diff --git a/requirements-app.txt b/requirements-app.txt
index 883e4307e..dcfb279e1 100644
--- a/requirements-app.txt
+++ b/requirements-app.txt
@@ -16,7 +16,7 @@ iso8601==0.1.12
 itsdangerous==1.1.0
 jsonschema==3.2.0
 marshmallow-sqlalchemy==0.23.0
-marshmallow==2.20.5 # pyup: <3 # v3 throws errors
+marshmallow==2.21.0 # pyup: <3 # v3 throws errors
 psycopg2-binary==2.8.4
 PyJWT==1.7.1
 SQLAlchemy==1.3.13
diff --git a/requirements.txt b/requirements.txt
index d25f87cc5..c66a022d8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -18,7 +18,7 @@ iso8601==0.1.12
 itsdangerous==1.1.0
 jsonschema==3.2.0
 marshmallow-sqlalchemy==0.23.0
-marshmallow==2.20.5 # pyup: <3 # v3 throws errors
+marshmallow==2.21.0 # pyup: <3 # v3 throws errors
 psycopg2-binary==2.8.4
 PyJWT==1.7.1
 SQLAlchemy==1.3.13