diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index b799f20..564f3c8 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -18,6 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        # NOTE if newer versions are added, update sony_custom_layers.__init__ pinned_requirements!!!
         py_ver: ["3.8", "3.9", "3.10", "3.11"]
         tf_ver: ["2.10", "2.11", "2.12", "2.13", "2.14", "2.15"]
         exclude:
@@ -38,7 +39,7 @@ jobs:
           python-version: ${{matrix.py_ver}}
       - name: Install dependencies
         run: |
-          pip install tensorflow==${{matrix.tf_ver}}
+          pip install tensorflow==${{matrix.tf_ver}}.*
           pip install -r requirements_test.txt
           pip list
       - name: Run pytest
@@ -50,15 +51,25 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        # NOTE if newer versions are added, update sony_custom_layers.__init__ pinned_requirements!!!
         py_ver: [ "3.8", "3.9", "3.10", "3.11" ]
-        torch_ver: ["2.2.*"]
-        torchvision_ver: ["0.17.*"]  # <0.17 incompatible with torch2.2
-        ort_ver: ["1.15.*", "1.16.*", "1.17.*"]        
-        ort_ext_ver: ["0.8.*", "0.9.*", "0.10.*"]
-        onnx_ver: ["1.14.*", "1.15.*"]
+        torch_ver: ["2.0", "2.1", "2.2"]
+        ort_ver: ["1.15", "1.16", "1.17"]
+        ort_ext_ver: ["0.8", "0.9", "0.10"]
+        include:
+          - torch_ver: "2.2"
+            torchvision_ver: "0.17"
+            onnx_ver: "1.15"
+          - torch_ver: "2.1"
+            torchvision_ver: "0.16"
+            onnx_ver: "1.14"
+          - torch_ver: "2.0"
+            torchvision_ver: "0.15"
+            onnx_ver: "1.15"
+
         exclude:
           - py_ver: "3.11"
-            ort_ext_ver: "0.8.*"
+            ort_ext_ver: "0.8"
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -68,11 +79,11 @@ jobs:
           python-version: ${{matrix.py_ver}}
       - name: Install dependencies
         run: |
-          pip install torch==${{matrix.torch_ver}} \
-                      torchvision==${{matrix.torchvision_ver}} \
-                      onnxruntime==${{matrix.ort_ver}} \
-                      onnxruntime_extensions==${{matrix.ort_ext_ver}} \
-                      onnx==${{matrix.onnx_ver}} \
+          pip install torch==${{matrix.torch_ver}}.* \
+                      torchvision==${{matrix.torchvision_ver}}.* \
+                      onnxruntime==${{matrix.ort_ver}}.* \
+                      onnxruntime_extensions==${{matrix.ort_ext_ver}}.* \
+                      onnx==${{matrix.onnx_ver}}.* \
                       --index-url https://download.pytorch.org/whl/cpu \
                       --extra-index-url https://pypi.org/simple
 
@@ -91,12 +102,10 @@ jobs:
         uses: actions/setup-python@v5
         with:
           python-version: "3.10"
-
       - name: Run pre-commit
         run: |
           ./install-pre-commit.sh
           pre-commit run --all
-
       - name: get new dev tag
         shell: bash
         run : |
@@ -128,7 +137,7 @@ jobs:
           echo "__version__ = '${{ env.new_ver }}'" >  sony_custom_layers/version.py
           echo "print sony_custom_layers/version.py"
           cat sony_custom_layers/version.py
-          
+        
           sed -i 's/name = sony-custom-layers/name = sony-custom-layers-dev/' setup.cfg
           echo "print setup.cfg"
           cat setup.cfg
@@ -148,5 +157,3 @@ jobs:
             git tag ${{ env.new_tag }}
             git push origin ${{ env.new_tag }}
           fi
-         
-    
diff --git a/README.md b/README.md
index 8455246..ca8b9d0 100644
--- a/README.md
+++ b/README.md
@@ -20,11 +20,11 @@ To install the latest stable release of SCL, run the following command:
 pip install sony-custom-layers
 ```
 By default, no framework dependencies are installed.
