diff --git a/stochastic_processes_data_analysis/requirements.txt b/stochastic_processes_data_analysis/requirements.txt
index cce635c..28284a1 100644
--- a/stochastic_processes_data_analysis/requirements.txt
+++ b/stochastic_processes_data_analysis/requirements.txt
@@ -51,7 +51,7 @@ Send2Trash==1.5.0
 six==1.15.0
 terminado==0.9.1
 testpath==0.4.4
-tornado==6.1
+tornado==6.4.2
 traitlets==5.0.5
 wcwidth==0.2.5
 webencodings==0.5.1