diff --git a/poetry.lock b/poetry.lock
index d7f1c2246..89aefb50c 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -8,7 +8,7 @@ python-versions = "*"
 
 [[package]]
 name = "anyio"
-version = "3.3.4"
+version = "3.4.0"
 description = "High level compatibility layer for multiple asynchronous event loop implementations"
 category = "dev"
 optional = false
@@ -21,7 +21,7 @@ typing-extensions = {version = "*", markers = "python_version < \"3.8\""}
 
 [package.extras]
 doc = ["sphinx-rtd-theme", "sphinx-autodoc-typehints (>=1.2.0)"]
-test = ["coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "pytest (>=6.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (<0.15)", "mock (>=4)", "uvloop (>=0.15)"]
+test = ["coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "pytest (>=6.0)", "pytest-mock (>=3.6.1)", "trustme", "contextlib2", "uvloop (<0.15)", "mock (>=4)", "uvloop (>=0.15)"]
 trio = ["trio (>=0.16)"]
 
 [[package]]
@@ -1568,7 +1568,7 @@ testing = ["pytest (>=4.6)", "pytest-checkdocs (>=1.2.3)", "pytest-flake8", "pyt
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7"
-content-hash = "334bd8b9882fb220b97a7ad6f143f9b1f089b3ee93eba5f751766be761795aa0"
+content-hash = "2e9ec5b5ce18c050fb2da00b2f3e58c4fe3f28b2a088a6704f5add234799256d"
 
 [metadata.files]
 alabaster = [
@@ -1576,8 +1576,8 @@ alabaster = [
     {file = "alabaster-0.7.12.tar.gz", hash = "sha256:a661d72d58e6ea8a57f7a86e37d86716863ee5e92788398526d58b26a4e4dc02"},
 ]
 anyio = [
-    {file = "anyio-3.3.4-py3-none-any.whl", hash = "sha256:4fd09a25ab7fa01d34512b7249e366cd10358cdafc95022c7ff8c8f8a5026d66"},
-    {file = "anyio-3.3.4.tar.gz", hash = "sha256:67da67b5b21f96b9d3d65daa6ea99f5d5282cb09f50eb4456f8fb51dffefc3ff"},
+    {file = "anyio-3.4.0-py3-none-any.whl", hash = "sha256:2855a9423524abcdd652d942f8932fda1735210f77a6b392eafd9ff34d3fe020"},
+    {file = "anyio-3.4.0.tar.gz", hash = "sha256:24adc69309fb5779bc1e06158e143e0b6d2c56b302a3ac3de3083c705a6ed39d"},
 ]
 apipkg = [
     {file = "apipkg-1.5-py2.py3-none-any.whl", hash = "sha256:58587dd4dc3daefad0487f6d9ae32b4542b185e1c36db6993290e7c41ca2b47c"},
diff --git a/pyproject.toml b/pyproject.toml
index 76c40af63..7beefaeed 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -59,7 +59,7 @@ python = "^3.7"
 typing-extensions = "^3.7"
 
 [tool.poetry.dev-dependencies]
-anyio = "^3.3"
+anyio = "^3.4"
 curio = "^1.5"
 trio = "^0.19"
 attrs = "^21.2"