-To install SCL including the dependencies for TensorFlow:
+To install SCL including the latest tested dependencies (up to patch version) for TensorFlow:
 ```
 pip install sony-custom-layers[tf]
 ```
-To install SCL including the dependencies for PyTorch/ONNX/OnnxRuntime:
+To install SCL including the latest tested dependencies (up to patch version) for PyTorch/ONNX/OnnxRuntime:
 ```
 pip install sony-custom-layers[torch]
 ```
@@ -43,9 +43,9 @@ pip install sony-custom-layers[torch]
 
 #### PyTorch
 
-| **Tested FW versions**          | **Tested Python version** | **Serialization**                                                |
-|---------------------------------|---------------------------|------------------------------------------------------------------|
-| torch 2.2<br/>torchvision 0.17<br/>onnxruntime 1.15-1.17<br/>onnxruntime_extensions 0.8-0.10<br/>onnx 1.14-1.15| 3.8-3.11                  | .onnx (via torch.onnx.export)<br/>.pt2 (via torch.export.export) |
+| **Tested FW versions**                                                                                                   | **Tested Python version** | **Serialization**                                                               |
+|--------------------------------------------------------------------------------------------------------------------------|---------------------------|---------------------------------------------------------------------------------|
+| torch 2.0-2.2<br/>torchvision 0.15-0.17<br/>onnxruntime 1.15-1.17<br/>onnxruntime_extensions 0.8-0.10<br/>onnx 1.14-1.15 | 3.8-3.11                  | .onnx (via torch.onnx.export)<br/>.pt2 (via torch.export.export, torch2.2 only) |
 
 ## Implemented Layers
 SCL currently includes implementations of the following layers:
diff --git a/setup.py b/setup.py
index 517d6d9..86b5301 100644
--- a/setup.py
+++ b/setup.py
@@ -23,11 +23,11 @@
 """
 from setuptools import setup
 
-from sony_custom_layers import requirements
+from sony_custom_layers import pinned_requirements
 
 extras_require = {
-    'torch': requirements['torch'] + requirements['torch_ort'],
-    'tf': requirements['tf'],
+    'torch': pinned_requirements['torch'] + pinned_requirements['torch_ort'],
+    'tf': pinned_requirements['tf'],
 }
 
 setup(extras_require=extras_require)
diff --git a/sony_custom_layers/__init__.py b/sony_custom_layers/__init__.py
index abd89cb..e0faecf 100644
--- a/sony_custom_layers/__init__.py
+++ b/sony_custom_layers/__init__.py
@@ -14,9 +14,16 @@
 # limitations under the License.
 # -----------------------------------------------------------------------------
 
-# for use by setup.py and for dynamic validation in sony_custom_layers.{keras, pytorch}.__init__
+# minimal requirements for dynamic validation in sony_custom_layers.{keras, pytorch}.__init__
 requirements = {
-    'tf': ['tensorflow>=2.10,<2.16'],
-    'torch': ['torch>=2.2.0', 'torchvision>=0.17.0'],
-    'torch_ort': ['onnxruntime', 'onnxruntime_extensions>=0.8.0'],
+    'tf': ['tensorflow>=2.10'],
+    'torch': ['torch>=2.0', 'torchvision>=0.15'],
+    'torch_ort': ['onnx', 'onnxruntime', 'onnxruntime_extensions>=0.8.0'],
+}
+
+# pinned requirements of latest tested versions for extra_requires
+pinned_requirements = {
+    'tf': ['tensorflow==2.15.*'],
+    'torch': ['torch==2.2.*', 'torchvision==0.17.*'],
+    'torch_ort': ['onnx==1.15.*', 'onnxruntime==1.17.*', 'onnxruntime_extensions==0.10.*']
 }
diff --git a/sony_custom_layers/keras/__init__.py b/sony_custom_layers/keras/__init__.py
