diff --git a/conans/requirements.txt b/conans/requirements.txt
index aa9bc09b2f6..e8dc15a3c18 100644
--- a/conans/requirements.txt
+++ b/conans/requirements.txt
@@ -5,7 +5,7 @@ colorama>=0.3.3, <0.5.0
 PyYAML>=3.11, <6.0
 patch-ng>=1.17.4, <1.18
 fasteners>=0.14.1
-six>=1.10.0,<=1.15.0
+six>=1.10.0,<=1.16.0
 node-semver==0.6.1
 distro>=1.0.2, <=1.5.0
 future>=0.16.0, <0.19.0