diff --git a/README.rst b/README.rst
index b34e59c9..72103532 100644
--- a/README.rst
+++ b/README.rst
@@ -70,6 +70,7 @@ To reproduce legacy results, see these branches:
- *CAMB_sources* is the old public `CAMB Sources `_ code.
- *CAMB_v0* is the old Fortran-oriented (gfortran 4.8-compatible) version as used by the Planck 2018 analysis.
- *rayleigh* includes frequency-dependent Rayleigh scattering
+ - *python2* is the last Python 2 compatible version
=============
diff --git a/camb/__init__.py b/camb/__init__.py
index a2d40cc6..953b5a72 100644
--- a/camb/__init__.py
+++ b/camb/__init__.py
@@ -7,7 +7,7 @@
__author__ = "Antony Lewis"
__contact__ = "antony at cosmologist dot info"
__url__ = "https://camb.readthedocs.io"
-__version__ = "1.1.0.1"
+__version__ = "1.1.1"
from . import baseconfig
diff --git a/camb/_config.py b/camb/_config.py
index 68502748..77fbb72b 100644
--- a/camb/_config.py
+++ b/camb/_config.py
@@ -1,3 +1,4 @@
+import os
from .baseconfig import import_property, CAMBError
from ctypes import c_char, c_int, c_bool, c_double
@@ -60,3 +61,6 @@ def __repr__(self):
config = _config()
+
+if os.environ.get('BINDER_LAUNCH_HOST'):
+ config.ThreadNum = 1 # binder is very slow with more than 1 CPU, force 1 by default
diff --git a/camb/cambdll.dll b/camb/cambdll.dll
index 32c7cdcb..37f8c302 100644
Binary files a/camb/cambdll.dll and b/camb/cambdll.dll differ
diff --git a/docs/CAMBdemo.html b/docs/CAMBdemo.html
index 87b6fd03..bb5d8396 100644
--- a/docs/CAMBdemo.html
+++ b/docs/CAMBdemo.html
@@ -1,9 +1,14 @@
-CAMBdemo
+
+CAMBdemo
+
+
+
+
@@ -11747,7 +13089,7 @@
-
+