diff --git a/poetry.lock b/poetry.lock
index 7ed72fb..3e4323d 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2476,46 +2476,26 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 
 [[package]]
 name = "virtualenv"
-version = "20.16.5"
+version = "20.15.1"
 description = "Virtual Python Environment builder"
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,!=3.4.*,>=2.7"
 files = [
-    {file = "virtualenv-20.16.5-py3-none-any.whl", hash = "sha256:d07dfc5df5e4e0dbc92862350ad87a36ed505b978f6c39609dc489eadd5b0d27"},
-    {file = "virtualenv-20.16.5.tar.gz", hash = "sha256:227ea1b9994fdc5ea31977ba3383ef296d7472ea85be9d6732e42a91c04e80da"},
+    {file = "virtualenv-20.15.1-py2.py3-none-any.whl", hash = "sha256:b30aefac647e86af6d82bfc944c556f8f1a9c90427b2fb4e3bfbf338cb82becf"},
+    {file = "virtualenv-20.15.1.tar.gz", hash = "sha256:288171134a2ff3bfb1a2f54f119e77cd1b81c29fc1265a2356f3e8d14c7d58c4"},
 ]
 
 [package.dependencies]
-distlib = ">=0.3.5,<1"
-filelock = ">=3.4.1,<4"
-platformdirs = ">=2.4,<3"
+distlib = ">=0.3.1,<1"
+filelock = ">=3.2,<4"
+importlib-metadata = {version = ">=0.12", markers = "python_version < \"3.8\""}
+platformdirs = ">=2,<3"
+six = ">=1.9.0,<2"
 
 [package.extras]
-docs = ["proselint (>=0.13)", "sphinx (>=5.1.1)", "sphinx-argparse (>=0.3.1)", "sphinx-rtd-theme (>=1)", "towncrier (>=21.9)"]
-testing = ["coverage (>=6.2)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=21.3)", "pytest (>=7.0.1)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.2)", "pytest-mock (>=3.6.1)", "pytest-randomly (>=3.10.3)", "pytest-timeout (>=2.1)"]
-
-[[package]]
-name = "virtualenv"
-version = "20.21.0"
-description = "Virtual Python Environment builder"
-category = "dev"
-optional = false
-python-versions = ">=3.7"
-files = [
-    {file = "virtualenv-20.21.0-py3-none-any.whl", hash = "sha256:31712f8f2a17bd06234fa97fdf19609e789dd4e3e4bf108c3da71d710651adbc"},
-    {file = "virtualenv-20.21.0.tar.gz", hash = "sha256:f50e3e60f990a0757c9b68333c9fdaa72d7188caa417f96af9e52407831a3b68"},
-]
-
-[package.dependencies]
-distlib = ">=0.3.6,<1"
-filelock = ">=3.4.1,<4"
-importlib-metadata = {version = ">=4.8.3", markers = "python_version < \"3.8\""}
-platformdirs = ">=2.4,<4"
-
-[package.extras]
-docs = ["furo (>=2022.12.7)", "proselint (>=0.13)", "sphinx (>=6.1.3)", "sphinx-argparse (>=0.4)", "sphinxcontrib-towncrier (>=0.2.1a0)", "towncrier (>=22.12)"]
-test = ["covdefaults (>=2.2.2)", "coverage (>=7.1)", "coverage-enable-subprocess (>=1)", "flaky (>=3.7)", "packaging (>=23)", "pytest (>=7.2.1)", "pytest-env (>=0.8.1)", "pytest-freezegun (>=0.4.2)", "pytest-mock (>=3.10)", "pytest-randomly (>=3.12)", "pytest-timeout (>=2.1)"]
+docs = ["proselint (>=0.10.2)", "sphinx (>=3)", "sphinx-argparse (>=0.2.5)", "sphinx-rtd-theme (>=0.4.3)", "towncrier (>=21.3)"]
+testing = ["coverage (>=4)", "coverage-enable-subprocess (>=1)", "flaky (>=3)", "packaging (>=20.0)", "pytest (>=4)", "pytest-env (>=0.6.2)", "pytest-freezegun (>=0.4.1)", "pytest-mock (>=2)", "pytest-randomly (>=1)", "pytest-timeout (>=1)"]
 
 [[package]]
 name = "wcwidth"
@@ -2730,4 +2710,4 @@ testing = ["big-O", "flake8 (<5)", "jaraco.functools", "jaraco.itertools", "more
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.7.1"
-content-hash = "395f171cd07966e0f9f577361308afff01ce205de65f28a183878e5c321f4cd2"
+content-hash = "15c85f4ce853897c31e36db65fba20fddd41a694c87ad19990fb732a2c188bdf"
diff --git a/pyproject.toml b/pyproject.toml
index c23ba85..0a59013 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,6 +36,11 @@ pytest = "^6.2.5"
 pytest-cov = "^3.0.0"
 toml = "^0.10.2"
 ruamel-yaml = {version = "^0.17.21", python = "^3.10"}
+# This is a workaround for this issue with the Poetry export
+# plugin which was blocking the 'security' CI check:
+#
+# https://github.com/python-poetry/poetry-plugin-export/issues/176
+virtualenv = ">=20.15,<20.16"
 
 [tool.poetry.group.ci.dependencies]
 poetry = "^1.4.2"