diff --git a/mcp-server/requirements.txt b/mcp-server/requirements.txt
index 0eee8fb..4f76817 100644
--- a/mcp-server/requirements.txt
+++ b/mcp-server/requirements.txt
@@ -15,7 +15,7 @@ fastembed==0.3.0
 pypdf==5.0.0
 
 # Environment variables loader
-python-dotenv==1.0.0
+python-dotenv>=1.1.0,<2.0
 
 # YAML parser for sources configuration
 PyYAML==6.0.1