diff --git a/requirements-dev.txt b/requirements-dev.txt
index eb2e541..dd067b0 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -11,7 +11,7 @@ argh==0.26.2              # via sphinx-autobuild, watchdog
 atomicwrites==1.1.5       # via pytest
 attrs==18.1.0             # via black, pytest
 babel==2.6.0              # via sphinx
-black==18.6b4
+black==19.3b0
 bumpversion==0.5.3
 certifi==2018.4.16        # via requests
 chardet==3.0.4            # via doc8, requests
@@ -34,7 +34,7 @@ pbr==4.2.0                # via stevedore
 pep8==1.7.1               # via pytest-pep8
 pkginfo==1.4.2            # via twine
 pluggy==0.7.1             # via pytest, tox
-port-for==0.3.1           # via sphinx-autobuild
+port_for==0.3.1           # via sphinx-autobuild
 py==1.5.4                 # via pytest, tox
 pycodestyle==2.3.1
 pyflakes==1.6.0           # via flake8, pytest-flakes
@@ -46,7 +46,7 @@ pytest-flakes==4.0.0
 pytest-pep8==1.0.6
 pytest==3.7.0
 pytz==2018.5              # via babel
-pyyaml==3.13              # via sphinx-autobuild, watchdog
+pyyaml==5.1               # via sphinx-autobuild, watchdog
 requests-toolbelt==0.8.0  # via twine
 requests==2.19.1          # via requests-toolbelt, sphinx, twine
 restructuredtext-lint==1.1.3  # via doc8