diff --git a/app/models/project_wiki.rb b/app/models/project_wiki.rb
index 231973fa543353507d42e8d11df59945da4886d4..b5fec38378b9851200eea31ed1283d03527a4cd9 100644
--- a/app/models/project_wiki.rb
+++ b/app/models/project_wiki.rb
@@ -86,6 +86,8 @@ class ProjectWiki
     commit = commit_details(:created, message, title)
 
     wiki.write_page(title, format, content, commit)
+
+    update_project_activity
   rescue Gollum::DuplicatePageError => e
     @error_message = "Duplicate page: #{e.message}"
     return false
@@ -95,10 +97,14 @@ class ProjectWiki
     commit = commit_details(:updated, message, page.title)
 
     wiki.update_page(page, page.name, format, content, commit)
+
+    update_project_activity
   end
 
   def delete_page(page, message = nil)
     wiki.delete_page(page, commit_details(:deleted, message, page.title))
+
+    update_project_activity
   end
 
   def page_title_and_dir(title)
@@ -146,4 +152,8 @@ class ProjectWiki
   def path_to_repo
     @path_to_repo ||= File.join(Gitlab.config.gitlab_shell.repos_path, "#{path_with_namespace}.git")
   end
+
+  def update_project_activity
+    @project.touch(:last_activity_at)
+  end
 end
diff --git a/spec/models/project_wiki_spec.rb b/spec/models/project_wiki_spec.rb
index 9f6cdeeaa962b1e0b8245d043628f4a65f085b18..3b8891444476f7a48c7b06337eacaa426da29b41 100644
--- a/spec/models/project_wiki_spec.rb
+++ b/spec/models/project_wiki_spec.rb
@@ -184,6 +184,12 @@ describe ProjectWiki do
       subject.create_page("test page", "some content", :markdown, "commit message")
       expect(subject.pages.first.page.version.message).to eq("commit message")
     end
+
+    it 'updates project activity' do
+      expect(subject).to receive(:update_project_activity)
+
+      subject.create_page('Test Page', 'This is content')
+    end
   end
 
   describe "#update_page" do
@@ -205,6 +211,12 @@ describe ProjectWiki do
     it "sets the correct commit message" do
       expect(@page.version.message).to eq("updated page")
     end
+
+    it 'updates project activity' do
+      expect(subject).to receive(:update_project_activity)
+
+      subject.update_page(@gollum_page, 'Yet more content', :markdown, 'Updated page again')
+    end
   end
 
   describe "#delete_page" do
@@ -217,6 +229,12 @@ describe ProjectWiki do
       subject.delete_page(@page)
       expect(subject.pages.count).to eq(0)
     end
+
+    it 'updates project activity' do
+      expect(subject).to receive(:update_project_activity)
+
+      subject.delete_page(@page)
+    end
   end
 
   private