diff --git a/tildes/requirements-to-freeze.txt b/tildes/requirements-to-freeze.txt
index c773e68..5730976 100644
--- a/tildes/requirements-to-freeze.txt
+++ b/tildes/requirements-to-freeze.txt
@@ -16,7 +16,7 @@ Pillow
 prometheus-client
 prospector
 psycopg2
-publicsuffix2
+publicsuffix2==2.20160818
 Pygments
 pyotp
 pyramid