diff --git a/pyproject.toml b/pyproject.toml
index b9ce827..618a6a2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,6 +24,7 @@ classifiers = [
 ]
 
 requires = [
+    "deform >= 2.0.8",
     "passlib[argon2,bcrypt] >= 1.7.2",
     "pyramid >= 1.10",
     "pyramid_debugtoolbar >= 4.6.1",