index 4d7d25e..6ad534e 100644
--- a/sony_custom_layers/keras/__init__.py
+++ b/sony_custom_layers/keras/__init__.py
@@ -14,10 +14,10 @@
 # limitations under the License.
 # -----------------------------------------------------------------------------
 
-from sony_custom_layers.util.import_util import check_pip_requirements
+from sony_custom_layers.util.import_util import validate_pip_requirements
 from sony_custom_layers import requirements
 
-check_pip_requirements(requirements['tf'])
+validate_pip_requirements(requirements['tf'])
 
 from .object_detection import FasterRCNNBoxDecode, SSDPostProcess, ScoreConverter    # noqa: E402
 from .custom_objects import custom_layers_scope    # noqa: E402
diff --git a/sony_custom_layers/pytorch/__init__.py b/sony_custom_layers/pytorch/__init__.py
index e29a600..5e6e8db 100644
--- a/sony_custom_layers/pytorch/__init__.py
+++ b/sony_custom_layers/pytorch/__init__.py
@@ -15,7 +15,7 @@
 # -----------------------------------------------------------------------------
 from typing import Optional, TYPE_CHECKING
 
-from sony_custom_layers.util.import_util import check_pip_requirements
+from sony_custom_layers.util.import_util import validate_pip_requirements
 from sony_custom_layers import requirements
 
 if TYPE_CHECKING:
@@ -23,7 +23,7 @@
 
 __all__ = ['multiclass_nms', 'NMSResults', 'load_custom_ops']
 
-check_pip_requirements(requirements['torch'])
+validate_pip_requirements(requirements['torch'])
 
 from .object_detection import multiclass_nms, NMSResults    # noqa: E402
 
@@ -53,7 +53,7 @@ def load_custom_ops(load_ort: bool = False,
         SessionOptions object if ort registration was requested, otherwise None
     """
     if load_ort or ort_session_ops:
-        check_pip_requirements(requirements['torch_ort'])
+        validate_pip_requirements(requirements['torch_ort'])
 
         # trigger onnxruntime op registration
         from .object_detection import nms_ort
diff --git a/sony_custom_layers/pytorch/object_detection/nms.py b/sony_custom_layers/pytorch/object_detection/nms.py
index 5dd0981..46073aa 100644
--- a/sony_custom_layers/pytorch/object_detection/nms.py
+++ b/sony_custom_layers/pytorch/object_detection/nms.py
@@ -20,7 +20,11 @@
 from torch import Tensor
 import torchvision    # noqa: F401 # needed for torch.ops.torchvision
 
-MULTICLASS_NMS_TORCH_OP = 'sony::multiclass_nms'
+from sony_custom_layers.util.import_util import is_compatible
+
+CUSTOM_LIB_NAME = 'sony'
+MULTICLASS_NMS_TORCH_OP = 'multiclass_nms'
+MULTICLASS_NMS_TORCH_OP_QUALNAME = CUSTOM_LIB_NAME + '::' + MULTICLASS_NMS_TORCH_OP
 
 __all__ = ['multiclass_nms', 'NMSResults']
 
@@ -57,13 +61,19 @@ def multiclass_nms(boxes, scores, score_threshold: float, iou_threshold: float,
     return NMSResults(*torch.ops.sony.multiclass_nms(boxes, scores, score_threshold, iou_threshold, max_detections))
 
 
-torch.library.define(
-    MULTICLASS_NMS_TORCH_OP,
-    "(Tensor boxes, Tensor scores, float score_threshold, float iou_threshold, SymInt max_detections) -> "
-    "(Tensor, Tensor, Tensor, Tensor)")
+custom_lib = torch.library.Library(CUSTOM_LIB_NAME, "DEF")
+schema = (MULTICLASS_NMS_TORCH_OP +
+          "(Tensor boxes, Tensor scores, float score_threshold, float iou_threshold, SymInt max_detections) "
+          "-> (Tensor, Tensor, Tensor, Tensor)")
+op_name = custom_lib.define(schema)
+
+if is_compatible('torch>=2.2'):
+    register_impl = torch.library.impl(MULTICLASS_NMS_TORCH_OP_QUALNAME, 'default')
+else:
+    register_impl = torch.library.impl(custom_lib, MULTICLASS_NMS_TORCH_OP)
 
 
-@torch.library.impl(MULTICLASS_NMS_TORCH_OP, 'default')
+@register_impl
 def _multiclass_nms_op(boxes: torch.Tensor, scores: torch.Tensor, score_threshold: float, iou_threshold: float,
                        max_detections: int) -> NMSResults:
     """ Registers the torch op as torch.ops.sony.multiclass_nms """
@@ -74,19 +84,21 @@ def _multiclass_nms_op(boxes: torch.Tensor, scores: torch.Tensor, score_threshol
                                 max_detections=max_detections)
 
 
-@torch.library.impl_abstract(MULTICLASS_NMS_TORCH_OP)
-def _multiclass_nms_meta(boxes: torch.Tensor, scores: torch.Tensor, score_threshold: float, iou_threshold: float,
-                         max_detections: int) -> NMSResults:
-    """ Registers torch op's abstract implementation. It specifies the properties of the output tensors.
-        Needed for torch.export """
-    ctx = torch.library.get_ctx()
-    batch = ctx.new_dynamic_size()
-    return NMSResults(
-        torch.empty((batch, max_detections, 4)),
-        torch.empty((batch, max_detections)),
-        torch.empty((batch, max_detections), dtype=torch.int64),
-        torch.empty((batch, 1), dtype=torch.int64)
-    )    # yapf: disable
+if is_compatible('torch>=2.2'):
+
+    @torch.library.impl_abstract(MULTICLASS_NMS_TORCH_OP_QUALNAME)
+    def _multiclass_nms_meta(boxes: torch.Tensor, scores: torch.Tensor, score_threshold: float, iou_threshold: float,
+                             max_detections: int) -> NMSResults:
+        """ Registers torch op's abstract implementation. It specifies the properties of the output tensors.
