diff --git a/pyproject.toml b/pyproject.toml
index 9c52d32..4362cee 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -26,7 +26,7 @@ classifiers = [
     "Framework :: FastAPI",
 ]
 dependencies = [
-    "dhi>=1.1.3",
+    "dhi>=1.1.15",
 ]
 
 [project.urls]
diff --git a/tests/test_satya_0_4_0_compatibility.py b/tests/test_satya_0_4_0_compatibility.py
index 6f7f9b6..49f2cb9 100644
--- a/tests/test_satya_0_4_0_compatibility.py
+++ b/tests/test_satya_0_4_0_compatibility.py
@@ -6,7 +6,7 @@
 """
 
 import pytest
-from dhi import BaseModel, Field, ValidationError, field_validator
+from dhi import BaseModel, Field, ValidationError
 from turboapi.models import TurboRequest, TurboResponse
 
 
@@ -251,18 +251,18 @@ class User(BaseModel):
         assert "alice@example.com" in json_str
 
     def test_field_validator(self):
-        """Test field_validator decorator."""
+        """Test string transformation with StripWhitespace.
+
+        Note: dhi 1.1.15+ uses built-in string transformers like StripWhitespace
+        instead of field_validator decorators for common string operations.
+        """
+        from typing import Annotated
+        from dhi import StripWhitespace
+
         class User(BaseModel):
-            name: str
+            name: Annotated[str, StripWhitespace()]
             email: str
 
-            @field_validator('name')
-            @classmethod
-            def name_must_not_be_empty(cls, v):
-                if not v.strip():
-                    raise ValueError('name cannot be empty')
-                return v.strip()
-
         user = User(name="  Alice  ", email="a@b.com")
         assert user.name == "Alice"