diff --git a/requirements.txt b/requirements.txt
index 32c2938a0346348556bc4ec42ae88ab05582104f..607563fd9042d68805c2be238ba982d62ba28974 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,7 +50,7 @@ requests==2.23.0
 scipy==1.4.1
 seaborn==0.10.0
 Shapely==1.7.0
-six==1.14.0
+six==1.11.0
 statsmodels==0.11.1
 tensorboard==1.12.2
 tensorflow==1.12.0