diff --git a/requirements.txt b/requirements.txt
index 2283e5f3e..a3392f727 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@ configparser>=3.5.0
 zc.lockfile>=1.2.1
 future>=0.16.0
 google-cloud>=0.24.0
-PyInstaller>=3.2.1
+PyInstaller==3.3.1
 colorama>=0.3.9
 configobj>=5.0.6
 networkx>=1.11