diff --git a/requirements-dev.txt b/requirements-dev.txt
index 8497475..748b9c4 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -19,9 +19,7 @@ astroid==2.5.6
 asttokens==2.0.5
     # via flake8-aaa
 astunparse==1.6.3
-    # via
-    #   -r docs/requirements.txt
-    #   pytkdocs
+    # via -r docs/requirements.txt
 attrs==20.3.0
     # via
     #   flake8-bugbear
@@ -41,7 +39,7 @@ beautifulsoup4==4.9.3
     # via
     #   -r docs/requirements.txt
     #   mkdocs-htmlproofer-plugin
-black==21.4b2
+black==21.5b0
     # via -r requirements-dev.in
 boto3==1.17.64
     # via -r requirements.txt
@@ -51,9 +49,7 @@ botocore==1.20.64
     #   boto3
     #   s3transfer
 cached-property==1.5.2
-    # via
-    #   -r docs/requirements.txt
-    #   pytkdocs
+    # via -r docs/requirements.txt
 certifi==2020.12.5
     # via
     #   -r docs/requirements.txt
@@ -183,18 +179,6 @@ importlib-metadata==4.0.1
     # via
     #   -r docs/requirements.txt
     #   -r requirements.txt
-    #   argcomplete
-    #   flake8
-    #   flake8-comprehensions
-    #   flake8-simplify
-    #   flake8-typing-imports
-    #   markdown
-    #   pep517
-    #   pluggy
-    #   pre-commit
-    #   pytest
-    #   stevedore
-    #   virtualenv
 iniconfig==1.1.1
     # via pytest
 isort==5.8.0
@@ -473,18 +457,12 @@ tqdm==4.60.0
 typed-ast==1.4.3
     # via
     #   -r docs/requirements.txt
-    #   astroid
-    #   black
-    #   flake8-annotations
     #   mypy
 typing-extensions==3.10.0.0
     # via
     #   -r docs/requirements.txt
     #   -r requirements.txt
-    #   black
-    #   importlib-metadata
     #   mypy
-    #   pytkdocs
 urllib3==1.26.4
     # via
     #   -r docs/requirements.txt
@@ -509,7 +487,6 @@ zipp==3.4.1
     #   -r docs/requirements.txt
     #   -r requirements.txt
     #   importlib-metadata
-    #   pep517
 
 # The following packages are considered to be unsafe in a requirements file:
 pip==21.1.1
@@ -521,4 +498,3 @@ setuptools==56.0.0
     #   flake8-variables-names
     #   ruyaml
     #   safety
-    #   yamllint