diff --git a/requirements.txt b/requirements.txt
index 1bd9cff..cb1f6b8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,5 @@
 sqlalchemy<1.4
-marshmallow==3.2.1
+marshmallow==3.26.2
 marshmallow_jsonapi==0.24.0
 Flask>=1.0.1,<2
 apispec[yaml]>=4.3.0,<5