diff --git a/tox.ini b/tox.ini
index 99895477fc9f..5b00e9831c37 100644
--- a/tox.ini
+++ b/tox.ini
@@ -8,6 +8,7 @@ whitelist_externals = bash
 deps =
     flake8==3.3.0
     flake8-docstrings==1.1.0
+    pydocstyle==2.0.0
 
 [testenv:py33-lint]
 commands = bash .ci/flake8_py3_wrapper.sh
@@ -80,6 +81,7 @@ skip_install = True
 deps =
     flake8==3.3.0
     flake8-docstrings==1.1.0
+    pydocstyle==2.0.0
 
 
 [testenv:py27-lint-docstring-include-list]
@@ -89,3 +91,4 @@ skip_install = True
 deps =
     flake8==3.3.0
     flake8-docstrings==1.1.0
+    pydocstyle==2.0.0