diff --git a/setup.py b/setup.py
index feea42a..62af4e3 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 
 # What packages are required for this module to be executed?
 REQUIRED = [
-    'marshmallow==3.4.0',
+    'marshmallow==3.26.2',
     'xmltodict']
 
 # What packages are optional?