diff --git a/machine_learning_algorithms_from_scratch/code/lda/app-tic-tac-toe/requirements.txt b/machine_learning_algorithms_from_scratch/code/lda/app-tic-tac-toe/requirements.txt
index 8a61f5c..72fe920 100644
--- a/machine_learning_algorithms_from_scratch/code/lda/app-tic-tac-toe/requirements.txt
+++ b/machine_learning_algorithms_from_scratch/code/lda/app-tic-tac-toe/requirements.txt
@@ -14,6 +14,6 @@ coverage==3.7.1
 decorator==3.4.0
 flipflop==1.0
 guess-language==0.2
-gunicorn==19.1.1
+gunicorn==19.5.0
 pbr==0.10.0
 python-openid==2.2.5