diff --git a/CHANGELOG b/CHANGELOG
index 202265f..afa840b 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,7 @@
+v0.3.1 (unreleased):
+
+- Fixed a bug related to Python 3 compatibility.
+
 v0.3 (released June 7, 2015):
 
 - Added support for Python 3.
diff --git a/gitup/__init__.py b/gitup/__init__.py
index f031df0..dd0412e 100644
--- a/gitup/__init__.py
+++ b/gitup/__init__.py
@@ -10,5 +10,5 @@ gitup: the git repository updater
 __author__ = "Ben Kurtovic"
 __copyright__ = "Copyright (C) 2011-2015 Ben Kurtovic"
 __license__ = "MIT License"
-__version__ = "0.3"
+__version__ = "0.3.1.dev0"
 __email__ = "ben.kurtovic@gmail.com"
diff --git a/gitup/config.py b/gitup/config.py
index f1cab54..007a42d 100644
--- a/gitup/config.py
+++ b/gitup/config.py
@@ -46,7 +46,7 @@ def _load_config_file():
     _migrate_old_config_path()
     config = configparser.SafeConfigParser()
     # Don't lowercase option names, because we are storing paths there:
-    config.optionxform = str
+    config.optionxform = lambda opt: opt
     config.read(_get_config_path())
     return config
 
@@ -55,7 +55,7 @@ def _save_config_file(config):
     _migrate_old_config_path()
     cfg_path = _get_config_path()
     _ensure_dirs(cfg_path)
-    with open(cfg_path, "wb") as config_file:
+    with open(cfg_path, "w") as config_file:
         config.write(config_file)
 
 def get_bookmarks():