diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9951e2c..b78df13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@
   pinned `attrs==18.2` in `requirements-dev.txt because of an issue with
   pytest. See https://stackoverflow.com/a/58189684/1354930. (#175)
 + Added pre-commit (#177)
++ The `werkzeug` dependency was pinned to v0.15.4.
 
 
 ## 0.6.0b2 (2019-06-27)
diff --git a/requirements.txt b/requirements.txt
index 161c177..4f299e6 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -7,3 +7,4 @@ loguru==0.2.5
 marshmallow==2.19.5
 marshmallow-peewee==2.2.0
 flask-rest-api==0.14.0
+werkzeug==0.15.4