diff --git a/python/pymodbus/examples/gui/bottle/requirements.txt b/python/pymodbus/examples/gui/bottle/requirements.txt
index 13c9972..15dc32f 100644
--- a/python/pymodbus/examples/gui/bottle/requirements.txt
+++ b/python/pymodbus/examples/gui/bottle/requirements.txt
@@ -1,4 +1,4 @@
 # -------------------------------------------------------------------
 # if you want to use this frontend uncomment these
 # -------------------------------------------------------------------
-bottle==0.12.19
+bottle==0.12.20