diff --git a/requirements_dev.txt b/requirements_dev.txt
index 3f86c4cf..b6efc292 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -1,11 +1,11 @@
 -e .
 bump2version==1.0.1
 wheel==0.36.2
-watchdog==2.1.2
+watchdog==2.1.3
 flake8==3.9.2
-tox==3.23.1
+tox==3.24.1
 coverage==5.5
-Sphinx==4.0.2
+Sphinx==4.1.2
 # only used for setup script
 # cryptography==1.0.1
 py==1.10.0