diff --git a/poetry.lock b/poetry.lock
index 156f54a..4986cea 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1383,14 +1383,14 @@ testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "requests", "xm
 
 [[package]]
 name = "pytest-cov"
-version = "3.0.0"
+version = "4.0.0"
 description = "Pytest plugin for measuring coverage."
 category = "dev"
 optional = false
 python-versions = ">=3.6"
 files = [
-    {file = "pytest-cov-3.0.0.tar.gz", hash = "sha256:e7f0f5b1617d2210a2cabc266dfe2f4c75a8d32fb89eafb7ad9d06f6d076d470"},
-    {file = "pytest_cov-3.0.0-py3-none-any.whl", hash = "sha256:578d5d15ac4a25e5f961c938b85a05b09fdaae9deef3bb6de9a6e766622ca7a6"},
+    {file = "pytest-cov-4.0.0.tar.gz", hash = "sha256:996b79efde6433cdbd0088872dbc5fb3ed7fe1578b68cdbba634f14bb8dd0470"},
+    {file = "pytest_cov-4.0.0-py3-none-any.whl", hash = "sha256:2feb1b751d66a8bd934e5edfa2e961d11309dc37b73b0eabe73b5945fee20f6b"},
 ]
 
 [package.dependencies]
@@ -2088,4 +2088,4 @@ func = ["numpy", "matplotlib"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9"
-content-hash = "ac734015e99e72972ea55f47f5ddef6e64c4fb2b9ce3f5a29280ad22246abdbf"
+content-hash = "51c5b9708639cc6d7643a59c46984a70e3694172472053d05f9f19302d58defb"
diff --git a/pyproject.toml b/pyproject.toml
index 9800f17..12f36c5 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -91,7 +91,7 @@ all = ["python-vxi11", "pyvisa", "pyvisa-py", "sphinx", "sphinx_rtd_theme", "sph
 [tool.poetry.dev-dependencies]
 pre-commit = "^3.2.2"
 pytest = "^6.2.5"
-pytest-cov = "^3.0.0"
+pytest-cov = "^4.0.0"
 pytest-instafail = "^0.5.0"
 pytest-xdist = { version = "^2.5.0", extras = ["psutil"] }
 flake8 = "^3.8.4"