diff --git a/requirements_dev.txt b/requirements_dev.txt
index 2b5fbe2..bc4ae5b 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,11 +1,11 @@
 bumpversion==0.5.3
 wheel==0.33.6
 watchdog==0.9.0
-flake8==3.7.8
-tox==3.13.2
-Sphinx==2.2.0
+flake8==3.7.9
+tox==3.14.0
+Sphinx==2.2.1
 coverage==4.5.4
-cryptography==2.7
+cryptography==2.8
 PyYAML==5.1.2
-pytest==5.1.2
-pytest-runner==5.1
\ No newline at end of file
+pytest==5.2.2
+pytest-runner==5.2
\ No newline at end of file