diff --git a/history.en.md b/history.en.md
index ca1f1681b..4c369ba1b 100644
--- a/history.en.md
+++ b/history.en.md
@@ -1,6 +1,7 @@
 # History
 
  - master/HEAD
+ - 3.8.7 (2021.7.8)
    * Fix odd appearance of the Photon theme. (regression on 3.8.5)
    * Calculate total height of visible tabs more safely.
  - 3.8.6 (2021.7.7)
diff --git a/history.ja.md b/history.ja.md
index e4da04449..19738089f 100644
--- a/history.ja.md
+++ b/history.ja.md
@@ -1,6 +1,7 @@
 # 更新履歴
 
  - master/HEAD
+ - 3.8.7 (2021.7.8)
    * Photonテーマの外観がおかしくなっていたのを修正（3.8.5での後退バグ）
    * タブの高さの合計をより安全に計算するように修正
  - 3.8.6 (2021.7.7)
diff --git a/webextensions/manifest.json b/webextensions/manifest.json
index d572fb931..6f722be54 100644
--- a/webextensions/manifest.json
+++ b/webextensions/manifest.json
@@ -1,7 +1,7 @@
 {
   "manifest_version": 2,
   "name": "__MSG_extensionName__",
-  "version": "3.8.6",
+  "version": "3.8.7",
   "author": "YUKI \"Piro\" Hiroshi",
   "description": "__MSG_extensionDescription__",
   "permissions": [