diff --git a/README.md b/README.md
index 191e608..a9daf8a 100644
--- a/README.md
+++ b/README.md
@@ -181,7 +181,7 @@ Launch the application and access the Settings menu to configure:
 - **Window Tab** - Configure window dimensions
 - **Profiles Tab** - Save/load/export-import configuration profiles
 
-Profiles are saved in `~/.webdrop-bridge/profiles/`
+Profiles are saved in `~/.webdrop_bridge/profiles/`
 
 ### 2. Environment Variables
 Create a `.env` file in the project root. Available settings:
diff --git a/src/webdrop_bridge/core/config_manager.py b/src/webdrop_bridge/core/config_manager.py
index aeedf81..52798ee 100644
--- a/src/webdrop_bridge/core/config_manager.py
+++ b/src/webdrop_bridge/core/config_manager.py
@@ -101,10 +101,10 @@ class ConfigValidator:
 class ConfigProfile:
     """Manages named configuration profiles.
 
-    Profiles are stored in ~/.webdrop-bridge/profiles/ directory as JSON files.
+    Profiles are stored in ~/.webdrop_bridge/profiles/ directory as JSON files.
     """
 
-    PROFILES_DIR = Path.home() / ".webdrop-bridge" / "profiles"
+    PROFILES_DIR = Path.home() / ".webdrop_bridge" / "profiles"
 
     def __init__(self) -> None:
         """Initialize profile manager."""
diff --git a/src/webdrop_bridge/ui/main_window.py b/src/webdrop_bridge/ui/main_window.py
index b6d3b64..ce751fb 100644
--- a/src/webdrop_bridge/ui/main_window.py
+++ b/src/webdrop_bridge/ui/main_window.py
@@ -1410,7 +1410,7 @@ class MainWindow(QMainWindow):
 
         try:
             # Create update manager
-            cache_dir = Path.home() / ".webdrop-bridge"
+            cache_dir = Path.home() / ".webdrop_bridge"
             manager = UpdateManager(current_version=self.config.app_version, config_dir=cache_dir)
 
             # Run async check in background
@@ -1630,7 +1630,7 @@ class MainWindow(QMainWindow):
 
             # Create update manager
             manager = UpdateManager(
-                current_version=self.config.app_version, config_dir=Path.home() / ".webdrop-bridge"
+                current_version=self.config.app_version, config_dir=Path.home() / ".webdrop_bridge"
             )
 
             # Create and start background thread
@@ -1769,7 +1769,7 @@ class MainWindow(QMainWindow):
         from webdrop_bridge.core.updater import UpdateManager
 
         manager = UpdateManager(
-            current_version=self.config.app_version, config_dir=Path.home() / ".webdrop-bridge"
+            current_version=self.config.app_version, config_dir=Path.home() / ".webdrop_bridge"
         )
 
         if manager.install_update(installer_path):
diff --git a/src/webdrop_bridge/ui/restricted_web_view.py b/src/webdrop_bridge/ui/restricted_web_view.py
index a8359a4..5969819 100644
--- a/src/webdrop_bridge/ui/restricted_web_view.py
+++ b/src/webdrop_bridge/ui/restricted_web_view.py
@@ -150,13 +150,13 @@ class RestrictedWebEngineView(QWebEngineView):
         )
 
         # Create profile directory path
-        profile_path = Path(app_data_dir) / "WebEngineProfile"
+        profile_path = Path(app_data_dir) / "webdrop_bridge"
         profile_path.mkdir(parents=True, exist_ok=True)
 
         # Create persistent profile with custom storage location
-        # Using "WebDropBridge" as the profile name
+        # Using "webdrop_bridge" as the profile name
         # Note: No parent specified so we control the lifecycle
-        profile = QWebEngineProfile("WebDropBridge")
+        profile = QWebEngineProfile("webdrop_bridge")
         profile.setPersistentStoragePath(str(profile_path))
 
         # Configure persistent cookies (critical for authentication)