diff --git a/dev-requirements.txt b/dev-requirements.txt
index db04ebd..f32f6a7 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -11,7 +11,7 @@ aspy.yaml==1.3.0          # via pre-commit
 astroid==2.2.5            # via pylint
 atomicwrites==1.3.0       # via pytest
 attrs==19.1.0             # via black, pytest
-black==19.3b0
+black==19.10b0
 bleach==3.1.0             # via readme-renderer
 bump2version==0.5.10
 certifi==2019.6.16        # via requests
@@ -40,6 +40,7 @@ mypy-extensions==0.4.1    # via mypy
 mypy==0.730
 nodeenv==1.3.3            # via pre-commit
 packaging==19.0           # via pytest, pytest-sugar, tox
+pathspec==0.6.0           # via black
 pathtools==0.1.2          # via watchdog
 pex==1.6.11
 pkginfo==1.5.0.1          # via twine
@@ -57,6 +58,7 @@ pytest-sugar==0.9.2
 pytest==5.1.1
 pyyaml==5.1.1             # via aspy.yaml, pre-commit, watchdog
 readme-renderer==24.0
+regex==2019.8.19          # via black
 requests-toolbelt==0.9.1  # via twine
 requests==2.22.0          # via requests-toolbelt, twine
 six==1.12.0               # via astroid, bleach, cfgv, cuvner, packaging, pre-commit, readme-renderer, tox
@@ -66,7 +68,7 @@ towncrier==19.2.0
 tox==3.14.0
 tqdm==4.32.2              # via twine
 twine==2.0.0
-typed-ast==1.4.0          # via astroid, mypy
+typed-ast==1.4.0          # via astroid, black, mypy
 typing-extensions==3.7.4  # via mypy
 unidiff==0.5.5            # via cuvner
 urllib3==1.25.3           # via requests
@@ -80,4 +82,4 @@ wrapt==1.11.2             # via astroid
 zipp==0.5.2               # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file:
-# setuptools==41.4.0        # via twine
+# setuptools==41.5.1        # via twine