diff --git a/requirements/base.txt b/requirements/base.txt
index 3f2557e..ff029f9 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -7,7 +7,7 @@ pandas>=2.2.0  # Data processing
 python-dotenv>=1.0.0  # Environment configuration
 tabulate>=0.9.0  # Table formatting
 cryptography>=46.0.5  # Cryptographic operations - security patches (updated 2026-03-02)
-openpyxl>=3.1.0  # Excel export (.xlsx format)
+openpyxl>=3.1.5  # Excel export (.xlsx format)
 
 # Note: Network libraries (requests, urllib3) intentionally excluded
 # This application processes sensitive financial data locally only