diff --git a/src/templates/activities/announcements/announcement_created.slack.txt b/src/templates/activities/announcements/announcement_created.slack.txt
index 7561126f..adf491b7 100644
--- a/src/templates/activities/announcements/announcement_created.slack.txt
+++ b/src/templates/activities/announcements/announcement_created.slack.txt
@@ -1,4 +1,4 @@
-**{{ object.author.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」を書きました**
+*{{ object.author.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」を書きました*
 
 ```
 {{  object.body | kfm | striptags | truncatechars_html:150 }}
diff --git a/src/templates/activities/blogs/entry_created.slack.txt b/src/templates/activities/blogs/entry_created.slack.txt
index 7561126f..adf491b7 100644
--- a/src/templates/activities/blogs/entry_created.slack.txt
+++ b/src/templates/activities/blogs/entry_created.slack.txt
@@ -1,4 +1,4 @@
-**{{ object.author.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」を書きました**
+*{{ object.author.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」を書きました*
 
 ```
 {{  object.body | kfm | striptags | truncatechars_html:150 }}
diff --git a/src/templates/activities/comment_added.slack.txt b/src/templates/activities/comment_added.slack.txt
index 0ff2003a..e519d3aa 100644
--- a/src/templates/activities/comment_added.slack.txt
+++ b/src/templates/activities/comment_added.slack.txt
@@ -1,4 +1,4 @@
-**{{ comment.user.nickname }}さんが「{{ comment.content_object }}」にコメントしました <http://{{ site.domain }}{{ comment.get_absolute_url }}>**
+*{{ comment.user.nickname }}さんが「{{ comment.content_object }}」にコメントしました <http://{{ site.domain }}{{ comment.get_absolute_url }}>*
 ```
 {{ comment.comment | kfm | striptags | truncatechars_html:150 }}
 ```
diff --git a/src/templates/activities/created.slack.txt b/src/templates/activities/created.slack.txt
index c0daa772..fa95ca25 100644
--- a/src/templates/activities/created.slack.txt
+++ b/src/templates/activities/created.slack.txt
@@ -1 +1 @@
-**「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」が作成されました**
+*「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」が作成されました*
diff --git a/src/templates/activities/deleted.slack.txt b/src/templates/activities/deleted.slack.txt
index 65f472b8..3a82e251 100644
--- a/src/templates/activities/deleted.slack.txt
+++ b/src/templates/activities/deleted.slack.txt
@@ -1 +1 @@
-**「{{ object.title }}」が削除されました**
+*「{{ object.title }}」が削除されました*
diff --git a/src/templates/activities/events/event_created.slack.txt b/src/templates/activities/events/event_created.slack.txt
index 26b08d5a..86286a2d 100644
--- a/src/templates/activities/events/event_created.slack.txt
+++ b/src/templates/activities/events/event_created.slack.txt
@@ -1,7 +1,7 @@
-**{{ object.organizer.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」を企画しました**
+*{{ object.organizer.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」を企画しました*
 
-**日時**：{{ object.humanized_period }}
-**場所**：{{ object.place }}
+*日時* ：{{ object.humanized_period }}
+*場所* ：{{ object.place }}
 
 ```
 {{ object.body | kfm | striptags | truncatechars_html:150 }}
diff --git a/src/templates/activities/events/event_user_added.slack.txt b/src/templates/activities/events/event_user_added.slack.txt
index 0433ea43..754239ba 100644
--- a/src/templates/activities/events/event_user_added.slack.txt
+++ b/src/templates/activities/events/event_user_added.slack.txt
@@ -1 +1 @@
-**<http://{{ site.domain }}{{ user.get_absolute_url }}|{{ user.nickname }}>さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」に参加しました**
+*<http://{{ site.domain }}{{ user.get_absolute_url }}|{{ user.nickname }}>さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」に参加しました*
diff --git a/src/templates/activities/events/event_user_removed.slack.txt b/src/templates/activities/events/event_user_removed.slack.txt
index 1863d34e..f7a36c68 100644
--- a/src/templates/activities/events/event_user_removed.slack.txt
+++ b/src/templates/activities/events/event_user_removed.slack.txt
@@ -1 +1 @@
-**<http://{{ site.domain }}{{ user.get_absolute_url }}|{{ user.nickname }}>さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」への参加をやめました**
+*<http://{{ site.domain }}{{ user.get_absolute_url }}|{{ user.nickname }}>さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」への参加をやめました*
diff --git a/src/templates/activities/hatenablog/hatenablogentry_created.slack.txt b/src/templates/activities/hatenablog/hatenablogentry_created.slack.txt
index 62077aa7..1beee4fb 100644
--- a/src/templates/activities/hatenablog/hatenablogentry_created.slack.txt
+++ b/src/templates/activities/hatenablog/hatenablogentry_created.slack.txt
@@ -1 +1 @@
-**広報ブログに「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」が投稿されました**
+*広報ブログに「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」が投稿されました*
diff --git a/src/templates/activities/personas/persona_account_added.slack.txt b/src/templates/activities/personas/persona_account_added.slack.txt
index afa4cb86..2306e108 100644
--- a/src/templates/activities/personas/persona_account_added.slack.txt
+++ b/src/templates/activities/personas/persona_account_added.slack.txt
@@ -1 +1 @@
-**{{ object.nickname }}さんが<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ service.label }}アカウント>の情報を追加しました**
+*{{ object.nickname }}さんが<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ service.label }}アカウント>の情報を追加しました*
diff --git a/src/templates/activities/personas/persona_activated.slack.txt b/src/templates/activities/personas/persona_activated.slack.txt
index a6fa0442..d8d6dbf6 100644
--- a/src/templates/activities/personas/persona_activated.slack.txt
+++ b/src/templates/activities/personas/persona_activated.slack.txt
@@ -1,4 +1,4 @@
-**<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.nickname }}>さんが入会しました**
+*<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.nickname }}>さんが入会しました*
 
