diff --git a/siplib/siplib.c b/siplib/siplib.c
index f2ac7be..27b9e35 100644
--- a/siplib/siplib.c
+++ b/siplib/siplib.c
@@ -1691,7 +1691,7 @@ static PyObject *sip_api_call_method(int *isErr, PyObject *method,
     va_start(va,fmt);
 
     if ((args = PyTuple_New(strlen(fmt))) != NULL && buildObject(args,fmt,va) != NULL)
-        res = PyEval_CallObject(method,args);
+        res = PyObject_CallObject(method,args);
     else
     {
         res = NULL;
@@ -9635,18 +9635,37 @@ static PyObject *parseString_AsEncodedString(PyObject *bytes, PyObject *obj,
 static int parseBytes_AsCharArray(PyObject *obj, const char **ap,
         SIP_SSIZE_T *aszp)
 {
+    const char *a;
+    SIP_SSIZE_T asz;
+
     if (obj == Py_None)
     {
-        *ap = NULL;
-        *aszp = 0;
+        a = NULL;
+        asz = 0;
     }
     else if (PyBytes_Check(obj))
     {
-        *ap = PyBytes_AS_STRING(obj);
-        *aszp = PyBytes_GET_SIZE(obj);
+        a = PyBytes_AS_STRING(obj);
+        asz = PyBytes_GET_SIZE(obj);
     }
-    else if (PyObject_AsCharBuffer(obj, ap, aszp) < 0)
-        return -1;
+    else
+    {
+        Py_buffer view;
+
+        if (PyObject_GetBuffer(obj, &view, PyBUF_SIMPLE) < 0)
+            return -1;
+
+        a = view.buf;
+        asz = view.len;
+
+        PyBuffer_Release(&view);
+    }
+
+    if (ap)
+        *ap = a;
+
+    if (aszp)
+        *aszp = asz;
 
     return 0;
 }
@@ -9665,13 +9684,24 @@ static int parseBytes_AsChar(PyObject *obj, char *ap)
         chp = PyBytes_AS_STRING(obj);
         sz = PyBytes_GET_SIZE(obj);
     }
-    else if (PyObject_AsCharBuffer(obj, &chp, &sz) < 0)
-        return -1;
+    else
+    {
+        Py_buffer view;
+
+        if (PyObject_GetBuffer(obj, &view, PyBUF_SIMPLE) < 0)
+            return -1;
+
+        chp = view.buf;
+        sz = view.len;
+
+        PyBuffer_Release(&view);
+    }
 
     if (sz != 1)
         return -1;
 
-    *ap = *chp;
+    if (ap)
+        *ap = *chp;
 
     return 0;
 }
diff --git a/siplib/tqtlib.c b/siplib/tqtlib.c
index d59c138..1fa8cfa 100644
--- a/siplib/tqtlib.c
+++ b/siplib/tqtlib.c
@@ -196,7 +196,7 @@ PyObject *sip_api_invoke_slot(const sipSlot *slot, PyObject *sigargs)
     {
         PyObject *nsa, *xtype, *xvalue, *xtb, *resobj;
 
-        if ((resobj = PyEval_CallObject(sfunc, sa)) != NULL)
+        if ((resobj = PyObject_CallObject(sfunc, sa)) != NULL)
         {
             Py_DECREF(sfunc);
             Py_XDECREF(sref);