diff --git a/requirements.txt b/requirements.txt
index f0ed46e..0281276 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@
 #    pip-compile --output-file requirements.txt requirements.in
 #
 click==6.7                # via flask
-flask==0.12
+flask==1.1.1
 itsdangerous==0.24        # via flask
 jinja2==2.9.4             # via flask
 markupsafe==0.23          # via jinja2