diff --git a/requirements.txt b/requirements.txt
index 0901b05..809d0eb 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -75,7 +75,7 @@ libcst==1.8.2
 lxml==5.4.0
 markdown-it-py==3.0.0
 MarkupSafe==3.0.2
-marshmallow==3.18.0
+marshmallow==3.26.2
 mdurl==0.1.2
 mmh3==5.1.0
 monotonic==1.6