diff --git a/dev-requirements.txt b/dev-requirements.txt
index e7e1fc0..8ce2493 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,31 +1,31 @@
 argh~=0.26.2
 atomicwrites~=1.3.0
 attrs~=19.1.0
-certifi~=2019.3.9
+certifi==2019.9.11
 chardet~=3.0.4
 codacy-coverage~=1.3.11
 codeclimate-test-reporter~=0.2.3
 colorama~=0.4.1
 colored~=1.3.93
-coverage~=4.5.3
+coverage==4.5.4
 docopt~=0.6.2
 idna~=2.8
-more-itertools~=7.0.0
+more-itertools==7.2.0
 pathlib~=1.0.1
 pathtools~=0.1.2
-pip~=19.0.3
+pip==19.2.3
 pluggy>=0.9.0
 py~=1.8.0
 pycodestyle~=2.5.0
-pytest~=4.4.0
-pytest-cov~=2.6.1
+pytest==5.2.0
+pytest-cov==2.7.1
 pytest-watch~=4.2.0
 pyyaml>=4.2b1
-requests~=2.21.0
-setuptools~=40.8.0
+requests==2.22.0
+setuptools==41.2.0
 six~=1.12.0
-urllib3~=1.24.1
+urllib3==1.25.6
 watchdog~=0.9.0
-wheel~=0.33.1
+wheel==0.33.6
 
-twine~=1.13.0
+twine==2.0.0