diff --git a/requirements_2.6.1.txt b/requirements_2.6.1.txt
index 91a472cc..307baecd 100644
--- a/requirements_2.6.1.txt
+++ b/requirements_2.6.1.txt
@@ -99,7 +99,7 @@ Mako==1.2.4
 Markdown==3.4.3
 markdown-it-py==2.2.0
 MarkupSafe==2.1.3
-marshmallow==3.19.0
+marshmallow==3.26.2
 marshmallow-enum==1.5.1
 marshmallow-oneofschema==3.0.1
 marshmallow-sqlalchemy==0.26.1
diff --git a/requirements_2.6.2.txt b/requirements_2.6.2.txt
index 37420244..0ddb5955 100644
--- a/requirements_2.6.2.txt
+++ b/requirements_2.6.2.txt
@@ -97,7 +97,7 @@ Mako==1.2.4
 Markdown==3.4.3
 markdown-it-py==3.0.0
 MarkupSafe==2.1.3
-marshmallow==3.19.0
+marshmallow==3.26.2
 marshmallow-enum==1.5.1
 marshmallow-oneofschema==3.0.1
 marshmallow-sqlalchemy==0.26.1
diff --git a/requirements_v2.10.4.txt b/requirements_v2.10.4.txt
index 7df81933..97111b42 100644
--- a/requirements_v2.10.4.txt
+++ b/requirements_v2.10.4.txt
@@ -119,7 +119,7 @@ lxml==5.3.0
 Mako==1.3.8
 markdown-it-py==3.0.0
 MarkupSafe==3.0.2
-marshmallow==3.23.1
+marshmallow==3.26.2
 marshmallow-oneofschema==3.1.1
 marshmallow-sqlalchemy==0.28.2
 matplotlib==3.10.0