diff --git a/infrahub_sdk/pytest_plugin/items/graphql_query.py b/infrahub_sdk/pytest_plugin/items/graphql_query.py
index 3e196ac..769880b 100644
--- a/infrahub_sdk/pytest_plugin/items/graphql_query.py
+++ b/infrahub_sdk/pytest_plugin/items/graphql_query.py
@@ -40,7 +40,7 @@ def repr_failure(self, excinfo: ExceptionInfo, style: str | None = None) -> str:
             )
 
         if isinstance(excinfo.value, OutputMatchError):
-            return "\n".join([excinfo.value.message, excinfo.value.differences])
+            return f"{excinfo.value.message}\n{excinfo.value.differences}"
 
         return super().repr_failure(excinfo, style=style)
 
diff --git a/infrahub_sdk/pytest_plugin/items/jinja2_transform.py b/infrahub_sdk/pytest_plugin/items/jinja2_transform.py
index 48497c0..a5bba09 100644
--- a/infrahub_sdk/pytest_plugin/items/jinja2_transform.py
+++ b/infrahub_sdk/pytest_plugin/items/jinja2_transform.py
@@ -79,7 +79,7 @@ def repr_failure(self, excinfo: ExceptionInfo, style: str | None = None) -> str:
             return "\n".join(["Syntax error detected in the template", excinfo.value.message or ""])
 
         if isinstance(excinfo.value, OutputMatchError):
-            return "\n".join([excinfo.value.message, excinfo.value.differences])
+            return f"{excinfo.value.message}\n{excinfo.value.differences}"
 
         return super().repr_failure(excinfo, style=style)
 
diff --git a/infrahub_sdk/pytest_plugin/items/python_transform.py b/infrahub_sdk/pytest_plugin/items/python_transform.py
index b597bed..a030f8a 100644
--- a/infrahub_sdk/pytest_plugin/items/python_transform.py
+++ b/infrahub_sdk/pytest_plugin/items/python_transform.py
@@ -62,7 +62,7 @@ def repr_failure(self, excinfo: ExceptionInfo, style: str | None = None) -> str:
             )
 
         if isinstance(excinfo.value, OutputMatchError):
-            return "\n".join([excinfo.value.message, excinfo.value.differences])
+            return f"{excinfo.value.message}\n{excinfo.value.differences}"
 
         return super().repr_failure(excinfo, style=style)
 
diff --git a/pyproject.toml b/pyproject.toml
index 646a276..4a9d8b9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -222,7 +222,6 @@ ignore = [
     "TID",    # flake8-tidy-imports
     "FBT",    # flake8-boolean-trap
     "G",      # flake8-logging-format
-    "FLY",    # flynt
     "RSE",    # flake8-raise
     "BLE",    # flake8-blind-except (BLE)
     "A",      # flake8-builtins