diff --git a/tox.ini b/tox.ini
index 85cf40aaf..3691eadf7 100644
--- a/tox.ini
+++ b/tox.ini
@@ -44,7 +44,7 @@ commands =
 passenv = TRAVIS_* APPVEYOR_* AWS_* TWINE_* DOCKER_* RTOOL_KEY WHEEL DOCKER PYINSTALLER WININSTALLER
 deps =
   -rrequirements.txt
-  pyinstaller==3.4
+  pyinstaller==3.5
   twine==1.12.1
   awscli
 commands =