()
diff --git a/aiohttp/typedefs.py b/aiohttp/typedefs.py
index 2e285fa2561..cc8c0825b4e 100644
--- a/aiohttp/typedefs.py
+++ b/aiohttp/typedefs.py
@@ -8,23 +8,12 @@
     Iterable,
     Mapping,
     Protocol,
-    Sequence,
     Tuple,
     Union,
 )
 
 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]]"
-    ]
+from yarl import URL, Query as _Query
 
 Query = _Query
 
diff --git a/tests/test_client_functional.py b/tests/test_client_functional.py
index 951d7a81d68..a0ae8ceaad9 100644
--- a/tests/test_client_functional.py
+++ b/tests/test_client_functional.py
@@ -33,7 +33,7 @@
 from yarl import URL
 
 import aiohttp
-from aiohttp import Fingerprint, ServerFingerprintMismatch, client_reqrep, hdrs, web
+from aiohttp import Fingerprint, ServerFingerprintMismatch, hdrs, web
 from aiohttp.abc import AbstractResolver, ResolveResult
 from aiohttp.client_exceptions import (
     ClientResponseError,
@@ -706,10 +706,7 @@ async def handler(request: web.Request) -> web.Response:
         assert 200 == resp.status
 
 
-@pytest.mark.parametrize("yarl_supports_extend_query", [True, False])
-async def test_params_and_query_string(
-    aiohttp_client: AiohttpClient, yarl_supports_extend_query: bool
-) -> None:
+async def test_params_and_query_string(aiohttp_client: AiohttpClient) -> None:
     """Test combining params with an existing query_string."""
 
     async def handler(request: web.Request) -> web.Response:
@@ -720,18 +717,13 @@ async def handler(request: web.Request) -> web.Response:
     app.router.add_route("GET", "/", handler)
     client = await aiohttp_client(app)
 
-    # Ensure the old path is tested for old yarl versions
-    with mock.patch.object(
-        client_reqrep, "_YARL_SUPPORTS_EXTEND_QUERY", yarl_supports_extend_query
-    ):
-        async with client.get("/?q=abc", params="q=test&d=dog") as resp:
-            assert resp.status == 200
+    async with client.get("/?q=abc", params="q=test&d=dog") as resp:
+        assert resp.status == 200
 
 
 @pytest.mark.parametrize("params", [None, "", {}, MultiDict()])
-@pytest.mark.parametrize("yarl_supports_extend_query", [True, False])
 async def test_empty_params_and_query_string(
-    aiohttp_client: AiohttpClient, params: Any, yarl_supports_extend_query: bool
+    aiohttp_client: AiohttpClient, params: Any
 ) -> None:
     """Test combining empty params with an existing query_string."""
 
@@ -743,12 +735,8 @@ async def handler(request: web.Request) -> web.Response:
     app.router.add_route("GET", "/", handler)
     client = await aiohttp_client(app)
 
-    # Ensure the old path is tested for old yarl versions
-    with mock.patch.object(
-        client_reqrep, "_YARL_SUPPORTS_EXTEND_QUERY", yarl_supports_extend_query
-    ):
-        async with client.get("/?q=abc", params=params) as resp:
-            assert resp.status == 200
+    async with client.get("/?q=abc", params=params) as resp:
+        assert resp.status == 200
 
 
 async def test_drop_params_on_redirect(aiohttp_client: AiohttpClient) -> None: