diff --git a/tests/models/test_fallback.py b/tests/models/test_fallback.py
index 89709d4a2e..2b5b5a781e 100644
--- a/tests/models/test_fallback.py
+++ b/tests/models/test_fallback.py
@@ -3,6 +3,7 @@
 import sys
 from collections.abc import AsyncIterator
 from datetime import timezone
+from typing import Any
 
 import pytest
 from inline_snapshot import snapshot
@@ -247,6 +248,14 @@ def test_all_failed() -> None:
     assert exceptions[0].body == {'error': 'test error'}
 
 
+def add_missing_response_model(spans: list[dict[str, Any]]) -> list[dict[str, Any]]:
+    for span in spans:
+        attrs = span.setdefault('attributes', {})
+        if 'gen_ai.request.model' in attrs:
+            attrs.setdefault('gen_ai.response.model', attrs['gen_ai.request.model'])
+    return spans
+
+
 @pytest.mark.skipif(not logfire_imports_successful(), reason='logfire not installed')
 def test_all_failed_instrumented(capfire: CaptureLogfire) -> None:
     fallback_model = FallbackModel(failure_model, failure_model)
@@ -260,7 +269,7 @@ def test_all_failed_instrumented(capfire: CaptureLogfire) -> None:
     assert exceptions[0].status_code == 500
     assert exceptions[0].model_name == 'test-function-model'
     assert exceptions[0].body == {'error': 'test error'}
-    assert capfire.exporter.exported_spans_as_dict() == snapshot(
+    assert add_missing_response_model(capfire.exporter.exported_spans_as_dict()) == snapshot(
         [
             {
                 'name': 'chat fallback:function:failure_response:,function:failure_response:',
@@ -277,6 +286,7 @@ def test_all_failed_instrumented(capfire: CaptureLogfire) -> None:
                     'logfire.span_type': 'span',
                     'logfire.msg': 'chat fallback:function:failure_response:,function:failure_response:',
                     'logfire.level_num': 17,
+                    'gen_ai.response.model': 'fallback:function:failure_response:,function:failure_response:',
                 },
                 'events': [
                     {
diff --git a/uv.lock b/uv.lock
index 9f62d14ff1..ebb0a6e1f0 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,5 +1,5 @@
 version = 1
-revision = 2
+revision = 3
 requires-python = ">=3.9"
 resolution-markers = [
     "python_full_version >= '3.13' and platform_python_implementation == 'PyPy'",
@@ -1696,7 +1696,7 @@ wheels = [
 
 [[package]]
 name = "logfire"
-version = "3.17.0"
+version = "4.0.0"
 source = { registry = "https://pypi.org/simple" }
 dependencies = [
     { name = "executing" },
@@ -1708,9 +1708,9 @@ dependencies = [
     { name = "tomli", marker = "python_full_version < '3.11'" },
     { name = "typing-extensions" },
 ]
-sdist = { url = "https://files.pythonhosted.org/packages/5e/3e/0367dc7cf0636c2baf4c5b58fa2b0d837302d71362c58f21472beddd271d/logfire-3.17.0.tar.gz", hash = "sha256:5c7230b373d9994b61466ec8a2462957826c4ca1d8351af7f43dde3e54f6f072", size = 486770, upload-time = "2025-06-03T15:26:49.148Z" }
+sdist = { url = "https://files.pythonhosted.org/packages/d8/85/4ee1ced49f2c378fd7df9f507d6426da3c3520957bfe56e6c049ccacd4e4/logfire-4.0.0.tar.gz", hash = "sha256:64d95fbf0f05c99a8b4c99a35b5b2971f11adbfbe9a73726df11d01c12f9959c", size = 512056, upload-time = "2025-07-22T15:12:05.951Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/87/81/e8d76d8b6c0d6d855df0e328af2ab68030b40f502002a5293f3b36c33b03/logfire-3.17.0-py3-none-any.whl", hash = "sha256:8ebccdb01e3af12ecf271246c2a6761ea35c109ef94f4d7520db6b7c3532cd05", size = 197653, upload-time = "2025-06-03T15:26:45.103Z" },
+    { url = "https://files.pythonhosted.org/packages/b3/06/377ff0eb5d78ba893025eafed6104088eccefb0e538a9bed24e1f5d4fe53/logfire-4.0.0-py3-none-any.whl", hash = "sha256:4e50887d61954f849ec05343ca71b29fec5c0b6e4e945cabbceed664e37966e7", size = 211515, upload-time = "2025-07-22T15:12:02.113Z" },
 ]
 
 [package.optional-dependencies]