diff --git a/requirements.txt b/requirements.txt
index 84043ff..3886f7c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,5 @@
 alembic==1.17.0
+altcha==0.2.0
 annotated-types==0.7.0
 anyio==4.11.0
 argon2-cffi==23.1.0