diff --git a/src/nwp500/auth.py b/src/nwp500/auth.py
index 6e4e451..08fcded 100644
--- a/src/nwp500/auth.py
+++ b/src/nwp500/auth.py
@@ -447,7 +447,10 @@ async def sign_in(
 
         except aiohttp.ClientError as e:
             _logger.error(f"Network error during sign-in: {e}")
-            raise AuthenticationError(f"Network error: {str(e)}") from e
+            raise AuthenticationError(
+                f"Network error: {str(e)}",
+                retriable=True,
+            ) from e
         except (KeyError, ValueError, json.JSONDecodeError) as e:
             _logger.error(f"Failed to parse authentication response: {e}")
             raise AuthenticationError(
@@ -545,7 +548,10 @@ async def refresh_token(
 
         except aiohttp.ClientError as e:
             _logger.error(f"Network error during token refresh: {e}")
-            raise TokenRefreshError(f"Network error: {str(e)}") from e
+            raise TokenRefreshError(
+                f"Network error: {str(e)}",
+                retriable=True,
+            ) from e
         except (KeyError, ValueError, json.JSONDecodeError) as e:
             _logger.error(f"Failed to parse refresh response: {e}")
             raise TokenRefreshError(f"Invalid response format: {str(e)}") from e