diff --git a/poetry.lock b/poetry.lock
index 8d9a3eb..182eaf0 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -446,18 +446,18 @@ plugins = ["setuptools"]
 
 [[package]]
 name = "jedi"
-version = "0.18.1"
+version = "0.17.2"
 description = "An autocompletion tool for Python that can be used for text editors."
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
 
 [package.dependencies]
-parso = ">=0.8.0,<0.9.0"
+parso = ">=0.7.0,<0.8.0"
 
 [package.extras]
-qa = ["flake8 (==3.8.3)", "mypy (==0.782)"]
-testing = ["Django (<3.1)", "colorama", "docopt", "pytest (<7.0.0)"]
+qa = ["flake8 (==3.7.9)"]
+testing = ["Django (<3.1)", "colorama", "docopt", "pytest (>=3.9.0,<5.0.0)"]
 
 [[package]]
 name = "jeepney"
@@ -652,15 +652,14 @@ pyparsing = ">=2.0.2"
 
 [[package]]
 name = "parso"
-version = "0.8.3"
+version = "0.7.1"
 description = "A Python Parser"
 category = "dev"
 optional = false
-python-versions = ">=3.6"
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
 
 [package.extras]
-qa = ["flake8 (==3.8.3)", "mypy (==0.782)"]
-testing = ["docopt", "pytest (<6.0.0)"]
+testing = ["docopt", "pytest (>=3.0.7)"]
 
 [[package]]
 name = "pastel"
@@ -987,7 +986,7 @@ requests = ">=2.0.1,<3.0.0"
 name = "ruamel.yaml"
 version = "0.17.20"
 description = "ruamel.yaml is a YAML parser/emitter that supports roundtrip preservation of comments, seq/map flow style, and map key order"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3"
 
@@ -1002,7 +1001,7 @@ jinja2 = ["ruamel.yaml.jinja2 (>=0.2)"]
 name = "ruamel.yaml.clib"
 version = "0.2.6"
 description = "C version of reader, parser and emitter for ruamel.yaml derived from libyaml"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.5"
 
@@ -1229,7 +1228,7 @@ testing = ["pytest (>=6)", "pytest-checkdocs (>=2.4)", "pytest-flake8", "pytest-
 [metadata]
 lock-version = "1.1"
 python-versions = "^3.7.0"
-content-hash = "c2231273382fdd702f8be1ae24709d0f409e240034d7ec9eb07507d05d7026ff"
+content-hash = "6d9d375399df38a2c9524fb111d165f30b3079db6ba4021434d76e6b5eebb783"
 
 [metadata.files]
 appnope = [
@@ -1488,8 +1487,8 @@ isort = [
     {file = "isort-5.10.1.tar.gz", hash = "sha256:e8443a5e7a020e9d7f97f1d7d9cd17c88bcb3bc7e218bf9cf5095fe550be2951"},
 ]
 jedi = [
-    {file = "jedi-0.18.1-py2.py3-none-any.whl", hash = "sha256:637c9635fcf47945ceb91cd7f320234a7be540ded6f3e99a50cb6febdfd1ba8d"},
-    {file = "jedi-0.18.1.tar.gz", hash = "sha256:74137626a64a99c8eb6ae5832d99b3bdd7d29a3850fe2aa80a4126b2a7d949ab"},
+    {file = "jedi-0.17.2-py2.py3-none-any.whl", hash = "sha256:98cc583fa0f2f8304968199b01b6b4b94f469a1f4a74c1560506ca2a211378b5"},
+    {file = "jedi-0.17.2.tar.gz", hash = "sha256:86ed7d9b750603e4ba582ea8edc678657fb4007894a12bcf6f4bb97892f31d20"},
 ]
 jeepney = [
     {file = "jeepney-0.7.1-py3-none-any.whl", hash = "sha256:1b5a0ea5c0e7b166b2f5895b91a08c14de8915afda4407fb5022a195224958ac"},
@@ -1643,8 +1642,8 @@ packaging = [
     {file = "packaging-20.9.tar.gz", hash = "sha256:5b327ac1320dc863dca72f4514ecc086f31186744b84a230374cc1fd776feae5"},
 ]
 parso = [
-    {file = "parso-0.8.3-py2.py3-none-any.whl", hash = "sha256:c001d4636cd3aecdaf33cbb40aebb59b094be2a74c556778ef5576c175e19e75"},
-    {file = "parso-0.8.3.tar.gz", hash = "sha256:8c07be290bb59f03588915921e29e8a50002acaf2cdc5fa0e0114f91709fafa0"},
+    {file = "parso-0.7.1-py2.py3-none-any.whl", hash = "sha256:97218d9159b2520ff45eb78028ba8b50d2bc61dcc062a9682666f2dc4bd331ea"},
+    {file = "parso-0.7.1.tar.gz", hash = "sha256:caba44724b994a8a5e086460bb212abc5a8bc46951bf4a9a1210745953622eb9"},
 ]
 pastel = [
     {file = "pastel-0.2.1-py2.py3-none-any.whl", hash = "sha256:4349225fcdf6c2bb34d483e523475de5bb04a5c10ef711263452cb37d7dd4364"},
diff --git a/pyproject.toml b/pyproject.toml
index 73ac78a..826eef9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,12 +34,13 @@ classifiers = [
 
 [tool.poetry.dependencies]
 python = "^3.7.0"
+"ruamel.yaml" = "^0.17.20"
 
 [tool.poetry.dev-dependencies]
 bandit = "^1.6.2"
-black = { version = "^21.9b0", allow-prereleases = true, python = "^3.7" }
+black = {version = "^21.12b0", allow-prereleases = true}
 blacken-docs = "^1.8.0"
-ipython = { version = "^7.18.1", python = "^3.7" }
+ipython = { version = "^7.18.1" }
 mypy = "^0.800"
 poetry = "^1.1.0"
 pre-commit = "^2.7.1"
@@ -51,7 +52,7 @@ reorder-python-imports = "^2.3.5"
 safety = "^1.9.0"
 toml = "^0.10.1"
 tox = "^3.20.0"
-tox-poetry-installer = { version = "^0.8.2", extras = ["poetry"] }
+tox-poetry-installer = { version = "^0.8.3", extras = ["poetry"] }
 mdformat = "^0.6.4"
 mdformat-gfm = "^0.2"