diff --git a/requirements.txt b/requirements.txt
index a118856..6e66046 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -22,3 +22,4 @@
 urllib3>=1.21.1 # MIT
 debtcollector>=1.2.0 # Apache-2.0
 defusedxml>=0.7.1 # PSFL
+fasteners>=0.16.0 # Apache-2.0