diff --git a/homeassistant/components/http/security_filter.py b/homeassistant/components/http/security_filter.py
index 32ebcacfff4..eab0a2b0764 100644
--- a/homeassistant/components/http/security_filter.py
+++ b/homeassistant/components/http/security_filter.py
@@ -40,12 +40,19 @@ def setup_security_filter(app):
     @middleware
     async def security_filter_middleware(request, handler):
         """Process request and block commonly known exploit attempts."""
-        if FILTERS.search(request.raw_path):
+        if FILTERS.search(request.path):
             _LOGGER.warning(
                 "Filtered a potential harmful request to: %s", request.raw_path
             )
             raise HTTPBadRequest
 
+        if FILTERS.search(request.query_string):
+            _LOGGER.warning(
+                "Filtered a request with a potential harmful query string: %s",
+                request.raw_path,
+            )
+            raise HTTPBadRequest
+
         return await handler(request)
 
     app.middlewares.append(security_filter_middleware)
diff --git a/homeassistant/const.py b/homeassistant/const.py
index 582a5260fb5..318166c0f7d 100644
--- a/homeassistant/const.py
+++ b/homeassistant/const.py
@@ -1,7 +1,7 @@
 """Constants used by Home Assistant components."""
 MAJOR_VERSION = 2021
 MINOR_VERSION = 1
-PATCH_VERSION = "2"
+PATCH_VERSION = "3"
 __short_version__ = f"{MAJOR_VERSION}.{MINOR_VERSION}"
 __version__ = f"{__short_version__}.{PATCH_VERSION}"
 REQUIRED_PYTHON_VER = (3, 7, 1)
diff --git a/homeassistant/package_constraints.txt b/homeassistant/package_constraints.txt
index 11e7dd89918..fa9a1ed5640 100644
--- a/homeassistant/package_constraints.txt
+++ b/homeassistant/package_constraints.txt
@@ -1,6 +1,6 @@
 PyJWT==1.7.1
 PyNaCl==1.3.0
-aiohttp==3.7.1
+aiohttp==3.7.3
 aiohttp_cors==0.7.0
 astral==1.10.1
 async_timeout==3.0.1
@@ -29,7 +29,7 @@ ruamel.yaml==0.15.100
 sqlalchemy==1.3.20
 voluptuous-serialize==2.4.0
 voluptuous==0.12.1
-yarl==1.4.2
+yarl==1.6.3
 zeroconf==0.28.8
 
 pycryptodome>=3.6.6
diff --git a/requirements.txt b/requirements.txt
index cbe339fd835..ece5a5a3709 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,7 @@
 -c homeassistant/package_constraints.txt
 
 # Home Assistant Core
-aiohttp==3.7.1
+aiohttp==3.7.3
 astral==1.10.1
 async_timeout==3.0.1
 attrs==19.3.0
@@ -21,4 +21,4 @@ requests==2.25.0
 ruamel.yaml==0.15.100
 voluptuous==0.12.1
 voluptuous-serialize==2.4.0
-yarl==1.4.2
+yarl==1.6.3
diff --git a/setup.py b/setup.py
index c9acb4d82d7..096e376b1a1 100755
--- a/setup.py
+++ b/setup.py
@@ -32,7 +32,7 @@ PROJECT_URLS = {
 PACKAGES = find_packages(exclude=["tests", "tests.*"])
 
 REQUIRES = [
-    "aiohttp==3.7.1",
+    "aiohttp==3.7.3",
     "astral==1.10.1",
     "async_timeout==3.0.1",
     "attrs==19.3.0",
@@ -53,7 +53,7 @@ REQUIRES = [
     "ruamel.yaml==0.15.100",
     "voluptuous==0.12.1",
     "voluptuous-serialize==2.4.0",
-    "yarl==1.4.2",
+    "yarl==1.6.3",
 ]
 
