diff --git a/lib/one_gadget/update.rb b/lib/one_gadget/update.rb
index a55ef20e..1dc750cf 100644
--- a/lib/one_gadget/update.rb
+++ b/lib/one_gadget/update.rb
@@ -7,8 +7,8 @@
 module OneGadget
   # For automatically check update.
   module Update
-    # At least 7 days between check for new version.
-    FREQUENCY = 7 * 24 * 60 * 60
+    # At least 30 days between check for new version.
+    FREQUENCY = 30 * 24 * 60 * 60
     # Path to cache file.
     CACHE_FILE = File.join(ENV['HOME'], '.cache', 'one_gadget', 'update').freeze
 
@@ -28,9 +28,8 @@ def check!
         end
 
         # show update message
-        msg = format("A newer version of OneGadget is available (%s --> %s).\n", OneGadget::VERSION, latest)
-        msg << "Update with: $ gem update one_gadget\n\n"
-        OneGadget::Logger.info(msg)
+        msg = format('A newer version of OneGadget is available (%s --> %s).', OneGadget::VERSION, latest)
+        OneGadget::Helper.ask_update(msg: msg)
       end
 
       private
@@ -38,6 +37,8 @@ def check!
       # check ~/.cache/one_gadget/update
       def need_check?
         cache = cache_file
+        # don't check if not CLI
+        return false unless $stdout.tty?
         return false if cache.nil? # cache file fails, no update check.
         return false if IO.binread(cache).strip == 'never'
 
diff --git a/spec/update_spec.rb b/spec/update_spec.rb
index b9bc4158..0f0b67c3 100644
--- a/spec/update_spec.rb
+++ b/spec/update_spec.rb
@@ -35,7 +35,8 @@
     @hook_cache_file.call do |path|
       expect(described_class.__send__(:need_check?)).to be false
       now = Time.now
-      allow(Time).to receive(:now).and_return(now + 7 * 24 * 3600)
+      allow(Time).to receive(:now).and_return(now + 30 * 24 * 3600)
+      allow($stdout).to receive(:tty?).and_return(true)
       expect(described_class.__send__(:need_check?)).to be true
       IO.binwrite(path, 'never')
       expect(described_class.__send__(:need_check?)).to be false
@@ -53,7 +54,7 @@
 [OneGadget] You have the latest version of OneGadget
       EOS
       stub_const('OneGadget::VERSION', '0.0.0')
-      expect { hook_logger { described_class.check! } }.to output(include(<<-EOS)).to_stdout
+      expect { hook_logger { described_class.check! } }.to output(include(<<-EOS.strip)).to_stdout
 $ gem update one_gadget
       EOS
     end