diff --git a/src/allmydata/_auto_deps.py b/src/allmydata/_auto_deps.py
index 71e154683..b7be32128 100644
--- a/src/allmydata/_auto_deps.py
+++ b/src/allmydata/_auto_deps.py
@@ -29,10 +29,7 @@ install_requires = [
     # * The SFTP frontend depends on Twisted 11.0.0 to fix the SSH server
     #   rekeying bug http://twistedmatrix.com/trac/ticket/4395
     #
-    # service_identity allows Twisted to do cert checking.
-    #
     "Twisted >= 11.0.0",
-    "service_identity",
 
     # * foolscap < 0.5.1 had a performance bug which spent O(N**2) CPU for
     #   transferring large mutable files of size N.