diff --git a/src/picture-submission/webapi/requirements.txt b/src/picture-submission/webapi/requirements.txt
index 5254f80..ac0892e 100644
--- a/src/picture-submission/webapi/requirements.txt
+++ b/src/picture-submission/webapi/requirements.txt
@@ -16,7 +16,7 @@ isodate==0.6.1
 itsdangerous==2.2.0
 Jinja2==3.1.4
 MarkupSafe==2.1.5
-marshmallow==3.22.0
+marshmallow==3.26.2
 msal==1.30.0
 msal-extensions==1.2.0
 mypy-extensions==1.0.0