diff --git a/setup.py b/setup.py
index f5eebc4c870e11b5c4dc3e14e8a04166d0f1e1ff..ada9e83107b136e6ccf16c81812cbea74df104a8 100644
--- a/setup.py
+++ b/setup.py
@@ -104,7 +104,7 @@ requires_test = [
 	"pytest==5.3.2",
 	"python-dateutil==2.8.1",
 	"python-editor==1.0.4",
-	"six==1.13.0",
+	"six==1.15.0"
 	"sqlalchemy-utils==0.36.8",
 	"sqlalchemy==1.4.5",
 	"toml==0.10.2",
@@ -142,7 +142,7 @@ requires_docs = [
 	"python-dateutil==2.8.1",
 	"pytz==2021.1",
 	"requests==2.25.1",
-	"six==1.13.0",
+	"six==1.15.0",
 	"snowballstemmer==2.1.0",
 	"speaklater==1.3",
 	"sphinx==3.4.3",
@@ -286,7 +286,7 @@ requires_install = [
 	"scipy==1.6.0",
 	"semver==2.13.0",
 	"simplejson==3.17.2",
-	"six==1.13.0",
+	"six==1.15.0",
 	"snowballstemmer==2.1.0",
 	"speaklater==1.3",
 	"sphinx==3.4.3",