diff --git a/appveyor.yml b/appveyor.yml
index 1fc67cc0..41cde625 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -3,7 +3,7 @@ version: '{branch}-{build}'
 install:
   - "SET PATH=C:\\Python27-x64;C:\\Python27-x64\\Scripts;%PATH%"
   - "python --version"
-  - "pip install tox==2.1.1 virtualenv==13.1.2"
+  - "pip install tox==2.7.0 virtualenv==15.1.0"
 
 # Build the binary after tests
 build: false