diff --git a/oml/changelog.py b/oml/changelog.py
index 3f89f47..55dc853 100644
--- a/oml/changelog.py
+++ b/oml/changelog.py
@@ -36,14 +36,14 @@ def add_record(action, *args, **kwargs):
     revision = next_revision()
 
     data = [revision, timestamp, [action] + list(args)]
-    data = json.dumps(data, ensure_ascii=False)
+    data = json.dumps(data, ensure_ascii=False).encode('utf-8')
 
     path = changelog_path()
     if os.path.exists(path):
-        mode = 'a'
+        mode = 'ab'
         state.changelog_size = os.path.getsize(path)
     else:
-        mode = 'w'
+        mode = 'wb'
         state.changelog_size = 0
     makefolder(path)
     with open(path, mode) as fd:
diff --git a/oml/library.py b/oml/library.py
index 3c17ed0..09cc474 100644
--- a/oml/library.py
+++ b/oml/library.py
@@ -1,4 +1,5 @@
 # -*- coding: utf-8 -*-
+import codecs
 import json
 import os
 import time
@@ -52,7 +53,7 @@ class Peer(object):
     def apply_log(self):
         changes = []
         if os.path.exists(self._logpath):
-            with open(self._logpath) as fd:
+            with codecs.open(self._logpath, 'r', encoding='utf-8') as fd:
                 for line in fd:
                     if line:
                         try: