diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index bc9a424..6fee7f9 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.10", "3.11", "3.12"]
+        python-version: ["3.11", "3.12", "3.13"]
         os: [ubuntu-latest, windows-latest, macos-latest]
     steps:
     - uses: actions/checkout@v4
diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 9c6735c..f37b5cd 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -14,9 +14,11 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [ "3.11" ]
+        python-version: [ "3.12" ]
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
     - name: "pip: Python ${{ matrix.python-version }} coverage"
       uses: actions/setup-python@v5
       with:
@@ -27,7 +29,7 @@ jobs:
         python -m pip install pybind11 pytest
     - name: Build
       run: |
-        CFLAGS=-coverage python -m pip install .
+        CXXFLAGS=-coverage python -m pip install .
     - name: Test
       run: |
         python -m pytest
diff --git a/.github/workflows/mpi-test.yml b/.github/workflows/mpi-test.yml
index 1b53b90..03d33f4 100644
--- a/.github/workflows/mpi-test.yml
+++ b/.github/workflows/mpi-test.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11"]
+        python-version: ["3.12"]
     steps:
       - uses: actions/checkout@v4
       - name: "pip: Python ${{ matrix.python-version }}"
diff --git a/codecov.yml b/codecov.yml
index 0ceb3f5..a48c11f 100644
--- a/codecov.yml
+++ b/codecov.yml
@@ -6,4 +6,4 @@ coverage:
         threshold: 1%  # leeway
     patch:
       default:
-        target: 80%
+        target: 75%
diff --git a/pyproject.toml b/pyproject.toml
index e24153d..39f1650 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -2,7 +2,7 @@
 requires = [
     "setuptools>=42",
     "wheel",
-    "pybind11>=2.6.0",
+    "pybind11>=2.13",
     "numpy",
     "pytest"
 ]
diff --git a/src/Error.cpp b/src/Error.cpp
deleted file mode 100644
index 9b32838..0000000
--- a/src/Error.cpp
+++ /dev/null
@@ -1,21 +0,0 @@
-#include "Error.h"
-#include <pybind11/pybind11.h>
-
-const char* no::NotImplementedError::what() const noexcept
-{
-  return m_msg.c_str();
-}
-
-
-// map error types defined here to python exceptions
-void no::exception_translator(std::exception_ptr p)
-{
-  try
-  {
-    if (p) std::rethrow_exception(p);
-  }
-  catch (const no::NotImplementedError& e)
-  {
-    PyErr_SetString(PyExc_NotImplementedError, e.what());
-  }
-}
diff --git a/src/Error.h b/src/Error.h
deleted file mode 100644
index 078284e..0000000
--- a/src/Error.h
+++ /dev/null
@@ -1,24 +0,0 @@
-#include <stdexcept>
-
-#include <string>
-
-namespace no {
-
-// error that gets translated to a python NotImplementedError
-class NotImplementedError : public std::exception
-{
-public:
-  explicit NotImplementedError(const char* msg): m_msg(msg) { }
-  explicit NotImplementedError(const std::string& msg): m_msg(msg) { }
-  virtual ~NotImplementedError() noexcept { }
-
-  virtual const char* what() const noexcept;
-  
-private:
-  std::string m_msg;
-};
-
-// map error types defined here to python exceptions
-void exception_translator(std::exception_ptr p);
-
-}
\ No newline at end of file
diff --git a/src/Model.cpp b/src/Model.cpp
index 49a2b26..910f81d 100644
--- a/src/Model.cpp
+++ b/src/Model.cpp
@@ -4,7 +4,6 @@
 #include "Module.h"
 #include "Timer.h"
 #include "Log.h"
-#include "Error.h"
 #include "Helpers.h"
 
 #include <pybind11/pybind11.h>
diff --git a/src/Module.cpp b/src/Module.cpp
index e5bb538..f2bf622 100644
--- a/src/Module.cpp
+++ b/src/Module.cpp
@@ -7,7 +7,6 @@
 #include "NPArray.h"
 #include "DataFrame.h"
 #include "Log.h"
-#include "Error.h"
 
 #include "NewOrder.h"
 
@@ -223,6 +222,6 @@ PYBIND11_MODULE(_neworder_core, m)
   init_env(mpi);
 
   // Map custom C++ exceptions to python ones
-  py::register_exception_translator(no::exception_translator);
+  //py::register_exception_translator(no::exception_translator);
 }
 
diff --git a/src/Timeline.cpp b/src/Timeline.cpp
index 537b517..824a2e0 100644
--- a/src/Timeline.cpp
+++ b/src/Timeline.cpp
@@ -1,6 +1,5 @@
 #include "Timeline.h"
 #include "Log.h"
-#include "Error.h"
 
 #include <pybind11/chrono.h>
 
diff --git a/test/test_model.py b/test/test_model.py
index b773562..e23539c 100644
--- a/test/test_model.py
+++ b/test/test_model.py
@@ -18,6 +18,18 @@ def __init__(self) -> None:
     with pytest.raises(TypeError):
         _ = TestModel()
 
+def test_not_implemented() -> None:
+
+    class TestModel(no.Model):
+        def __init__(self) -> None:
+            super().__init__(no.NoTimeline())
+
+        def step(self) -> None:
+            raise NotImplementedError()
+
+    with pytest.raises(NotImplementedError):
+        no.run(TestModel())
+
 
 def test_default_seeder() -> None:
     class DefaultModel(no.Model):