diff --git a/samples/microphone/requirements.txt b/samples/microphone/requirements.txt
index 15c2443c..3a75f340 100644
--- a/samples/microphone/requirements.txt
+++ b/samples/microphone/requirements.txt
@@ -1,4 +1,4 @@
 google-cloud-speech==1.3.2
 pyaudio==0.2.11
-six==1.13.0
+six==1.14.0