diff --git a/requirements-dev.txt b/requirements-dev.txt
index e85f920c..119b73ec 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -6,27 +6,27 @@
 #
 appdirs==1.4.4            # via black
 attrs==21.2.0             # via black, pytest
-black==21.7b0            # via -r requirements-dev.in
+black==21.8b0            # via -r requirements-dev.in
 click==8.0.1              # via black
 coverage==5.5           # via -r requirements-dev.in
 entrypoints==0.3          # via flake8
 flake8==3.9.2             # via -r requirements-dev.in
 isort[pyproject]==5.9.3  # via -r requirements-dev.in
 mccabe==0.6.1             # via flake8
-more-itertools==8.8.0     # via pytest
+more-itertools==8.9.0     # via pytest
 mypy-extensions==0.4.3    # via mypy
 mypy==0.910               # via -r requirements-dev.in
 packaging==21.0           # via pytest
 pathspec==0.9.0           # via black
-pluggy==0.13.1            # via pytest
+pluggy==1.0.0            # via pytest
 py==1.10.0                 # via pytest
 pycodestyle==2.7.0        # via flake8
 pyflakes==2.3.1           # via flake8
 pyparsing==2.4.7          # via packaging
-pytest==6.2.4             # via -r requirements-dev.in
-regex==2021.8.21          # via black
+pytest==6.2.5             # via -r requirements-dev.in
+regex==2021.8.28          # via black
 six==1.16.0               # via packaging
 toml==0.10.2              # via black, isort
 typed-ast==1.4.3          # via black, mypy
-typing-extensions==3.10.0.0  # via mypy
+typing-extensions==3.10.0.2  # via mypy
 wcwidth==0.2.5            # via pytest