 ```
 {{  object.body | kfm | striptags | truncatechars_html:150 }}
diff --git a/src/templates/activities/personas/persona_profile_updated.slack.txt b/src/templates/activities/personas/persona_profile_updated.slack.txt
index 4b8f3a71..c5b73577 100644
--- a/src/templates/activities/personas/persona_profile_updated.slack.txt
+++ b/src/templates/activities/personas/persona_profile_updated.slack.txt
@@ -1 +1 @@
-**「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.nickname }}>」さんがプロフィールを更新しました**
+*「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.nickname }}>」さんがプロフィールを更新しました*
diff --git a/src/templates/activities/products/product_created.slack.txt b/src/templates/activities/products/product_created.slack.txt
index dcdb16b6..c39420ea 100644
--- a/src/templates/activities/products/product_created.slack.txt
+++ b/src/templates/activities/products/product_created.slack.txt
@@ -1,4 +1,4 @@
-**「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」が公開されました**
+*「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」が公開されました*
 
 ```
 {{ object.description | kfm | striptags | truncatechars_html:150 }}
diff --git a/src/templates/activities/products/product_release_added.slack.txt b/src/templates/activities/products/product_release_added.slack.txt
index c2a129b9..96ab7bbb 100644
--- a/src/templates/activities/products/product_release_added.slack.txt
+++ b/src/templates/activities/products/product_release_added.slack.txt
@@ -1,4 +1,4 @@
-**{{ object.last_modifier.nickname }}さんが「{{ release.product.title }}」に「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ release.label }}>」を追加しました**
+*{{ object.last_modifier.nickname }}さんが「{{ release.product.title }}」に「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ release.label }}>」を追加しました*
 
 ```
 {{ object.description | kfm | striptags | truncatechars_html:150 }}
diff --git a/src/templates/activities/products/product_screenshot_added.slack.txt b/src/templates/activities/products/product_screenshot_added.slack.txt
index 4ab50333..786887e6 100644
--- a/src/templates/activities/products/product_screenshot_added.slack.txt
+++ b/src/templates/activities/products/product_screenshot_added.slack.txt
@@ -1,4 +1,4 @@
-**{{ object.last_modifier.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」にスクリーンショットを追加しました**
+*{{ object.last_modifier.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」にスクリーンショットを追加しました*
 
 ```
 {{ object.description | kfm | striptags | truncatechars_html:150 }}
diff --git a/src/templates/activities/projects/project_created.slack.txt b/src/templates/activities/projects/project_created.slack.txt
index 2d32ddc4..1ac996ba 100644
--- a/src/templates/activities/projects/project_created.slack.txt
+++ b/src/templates/activities/projects/project_created.slack.txt
@@ -1,4 +1,4 @@
-**{{ object.administrator.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」を発足しました**
+*{{ object.administrator.nickname }}さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」を発足しました*
 
 ```
 {{ object.body | kfm | striptags | truncatechars_html:150 }}
diff --git a/src/templates/activities/projects/project_user_added.slack.txt b/src/templates/activities/projects/project_user_added.slack.txt
index 0433ea43..754239ba 100644
--- a/src/templates/activities/projects/project_user_added.slack.txt
+++ b/src/templates/activities/projects/project_user_added.slack.txt
@@ -1 +1 @@
-**<http://{{ site.domain }}{{ user.get_absolute_url }}|{{ user.nickname }}>さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」に参加しました**
+*<http://{{ site.domain }}{{ user.get_absolute_url }}|{{ user.nickname }}>さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」に参加しました*
diff --git a/src/templates/activities/projects/project_user_removed.slack.txt b/src/templates/activities/projects/project_user_removed.slack.txt
index 1863d34e..f7a36c68 100644
--- a/src/templates/activities/projects/project_user_removed.slack.txt
+++ b/src/templates/activities/projects/project_user_removed.slack.txt
@@ -1 +1 @@
-**<http://{{ site.domain }}{{ user.get_absolute_url }}|{{ user.nickname }}>さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」への参加をやめました**
+*<http://{{ site.domain }}{{ user.get_absolute_url }}|{{ user.nickname }}>さんが「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object }}>」への参加をやめました*
diff --git a/src/templates/activities/updated.slack.txt b/src/templates/activities/updated.slack.txt
index ede3c786..9b585ebb 100644
--- a/src/templates/activities/updated.slack.txt
+++ b/src/templates/activities/updated.slack.txt
@@ -1 +1 @@
-**「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」が編集されました**
+*「<http://{{ site.domain }}{{ object.get_absolute_url }}|{{ object.title }}>」が編集されました*