diff --git a/requirements.txt b/requirements.txt
index d86bb32..82ac3a3 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,4 +7,4 @@ pytest-cov==2.7.1
 python-coveralls==2.9.3
 git+https://github.com/sreynen/pywell@main#egg=pywell
 slackweb==1.0.5
-zappa==0.48.2
+zappa==0.51.0