diff --git a/packages/bookwyrm/package.nix b/packages/bookwyrm/package.nix
index a87b5f4..6281263 100644
--- a/packages/bookwyrm/package.nix
+++ b/packages/bookwyrm/package.nix
@@ -71,9 +71,10 @@ mkDerivation {
 			python-crontab
 			python-dateutil
 			python-dotenv
-			redis
+			redis  # The Python module
 			requests
 			s3-tar
+			s3transfer
 			six
 			sqlparse
 			typing-extensions