diff --git a/setup.py b/setup.py
index f90f30d..eafad10 100644
--- a/setup.py
+++ b/setup.py
@@ -29,7 +29,6 @@
     # Until this issue is closed
     # https://github.com/googleapis/google-cloud-python/issues/10566
     "google-api-core[grpc] >= 1.28.0, <3.0.0dev",
-    "libcst >= 0.2.5",
     "proto-plus >= 1.4.0",
 ]
 
diff --git a/testing/constraints-3.6.txt b/testing/constraints-3.6.txt
index 2aef716..8fad4fc 100644
--- a/testing/constraints-3.6.txt
+++ b/testing/constraints-3.6.txt
@@ -20,5 +20,4 @@
 # e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
 # Then this file should have foo==1.14.0
 google-api-core==1.28.0
-libcst==0.2.5
 proto-plus==1.4.0