diff --git a/tools/requirements.txt b/tools/requirements.txt
index b6be80271..23141093d 100644
--- a/tools/requirements.txt
+++ b/tools/requirements.txt
@@ -1,3 +1,4 @@
 ansicolors==1.1.8
 sslcrypto==5.3
-pexpect==4.8.0
\ No newline at end of file
+pexpect==4.8.0
+bitstring==4.1.2
\ No newline at end of file