diff --git a/setup.py b/setup.py
index d01565558..00667dd93 100644
--- a/setup.py
+++ b/setup.py
@@ -96,17 +96,9 @@ elif platform == 'FreeBSD':
 elif platform == 'Darwin':
     ext_modules.append(Extension('attic.platform_darwin', [platform_darwin_source]))
 
-# msgpack pure python data corruption in some versions.
-# The compiled C-version of python-msgpack was not affected.
-# So, IF you had a compiler installed AND you did not force the pure-python
-# version, you likely were not affected by the issue.
-# python-msgpack <=0.4.2 is OK, 0.4.5 is latest release, but bug was fixed
-# in repo.
-# Details see:
-# https://github.com/jborg/attic/issues/171
-# https://github.com/jborg/attic/issues/185
-# https://github.com/msgpack/msgpack-python/issues/124
-install_requires=['msgpack-python<=0.4.2,>0.4.5']
+# msgpack pure python data corruption was fixed in 0.4.6.
+# Also, we might use some rather recent API features.
+install_requires=['msgpack-python>=0.4.6']
 if sys.version_info < (3, 3):
     install_requires.append('backports.lzma')