diff --git a/src/backend/base/pyproject.toml b/src/backend/base/pyproject.toml
index 82a037521..ea95f26be 100644
--- a/src/backend/base/pyproject.toml
+++ b/src/backend/base/pyproject.toml
@@ -85,6 +85,7 @@ dependencies = [
     "sqlalchemy[aiosqlite]>=2.0.38,<3.0.0",
     "elevenlabs>=1.54.0",
     "webrtcvad>=2.0.10",
+    "scipy>=1.15.2",
 ]
 
 [dependency-groups]
diff --git a/uv.lock b/uv.lock
index fa4c03400..bcc131a42 100644
--- a/uv.lock
+++ b/uv.lock
@@ -4815,6 +4815,7 @@ dependencies = [
     { name = "python-jose" },
     { name = "python-multipart" },
     { name = "rich" },
+    { name = "scipy" },
     { name = "sentry-sdk", extra = ["fastapi", "loguru"] },
     { name = "setuptools" },
     { name = "spider-client" },
@@ -4958,6 +4959,7 @@ requires-dist = [
     { name = "redis", marker = "extra == 'all'", specifier = ">=4.6.0" },
     { name = "redis", marker = "extra == 'deploy'", specifier = ">=4.6.0" },
     { name = "rich", specifier = ">=13.7.0,<14.0.0" },
+    { name = "scipy", specifier = ">=1.15.2" },
     { name = "sentence-transformers", marker = "extra == 'all'", specifier = ">=2.0.0" },
     { name = "sentence-transformers", marker = "extra == 'local'", specifier = ">=2.0.0" },
     { name = "sentry-sdk", extras = ["fastapi", "loguru"], specifier = ">=2.5.1,<3.0.0" },