diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8184763..d6a7884 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # Change Log
 
+## 10.6.0 / 2020-11-25
+
+-   [#116](https://github.com/online-judge-tools/api-client/pull/116) [breaking changes] finished Python 3.5 support
+    -   This breaks some environments, but such environments already reached EOL. The major version is not incremented.
+-   [#120](https://github.com/online-judge-tools/api-client/pull/120) fix an issue about submissions to Codeforces
+
 ## 10.5.0 / 2020-10-14
 
 -   [#112](https://github.com/online-judge-tools/api-client/pull/112) deprecate the feature to get detailed info from submissions on AtCoder. The code is broken by update of AtCoder and replaced with placeholders.
diff --git a/onlinejudge/__about__.py b/onlinejudge/__about__.py
index e86750d..db6fd13 100644
--- a/onlinejudge/__about__.py
+++ b/onlinejudge/__about__.py
@@ -4,6 +4,6 @@
 __email__ = 'kimiyuki95@gmail.com'
 __license__ = 'MIT License'
 __url__ = 'https://github.com/online-judge-tools/api-client'
-__version_info__ = (10, 5, 0, 'final', 0)
+__version_info__ = (10, 6, 0, 'final', 0)
 __version__ = '.'.join(map(str, __version_info__[:3]))
 __description__ = 'API client to develop tools for competitive programming'