diff --git a/pynih/contract/source/contract/pyclass.d b/pynih/contract/source/contract/pyclass.d
index 6303f874..c4146e13 100644
--- a/pynih/contract/source/contract/pyclass.d
+++ b/pynih/contract/source/contract/pyclass.d
@@ -79,7 +79,7 @@ package PyObject* pyclass_string_list_struct(PyObject* self, PyObject *args) {
             return null;
         }
 
-        const length = PyUnicode_GetSize(item);
+        const length = PyUnicode_GetLength(item);
         auto ptr = PyBytes_AsString(unicode);
         auto str = ptr is null ? null : ptr[0 .. length];
 
diff --git a/pynih/contract/source/contract/udt.d b/pynih/contract/source/contract/udt.d
index a3d1f625..e6bd72e5 100644
--- a/pynih/contract/source/contract/udt.d
+++ b/pynih/contract/source/contract/udt.d
@@ -22,10 +22,10 @@ package PyObject* simple_struct_func(PyObject* self, PyObject *args) nothrow @no
     // either this of PyGetSetDef
     static PyMemberDef[3] members;
     members[0].name = cast(typeof(PyMemberDef.name)) &"the_int"[0];
-    members[0].type = T_INT;
+    members[0].type = Py_T_INT;
     members[0].offset = MyType.i.offsetof;
     members[1].name = cast(typeof(PyMemberDef.name)) &"the_double"[0];
-    members[1].type = T_DOUBLE;
+    members[1].type = Py_T_DOUBLE;
     members[1].offset = MyType.d.offsetof;
 
     static PyTypeObject type;
diff --git a/pynih/source/autowrap/pynih/python/conv/python_to_d.d b/pynih/source/autowrap/pynih/python/conv/python_to_d.d
index c2bc48a6..dd43cb8f 100644
--- a/pynih/source/autowrap/pynih/python/conv/python_to_d.d
+++ b/pynih/source/autowrap/pynih/python/conv/python_to_d.d
@@ -233,11 +233,11 @@ T to(T)(PyObject* value) if(isArray!T && !isSomeString!T)
 
 T to(T)(PyObject* value) if(isSomeString!T) {
 
-    import python.c: PyUnicode_GetSize, PyUnicode_Check,
+    import python.c: PyUnicode_GetLength, PyUnicode_Check,
         PyBytes_AsString, PyUnicode_AsUTF8String, Py_ssize_t;
     import std.conv: to;
 
-    const length = PyUnicode_GetSize(value);
+    const length = PyUnicode_GetLength(value);
     if(length == 0) return T.init;
 
     auto str = PyUnicode_AsUTF8String(value);
diff --git a/pynih/source/autowrap/pynih/python/cooked.d b/pynih/source/autowrap/pynih/python/cooked.d
index 21a876e1..83ee86b4 100644
--- a/pynih/source/autowrap/pynih/python/cooked.d
+++ b/pynih/source/autowrap/pynih/python/cooked.d
@@ -20,7 +20,7 @@ auto createModule(Module module_, alias cfunctions, alias aggregates = Aggregate
     static PyModuleDef moduleDef;
 
     auto pyMethodDefs = cFunctionsToPyMethodDefs!(cfunctions);
-    moduleDef = pyModuleDef(module_.name.ptr, null /*doc*/, -1 /*size*/, pyMethodDefs);
+    moduleDef = PyModuleDef(pyModuleDefHeadInit, module_.name.ptr, null /*doc*/, -1 /*size*/, pyMethodDefs);
 
     auto module_ = PyModule_Create(&moduleDef);
     addModuleTypes!(aggregates.Types)(module_);
@@ -73,20 +73,6 @@ private PyMethodDef* cFunctionsToPyMethodDefs(alias cfunctions)()
 }
 
 
-/**
-   Helper function to get around the C syntax problem with
-   PyModuleDef_HEAD_INIT - it doesn't compile in D.
-*/
-private auto pyModuleDef(A...)(auto ref A args) {
-    import std.functional: forward;
-
-    return PyModuleDef(
-        // the line below is a manual D version expansion of PyModuleDef_HEAD_INIT
-        PyModuleDef_Base(PyObject(1 /*ref count*/, null /*type*/), null /*m_init*/, 0/*m_index*/, null/*m_copy*/),
-        forward!args
-    );
-}
-
 /**
    Helper function to create PyMethodDef structs.
    The strings are compile-time parameters to avoid passing GC-allocated memory
diff --git a/requirements.txt b/requirements.txt
index f5e037ac..7b352005 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,22 +1,5 @@
-attrs==21.2.0
-blessings==1.7
-bpython==0.21
-certifi==2023.7.22
-chardet==4.0.0
-curtsies==0.3.5
-cwcwidth==0.1.4
-greenlet==1.1.0
-idna==3.7
-iniconfig==1.1.1
-numpy==1.22.0
-packaging==20.9
-pluggy==0.13.1
-py==1.10.0
-Pygments==2.15.0
-pyparsing==2.4.7
-pytest==6.2.4
-pyxdg==0.27
-requests==2.32.0
-six==1.16.0
-toml==0.10.2
-urllib3==1.26.18
+iniconfig==2.0.0
+numpy==1.26.4
+packaging==24.0
+pluggy==1.5.0
+pytest==8.2.1