diff --git a/CHANGELOG.md b/CHANGELOG.md
index e4a852d9..8f977d42 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,8 +1,13 @@
 # Changelog for Jikka
 
+## 2021-07-21: v5.0.10.0
+
+-   The generated C++ code is optimized.
+-   `list.append` is added in the restricted Python.
+
 ## 2021-07-14: v5.0.9.0
 
--   The generated C++ stops being functional and becomes natural.
+-   The generated C++ code becomes more natural.
 -   The restricted Python allows to write `main` function and uses it to analyze input/output format.
 
 Input:
diff --git a/package.yaml b/package.yaml
index 8344d636..2a11c13c 100644
--- a/package.yaml
+++ b/package.yaml
@@ -1,5 +1,5 @@
 name:                Jikka
-version:             5.0.9.0
+version:             5.0.10.0
 github:              "kmyk/Jikka"
 license:             Apache
 author:              "Kimiyuki Onaka"