diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f26f28a..05a2e2a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -71,6 +71,10 @@ jobs:
         with:
           distribution: 'temurin'
           java-version: ${{ matrix.java-version }}
+      - name: Set up Python
+        uses: actions/setup-python@v6  # https://github.com/actions/setup-python
+        with:
+          python-version: '3.12'
       - name: Perform build
         env:
           SCALA_VERSION: ${{ matrix.scala-version }}
@@ -112,7 +116,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v6  # https://github.com/actions/setup-python
         with:
-          python-version: '3.9'
+          python-version: '3.12'
       - name: Publish to PyPI
         run: ./gradlew publishPythonPackage
         env:
diff --git a/isolation-forest-onnx/pyproject.toml b/isolation-forest-onnx/pyproject.toml
index f61e8ce..a67ed70 100644
--- a/isolation-forest-onnx/pyproject.toml
+++ b/isolation-forest-onnx/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 88
-target-version = ['py39']
+target-version = ['py311']
 exclude = '''
 /(
     venv
diff --git a/isolation-forest-onnx/requirements.txt b/isolation-forest-onnx/requirements.txt
index adba846..a37555d 100644
--- a/isolation-forest-onnx/requirements.txt
+++ b/isolation-forest-onnx/requirements.txt
@@ -1,5 +1,5 @@
 avro-python3==1.9.1
-numpy==1.26.4
-onnx==1.17.0
-onnxruntime==1.19.2
+numpy==2.2.6
+onnx==1.21.0
+onnxruntime==1.24.1
 protobuf==5.29.6
diff --git a/isolation-forest-onnx/setup.cfg b/isolation-forest-onnx/setup.cfg
index da69396..b0814eb 100644
--- a/isolation-forest-onnx/setup.cfg
+++ b/isolation-forest-onnx/setup.cfg
@@ -13,12 +13,12 @@ keywords = isolation forest, ONNX
 packages = isolationforestonnx
 package_dir =
     = src
-python_requires = >=3.9
+python_requires = >=3.11
 install_requires =
     avro_python3==1.9.1
-    numpy==1.26.4
-    onnx==1.17.0
-    onnxruntime==1.18.0
+    numpy==2.2.6
+    onnx==1.21.0
+    onnxruntime==1.24.1
     protobuf==5.29.6
 
 [options.extras_require]
diff --git a/isolation-forest-onnx/src/isolationforestonnx/isolation_forest_converter.py b/isolation-forest-onnx/src/isolationforestonnx/isolation_forest_converter.py
index b196c7d..d14c355 100644
--- a/isolation-forest-onnx/src/isolationforestonnx/isolation_forest_converter.py
+++ b/isolation-forest-onnx/src/isolationforestonnx/isolation_forest_converter.py
@@ -161,6 +161,9 @@ def convert(self) -> ModelProto:
                 helper.make_opsetid("", 14),
             ],
         )
+        # Pin IR version for maximum portability across ONNX runtimes.
+        # The model only uses opset 14, which is fully supported by IR 10.
+        model.ir_version = 10
 
         try:
             checker.check_model(model)
diff --git a/isolation-forest-onnx/test/test_isolation_forest_converter.py b/isolation-forest-onnx/test/test_isolation_forest_converter.py
index 93bbc22..fc9ed40 100644
--- a/isolation-forest-onnx/test/test_isolation_forest_converter.py
+++ b/isolation-forest-onnx/test/test_isolation_forest_converter.py
@@ -69,7 +69,7 @@ def _roc_auc_score(y_true, y_score):
     fpr = np.concatenate(([0], fpr))
 
     # Compute the AUC using trapezoidal integration
-    auc = np.trapz(tpr, fpr)
+    auc = np.trapezoid(tpr, fpr)
 
     return auc