diff --git a/stimulus/requirements.txt b/stimulus/requirements.txt
index abfbb4c..c28a566 100644
--- a/stimulus/requirements.txt
+++ b/stimulus/requirements.txt
@@ -36,7 +36,7 @@ pandas==0.24.2
 pbr==5.1.3
 Pillow==5.4.1
 proglog==0.1.9
-psutil==5.6.1
+psutil==5.6.6
 PsychoPy==3.0.7
 pycparser==2.19
 pygame==1.9.4