diff --git a/backend/app/controllers/tags_controller.rb b/backend/app/controllers/tags_controller.rb
index 3785a9e..7fdcc22 100644
--- a/backend/app/controllers/tags_controller.rb
+++ b/backend/app/controllers/tags_controller.rb
@@ -302,6 +302,11 @@ class TagsController < ApplicationController
       NicoTagVersionRecorder.record!(tag:, event_type:, created_by_user:)
     else
       TagVersionRecorder.record!(tag:, event_type:, created_by_user:)
+      if tag.has_wiki
+        WikiVersionRecorder.record!(page: tag.tag_name.wiki_page,
+                                    event_type: :update,
+                                    created_by_user:)
+      end
     end
   end
 
diff --git a/backend/app/models/wiki_page.rb b/backend/app/models/wiki_page.rb
index 8d3feec..83a7f1b 100644
--- a/backend/app/models/wiki_page.rb
+++ b/backend/app/models/wiki_page.rb
@@ -13,6 +13,8 @@ class WikiPage < ApplicationRecord
            foreign_key: :redirect_page_id,
            dependent: :nullify
 
+  has_many :wiki_versions
+
   belongs_to :tag_name
   validates :tag_name, presence: true
 
diff --git a/backend/app/models/wiki_version.rb b/backend/app/models/wiki_version.rb
new file mode 100644
index 0000000..4f55804
--- /dev/null
+++ b/backend/app/models/wiki_version.rb
@@ -0,0 +1,8 @@
+class WikiVersion < ApplicationRecord
+  include VersionRecord
+
+  belongs_to :wiki_page
+
+  validates :title, presence: true
+  validates :body, presence: true
+end
diff --git a/backend/app/services/wiki/commit.rb b/backend/app/services/wiki/commit.rb
index c0be98a..f3e325d 100644
--- a/backend/app/services/wiki/commit.rb
+++ b/backend/app/services/wiki/commit.rb
@@ -21,7 +21,7 @@ module Wiki
     end
 
     def content! body:, message:, base_revision_id:
-      normalised = normalise_body(body)
+      normalised = normalise_body(body).gsub(/\n+$/, '')
       lines = split_lines(normalised)
 
       line_shas = lines.map { |line| Digest::SHA256.hexdigest(line) }
@@ -37,10 +37,22 @@ module Wiki
           current_id = @page.wiki_revisions.maximum(:id)
           if current_id && current_id != base_revision_id.to_i
             raise Conflict,
-                "競合が発生してゐます（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
+                "競合が発生してゐます" +
+                "（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
           end
         end
 
+        @page.update!(body: normalised)
+
+        WikiVersionRecorder.record!(
+            page: { title: @page.title, body: normalised },
+            event_type: @page.wiki_versions.exists? ? :update : :create,
+            created_by_user: @created_user)
+        tag = @page.tag_name.tag
+        if tag
+          TagVersionRecorder.record!(tag:, event_type: :update, created_by_user: @created_user)
+        end
+
         rev = WikiRevision.create!(
             wiki_page:        @page,
             base_revision_id:,
@@ -54,47 +66,23 @@ module Wiki
         rows = line_ids.each_with_index.map do |line_id, pos|
           { wiki_revision_id: rev.id, wiki_line_id: line_id, position: pos }
         end
-        WikiRevisionLine.insert_all!(rows)
+        WikiRevisionLine.insert_all!(rows) if rows.any?
 
         rev
       end
     end
 
-    def redirect! redirect_page:, message:, base_revision_id:
-      ActiveRecord::Base.transaction do
-        @page.lock!
-
-        if base_revision_id.present?
-          current_id = @page.wiki_revisions.maximum(:id)
-          if current_id && current_id != base_revision_id.to_i
-            raise Conflict,
-                "競合が発生してゐます（現在の Id.：#{ current_id }，ベース Id.：#{ base_revision_id }）．"
-          end
-        end
-
-        WikiRevision.create!(
-            wiki_page:        @page,
-            base_revision_id:,
-            created_user:     @created_user,
-            kind:             :redirect,
-            redirect_page:,
-            message:,
-            lines_count:      0,
-            tree_sha256:      nil)
-      end
-    end
+    def redirect!(redirect_page:, message:, base_revision_id:) = raise '廃止しました．'
 
     private
 
     def normalise_body body
       s = body.to_s
-      s.gsub!("\r\n", "\n")
+      s.gsub!(/\r\n?/, "\n")
       s.encode('UTF-8', invalid: :replace, undef: :replace, replace: '🖕')
     end
 
-    def split_lines body
-      body.split("\n")
-    end
+    def split_lines(body) = body.split("\n")
 
     def upsert_lines! lines, line_shas
       now = Time.current
diff --git a/backend/app/services/wiki_version_recorder.rb b/backend/app/services/wiki_version_recorder.rb
new file mode 100644
index 0000000..a9bebe4
--- /dev/null
+++ b/backend/app/services/wiki_version_recorder.rb
@@ -0,0 +1,17 @@
+class WikiVersionRecorder < VersionRecorder
+  def self.record! page:, event_type:, created_by_user:
+    new(page:, event_type:, created_by_user:).record!
+  end
+
+  def initialize page:, event_type:, created_by_user:
+    super(record: page, event_type:, created_by_user:)
+  end
+
+  private
+
+  def version_class = WikiVersion
+  def version_association = :wiki_versions
+  def record_key = :wiki_page
+
+  def snapshot_attributes = { title: @record.title, body: @record.body }
+end
diff --git a/backend/db/migrate/20260426120600_create_wiki_versions.rb b/backend/db/migrate/20260426120600_create_wiki_versions.rb
index 2584962..756597f 100644
--- a/backend/db/migrate/20260426120600_create_wiki_versions.rb
+++ b/backend/db/migrate/20260426120600_create_wiki_versions.rb
@@ -27,7 +27,7 @@ class CreateWikiVersions < ActiveRecord::Migration[8.0]
     add_column :wiki_pages, :body, :text, after: :tag_name_id
 
     create_table :wiki_versions do |t|
-      t.references :wiki_page , null: false, foreign_key: true
+      t.references :wiki_page, null: false, foreign_key: true
       t.integer :version_no, null: false
       t.string :event_type, null: false
       t.string :title, null: false