diff --git a/poetry.lock b/poetry.lock
index 30fd332..5506324 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -19,11 +19,11 @@ python-versions = "*"
 
 [[package]]
 name = "async-timeout"
-version = "3.0.1"
+version = "4.0.2"
 description = "Timeout context manager for asyncio programs"
 category = "main"
 optional = false
-python-versions = ">=3.5.3"
+python-versions = ">=3.6"
 
 [[package]]
 name = "asyncio-mqtt"
@@ -497,7 +497,7 @@ watchmedo = ["PyYAML (>=3.10)", "argh (>=0.24.1)"]
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.9"
-content-hash = "936da6610e332467c451c5cdf00172c69844914ea041e9bd2789936c8bf06f43"
+content-hash = "1f851560c6c7b21ac84f0ed87372e45b42179a383df06c02b187d4c80f8ee33f"
 
 [metadata.files]
 aioserial = [
@@ -509,8 +509,8 @@ appdirs = [
     {file = "appdirs-1.4.4.tar.gz", hash = "sha256:7d5d0167b2b1ba821647616af46a749d1c653740dd0d2415100fe26e27afdf41"},
 ]
 async-timeout = [
-    {file = "async-timeout-3.0.1.tar.gz", hash = "sha256:0c3c816a028d47f659d6ff5c745cb2acf1f966da1fe5c19c77a70282b25f4c5f"},
-    {file = "async_timeout-3.0.1-py3-none-any.whl", hash = "sha256:4291ca197d287d274d0b6cb5d6f8f8f82d434ed288f962539ff18cc9012f9ea3"},
+    {file = "async-timeout-4.0.2.tar.gz", hash = "sha256:2163e1640ddb52b7a8c80d0a67a08587e5d245cc9c553a74a847056bc2976b15"},
+    {file = "async_timeout-4.0.2-py3-none-any.whl", hash = "sha256:8ca1e4fcf50d07413d66d1a5e416e42cfdf5851c981d679a09851a6853383b3c"},
 ]
 asyncio-mqtt = [
     {file = "asyncio_mqtt-0.11.1-py3-none-any.whl", hash = "sha256:4d9cd8d94ae226b50cc3f143fe063af2ae48bd9b0f10d2fc8bb609e88d8a792f"},
diff --git a/pyproject.toml b/pyproject.toml
index 65bc61d..8383511 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@ typer = "^0.3.2"
 pydantic = "^1.8.2"
 tomlkit = "^0.7.2"
 asyncio-mqtt = "^0.11.1"
-async-timeout = "^3.0.1"
+async-timeout = "^4.0.2"
 aioserial = "^1.3.0"
 
 [tool.poetry.dev-dependencies]