diff --git a/requirements/base.txt b/requirements/base.txt
index 829dc3b7..ec8d526d 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -7,5 +7,6 @@ PyQt5>=5.15,<5.16
 pyqt5ac>=1.2,<1.3
 python-slugify>=4.0,<8.1
 pyyaml>=5.4,<6.1
+six>=1.16.0
 transifex-python>=3.2,<4.0
 toml>=0.10.2