diff --git a/.github/workflows/check-release.yml b/.github/workflows/check-release.yml
index d2c4744..53ae6fe 100644
--- a/.github/workflows/check-release.yml
+++ b/.github/workflows/check-release.yml
@@ -16,7 +16,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, macOS-latest, windows-latest]
         python: ['3.11', '3.12']
-        transformers: ['4.48.3', '4.52.4', '4.55.3', 'main']
+        transformers: ['4.48.3', '4.52.4', '4.55.4', 'main']
         torch: ['2.7', '2.8', 'main']
 
     steps:
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4a0f16c..adc81d8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         python: ['3.10', '3.11', '3.12', '3.13']
-        transformers: ['4.48.3', '4.51.3', '4.52.4', '4.53.3', '4.55.3', 'main']
+        transformers: ['4.48.3', '4.51.3', '4.52.4', '4.53.3', '4.55.4', 'main']
         torch: ['2.8', 'main']
         exclude:
           - python: '3.10'
@@ -28,7 +28,7 @@ jobs:
           - python: '3.10'
             transformers: '4.53.3'
           - python: '3.10'
-            transformers: '4.55.3'
+            transformers: '4.55.4'
           - python: '3.11'
             torch: 'main'
           - python: '3.11'
@@ -36,7 +36,7 @@ jobs:
           - python: '3.11'
             transformers: 'main'
           - python: '3.11'
-            transformers: '4.55.3'
+            transformers: '4.55.4'
           - python: '3.13'
             torch: '2.8'
           - python: '3.13'
diff --git a/_unittests/ut_torch_models/test_validate_whole_models.py b/_unittests/ut_torch_models/test_validate_whole_models.py
index 060ec81..096528a 100644
--- a/_unittests/ut_torch_models/test_validate_whole_models.py
+++ b/_unittests/ut_torch_models/test_validate_whole_models.py
@@ -116,28 +116,6 @@ def test_g_validate_model_onnx_dynamo_os_ort(self):
         onnx_filename = data["onnx_filename"]
         self.assertExists(onnx_filename)
 
-    @requires_torch("2.7")
-    @hide_stdout()
-    @ignore_warnings(FutureWarning)
-    @requires_experimental()
-    def test_h_validate_model_custom_os_ort(self):
-        mid = "arnir0/Tiny-LLM"
-        summary, data = validate_model(
-            mid,
-            do_run=True,
-            verbose=10,
-            exporter="custom",
-            dump_folder="dump_test/validate_model_custom_os_ort",
-            patch=True,
-            stop_if_static=2 if pv.Version(torch.__version__) > pv.Version("2.6.1") else 0,
-            optimization="default+os_ort",
-        )
-        self.assertIsInstance(summary, dict)
-        self.assertIsInstance(data, dict)
-        self.assertLess(summary["disc_onnx_ort_run_abs"], 1e-4)
-        onnx_filename = data["onnx_filename"]
-        self.assertExists(onnx_filename)
-
     @requires_torch("2.7")
     @hide_stdout()
     @ignore_warnings(FutureWarning)