diff --git a/requirements.txt b/requirements.txt
index c0953b160..7c6769f19 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -124,7 +124,7 @@ requests==2.32.2
     #   sphinx
 requests-cache==1.2.0
     # via ocdsextensionregistry
-six==1.11.0
+six==1.17.0
     # via url-normalize
 snowballstemmer==2.0.0
     # via sphinx
diff --git a/requirements_dev.txt b/requirements_dev.txt
index 5f6d1df80..ce4b46038 100644
--- a/requirements_dev.txt
+++ b/requirements_dev.txt
@@ -181,7 +181,7 @@ requests-cache==1.2.0
     # via
     #   -r requirements.txt
     #   ocdsextensionregistry
-six==1.11.0
+six==1.17.0
     # via
     #   -r requirements.txt
     #   libsass