diff --git a/requirements.txt b/requirements.txt
index 9c217ad..50f35fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -50,7 +50,7 @@ tensorflow==1.8.0
 
 # Forcing bleach to 1.5 to avoid version incompatibility when installing
 # TensorBoard.
-bleach==1.5.0
+bleach==3.1.4
 
 Keras==2.1.6