diff --git a/Chapter04/requirements.txt b/Chapter04/requirements.txt
index 623d42a..0c4d675 100644
--- a/Chapter04/requirements.txt
+++ b/Chapter04/requirements.txt
@@ -1,2 +1,2 @@
-sanic==0.7.0
+sanic==20.12.7
 pycryptodome==3.4.11