diff --git a/backend/requirements.txt b/backend/requirements.txt
index 5871015075..1ea3128cb8 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -2,6 +2,7 @@ fastapi==0.115.7
 uvicorn[standard]==0.35.0
 pydantic==2.11.7
 python-multipart==0.0.20
+isdangerous==2.2.0
 
 python-socketio==5.13.0
 python-jose==3.4.0
diff --git a/pyproject.toml b/pyproject.toml
index 4bbaf85b6b..267d8a7c60 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,6 +10,7 @@ dependencies = [
     "uvicorn[standard]==0.35.0",
     "pydantic==2.11.7",
     "python-multipart==0.0.20",
+    "isdangerous==2.2.0",
 
     "python-socketio==5.13.0",
     "python-jose==3.4.0",