diff --git a/src/dotenv/main.py b/src/dotenv/main.py
index 1848d602..96da29a5 100644
--- a/src/dotenv/main.py
+++ b/src/dotenv/main.py
@@ -317,8 +317,7 @@ def _is_debugger():
             return check_path
 
     if raise_error_if_not_found:
-        raise IOError("File not found")
-
+        raise FileNotFoundError("File not found")
     return ""