diff --git a/requirements.txt b/requirements.txt
--- a/requirements.txt
+++ b/requirements.txt
@@ -46,3 +46,4 @@ https://github.com/drewp/cyclone/archive
 cycloneerr==0.3.0
 rdfdb==0.20.0
 standardservice==0.6.0
+pyftdi==0.29.4