diff --git a/CHANGES.rst b/CHANGES.rst
index f3f1e2fc36ec43a4f2094f4f1a686417f6065d4c..60fe604c57bfa38d6201e8c3720ac068eb0d83a7 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -9,6 +9,9 @@ Version 2.0.1
 
 Release date to be decided.
 
+- Fix POST requests to the HTTP/RPC+JSON webservice. This was a regression
+  from version 2.0.beta-33. Thanks to Ken Doig for reporting the issue.
+
 
 Version 2.0.0
 -------------
diff --git a/requirements.txt b/requirements.txt
index dc3e7ac8f073909ed8ce64496ae5ff44be2c0e5d..8913dd858a5f682a0571f1c1c28d5d70a096c422 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@ pyparsing==2.0.1
 pytz==2013.9
 requests==2.2.1
 simplejson==3.3.3
-spyne==2.10.10
+-e git+https://github.com/LUMC/spyne.git@spyne-2.10.10-mutalyzer#egg=spyne
 suds==0.4
 wsgiref==0.1.2
 xlrd==0.9.2