diff --git a/Lib/cu2qu/cython.py b/Lib/cu2qu/cython.py
index 4e6f30c..4cc5676 100644
--- a/Lib/cu2qu/cython.py
+++ b/Lib/cu2qu/cython.py
@@ -6,15 +6,13 @@
 # cython.* namespace for pure mode.
 from __future__ import absolute_import
 
-__version__ = "0.28.5"
+__version__ = "0.29.14"
 
 try:
     from __builtin__ import basestring
 except ImportError:
     basestring = str
 
-from .errors import InvalidTypeSpecification
-
 
 # BEGIN shameless copy from Cython/minivect/minitypes.py
 
@@ -48,6 +46,8 @@ def index_type(base_type, item):
     a 2D strided array of doubles. The syntax is the same as for
     Cython memoryviews.
     """
+    class InvalidTypeSpecification(Exception):
+        pass
 
     def verify_slice(s):
         if s.start or s.stop or s.step not in (None, 1):
@@ -113,13 +113,14 @@ class _Optimization(object):
 cclass = ccall = cfunc = _EmptyDecoratorAndManager()
 
 returns = wraparound = boundscheck = initializedcheck = nonecheck = \
-    overflowcheck = embedsignature = cdivision = cdivision_warnings = \
+    embedsignature = cdivision = cdivision_warnings = \
     always_allows_keywords = profile = linetrace = infer_types = \
     unraisable_tracebacks = freelist = \
         lambda _: _EmptyDecoratorAndManager()
 
 exceptval = lambda _=None, check=True: _EmptyDecoratorAndManager()
 
+overflowcheck = lambda _: _EmptyDecoratorAndManager()
 optimization = _Optimization()
 
 overflowcheck.fold = optimization.use_switch = \
@@ -190,8 +191,15 @@ def declare(type=None, value=_Unspecified, **kwds):
         return value
 
 class _nogil(object):
-    """Support for 'with nogil' statement
+    """Support for 'with nogil' statement and @nogil decorator.
     """
+    def __call__(self, x):
+        if callable(x):
+            # Used as function decorator => return the function unchanged.
+            return x
+        # Used as conditional context manager or to create an "@nogil(True/False)" decorator => keep going.
+        return self
+
     def __enter__(self):
         pass
     def __exit__(self, exc_class, exc, tb):
@@ -201,6 +209,7 @@ def __exit__(self, exc_class, exc, tb):
 gil = _nogil()
 del _nogil
 
+
 # Emulated types
 
 class CythonMetaType(type):
@@ -451,7 +460,7 @@ class CythonDotParallel(object):
     def parallel(self, num_threads=None):
         return nogil
 
-    def prange(self, start=0, stop=None, step=1, schedule=None, nogil=False):
+    def prange(self, start=0, stop=None, step=1, nogil=False, schedule=None, chunksize=None, num_threads=None):
         if stop is None:
             stop = start
             start = 0
diff --git a/Lib/cu2qu/errors.py b/Lib/cu2qu/errors.py
index 8604f8f..ff47408 100644
--- a/Lib/cu2qu/errors.py
+++ b/Lib/cu2qu/errors.py
@@ -63,7 +63,3 @@ def __str__(self):
         return "fonts contains incompatible glyphs: %s" % (
             ", ".join(repr(g) for g in sorted(self.glyph_errors.keys()))
         )
-
-
-class InvalidTypeSpecification(Error):
-    pass