diff --git a/poetry.lock b/poetry.lock
index c4b683d..328147b 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -557,7 +557,7 @@ testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.8"
-content-hash = "925e0561e554a6ddd618b7ecfec7f5a2dd8e083e18d353cae459e6e7cfc3c3ca"
+content-hash = "5a8691c5a4340f0e47e0b0b3e2d2b4cb3a5b1dcd9c43efc76d70627149b4499c"
 
 [metadata.files]
 astroid = [
diff --git a/pyproject.toml b/pyproject.toml
index eb6cf8a..894ffbf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 ]
 [tool.poetry.dependencies]
 python = "^3.8"
-PyYAML = "^6.0"
+PyYAML = ">= 5.4, <= 6.0"
 
 [tool.poetry.dev-dependencies]
 pytest = "^6.2.3"