diff --git a/requirements.txt b/requirements.txt
index 817e6f0..3ccf643 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ cryptography==46.0.5
 flask-apispec==0.11.4
 launchpadlib==2.1.0
 macaroonbakery==1.3.4
-marshmallow==3.20.2
+marshmallow==3.26.2
 python-dateutil==2.8.2
 psycopg2-binary==2.9.9
 requests-oauthlib==2.0.0