diff --git a/lower-constraints.txt b/lower-constraints.txt
index adc125d..97500de 100644
--- a/lower-constraints.txt
+++ b/lower-constraints.txt
@@ -57,7 +57,6 @@ Mako==1.0.7
 MarkupSafe==1.1.0
 mccabe==0.5.3
 microversion-parse==0.2.1
-mock==2.0.0
 monotonic==1.5
 mox3==0.26.0
 msgpack==0.6.1