diff --git a/.appveyor.yml b/.appveyor.yml
index 560516cfb..61afd8f5f 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -47,6 +47,7 @@ install:
   - cinst gsutil
   - cinst openssl.light
   - wget --no-check-certificate https://github.com/dpinney/omf/raw/master/omf/static/pygraphviz-1.3.1-cp27-none-win32.whl
+  - pip install --upgrade pip
   - pip install pygraphviz-1.3.1-cp27-none-win32.whl
   - pip install -r requirements.txt
   - python setup.py install