+            Needed for torch.export """
+        ctx = torch.library.get_ctx()
+        batch = ctx.new_dynamic_size()
+        return NMSResults(
+            torch.empty((batch, max_detections, 4)),
+            torch.empty((batch, max_detections)),
+            torch.empty((batch, max_detections), dtype=torch.int64),
+            torch.empty((batch, 1), dtype=torch.int64)
+        )    # yapf: disable
 
 
 def _multiclass_nms_impl(boxes: Union[Tensor, np.ndarray], scores: Union[Tensor, np.ndarray], score_threshold: float,
diff --git a/sony_custom_layers/pytorch/object_detection/nms_onnx.py b/sony_custom_layers/pytorch/object_detection/nms_onnx.py
index d514a77..83e70a8 100644
--- a/sony_custom_layers/pytorch/object_detection/nms_onnx.py
+++ b/sony_custom_layers/pytorch/object_detection/nms_onnx.py
@@ -15,7 +15,7 @@
 # -----------------------------------------------------------------------------
 import torch
 
-from .nms import MULTICLASS_NMS_TORCH_OP
+from .nms import MULTICLASS_NMS_TORCH_OP_QUALNAME
 
 MULTICLASS_NMS_ONNX_OP = "Sony::MultiClassNMS"
 
@@ -42,4 +42,4 @@ def multiclass_nms_onnx(g, boxes, scores, score_threshold, iou_threshold, max_de
     return outputs
 
 
-torch.onnx.register_custom_op_symbolic(MULTICLASS_NMS_TORCH_OP, multiclass_nms_onnx, opset_version=1)
+torch.onnx.register_custom_op_symbolic(MULTICLASS_NMS_TORCH_OP_QUALNAME, multiclass_nms_onnx, opset_version=1)
diff --git a/sony_custom_layers/pytorch/tests/object_detection/test_multiclass_nms.py b/sony_custom_layers/pytorch/tests/object_detection/test_multiclass_nms.py
index 5df1f76..d88e4d2 100644
--- a/sony_custom_layers/pytorch/tests/object_detection/test_multiclass_nms.py
+++ b/sony_custom_layers/pytorch/tests/object_detection/test_multiclass_nms.py
@@ -25,6 +25,7 @@
 
 from sony_custom_layers.pytorch.object_detection import nms
 from sony_custom_layers.pytorch import load_custom_ops
+from sony_custom_layers.util.import_util import is_compatible
 from sony_custom_layers.util.test_util import exec_in_clean_process
 
 
@@ -261,6 +262,7 @@ def test_ort(self, dynamic_batch, tmpdir_factory):
         """
         exec_in_clean_process(code, check=True)
 
+    @pytest.mark.skipif(not is_compatible('torch>=2.2'), reason='unsupported')
     def test_pt2_export(self, tmpdir_factory):
 
         def f(boxes, scores):
diff --git a/sony_custom_layers/util/import_util.py b/sony_custom_layers/util/import_util.py
index b6bf03b..3ad9d5e 100644
--- a/sony_custom_layers/util/import_util.py
+++ b/sony_custom_layers/util/import_util.py
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # -----------------------------------------------------------------------------
-from typing import List
+from typing import List, Union
 
 from packaging.requirements import Requirement
 from packaging.version import parse
@@ -24,9 +24,9 @@ class RequirementError(Exception):
     pass
 
 
-def check_pip_requirements(requirements: List[str]):
+def validate_pip_requirements(requirements: List[str]):
     """
-    Check if all requirements are installed and meet the version specifications.
+    Validate that all requirements are installed and meet the version specifications.
 
     Args:
         requirements: a list of pip-style requirement strings
@@ -47,3 +47,20 @@ def check_pip_requirements(requirements: List[str]):
             error += f'\nRequired {req_str}, installed version {installed_ver}'
     if error:
         raise RequirementError(error)
+
+
+def is_compatible(requirements: Union[str, List]) -> bool:
+    """
+    Non-raising requirement(s) check
+    Args:
+        requirements (str, List): requirement pip-style string or a list of requirement strings
+
+    Returns:
+        (bool) whether requirement(s) are satisfied
+    """
+    requirements = [requirements] if isinstance(requirements, str) else requirements
+    try:
+        validate_pip_requirements(requirements)
+    except RequirementError:
+        return False
+    return True