diff --git a/backend/requirements-ci.txt b/backend/requirements-ci.txt
index 21b5eb6..fa73bb8 100644
--- a/backend/requirements-ci.txt
+++ b/backend/requirements-ci.txt
@@ -50,7 +50,7 @@ scipy>=1.13.0
 statsmodels>=0.14.2
 scikit-learn>=1.5.0
 cvxopt==1.3.2
-arch==6.3.0
+arch==8.0.0
 yfinance==0.2.28
 ta==0.11.0
 
diff --git a/backend/requirements.txt b/backend/requirements.txt
index 46120a3..28ba8b2 100644
--- a/backend/requirements.txt
+++ b/backend/requirements.txt
@@ -47,7 +47,7 @@ scipy>=1.13.0
 statsmodels>=0.14.2
 scikit-learn>=1.5.0
 cvxopt==1.3.2
-arch==6.3.0
+arch==8.0.0
 yfinance==0.2.28
 ta==0.11.0