diff --git a/filip/models/base.py b/filip/models/base.py
index 0f9dbd0c..8373803a 100644
--- a/filip/models/base.py
+++ b/filip/models/base.py
@@ -104,7 +104,7 @@ class FiwareHeaderSecure(FiwareHeader):
         default="",
         max_length=3000,
         description="authorization key",
-        regex=r".*"
+        pattern=r".*"
     )
 
 
@@ -129,4 +129,4 @@ def _missing_name_(cls, name):
         """
         for member in cls:
             if member.value.casefold() == name.casefold():
-                return member
\ No newline at end of file
+                return member