diff --git a/requirements.txt b/requirements.txt
index 36ab7e0..28dca37 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ numpy==1.15.2
 PyQt5>=5.9.3
 PyQt5-sip==4.19.13
 scipy==1.1.0
-vtk==8.1.1
+vtk==9.0.1
 control==0.8.2
 matplotlib==3.1.0
 sympy==1.3