 MIN_PY_VERSION = ".".join(map(str, hass_const.REQUIRED_PYTHON_VER))
diff --git a/tests/components/http/test_security_filter.py b/tests/components/http/test_security_filter.py
index 8190c514603..eb1ac54d8f6 100644
--- a/tests/components/http/test_security_filter.py
+++ b/tests/components/http/test_security_filter.py
@@ -1,6 +1,7 @@
 """Test security filter middleware."""
 from aiohttp import web
 import pytest
+import urllib3
 
 from homeassistant.components.http.security_filter import setup_security_filter
 
@@ -35,17 +36,26 @@ async def test_ok_requests(request_path, request_params, aiohttp_client):
 
 
 @pytest.mark.parametrize(
-    "request_path,request_params",
+    "request_path,request_params,fail_on_query_string",
     [
-        ("/proc/self/environ", {}),
-        ("/", {"test": "/test/../../api"}),
-        ("/", {"test": "test/../../api"}),
-        ("/", {"sql": ";UNION SELECT (a, b"}),
-        ("/", {"sql": "concat(..."}),
-        ("/", {"xss": "<script >"}),
+        ("/proc/self/environ", {}, False),
+        ("/", {"test": "/test/../../api"}, True),
+        ("/", {"test": "test/../../api"}, True),
+        ("/", {"test": "/test/%2E%2E%2f%2E%2E%2fapi"}, True),
+        ("/", {"test": "test/%2E%2E%2f%2E%2E%2fapi"}, True),
+        ("/test/%2E%2E%2f%2E%2E%2fapi", {}, False),
+        ("/", {"sql": ";UNION SELECT (a, b"}, True),
+        ("/", {"sql": "UNION%20SELECT%20%28a%2C%20b"}, True),
+        ("/UNION%20SELECT%20%28a%2C%20b", {}, False),
+        ("/", {"sql": "concat(..."}, True),
+        ("/", {"xss": "<script >"}, True),
+        ("/<script >", {"xss": ""}, False),
+        ("/%3Cscript%3E", {}, False),
     ],
 )
-async def test_bad_requests(request_path, request_params, aiohttp_client):
+async def test_bad_requests(
+    request_path, request_params, fail_on_query_string, aiohttp_client, caplog, loop
+):
     """Test request paths that should be filtered."""
     app = web.Application()
     app.router.add_get("/{all:.*}", mock_handler)
@@ -53,6 +63,26 @@ async def test_bad_requests(request_path, request_params, aiohttp_client):
     setup_security_filter(app)
 
     mock_api_client = await aiohttp_client(app)
-    resp = await mock_api_client.get(request_path, params=request_params)
+
+    # Manual params handling
+    if request_params:
+        raw_params = "&".join(f"{val}={key}" for val, key in request_params.items())
+        man_params = f"?{raw_params}"
+    else:
+        man_params = ""
+
+    http = urllib3.PoolManager()
+    resp = await loop.run_in_executor(
+        None,
+        http.request,
+        "GET",
+        f"http://{mock_api_client.host}:{mock_api_client.port}/{request_path}{man_params}",
+        request_params,
+    )
 
     assert resp.status == 400
+
+    message = "Filtered a potential harmful request to:"
+    if fail_on_query_string:
+        message = "Filtered a request with a potential harmful query string:"
+    assert message in caplog.text
diff --git a/tests/testing_config/media/not_media.txt b/tests/testing_config/media/not_media.txt
index e69de29bb2d..d8f2010dc98 100644
--- a/tests/testing_config/media/not_media.txt
+++ b/tests/testing_config/media/not_media.txt
@@ -0,0 +1 @@
+This is just a text
\ No newline at end of file
diff --git a/tests/testing_config/media/test.mp3 b/tests/testing_config/media/test.mp3
index e69de29bb2d..8208765d04f 100644
--- a/tests/testing_config/media/test.mp3
+++ b/tests/testing_config/media/test.mp3
@@ -0,0 +1 @@
+I sing a song
\ No newline at end of file