diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6330eea6a..055001b1b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,9 @@
 
 ## 1.1
 
+### 1.1.1
+- Updated signing key
+
 ### 1.1.0
 - Remove `Mobility::Plugins::Attributes#each`
   ([#475](https://github.com/shioyama/mobility/pull/475))
diff --git a/README.md b/README.md
index 26ee038ad..af9ed17d7 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,7 @@ Installation
 Add this line to your application's Gemfile:
 
 ```ruby
-gem 'mobility', '~> 1.1.0'
+gem 'mobility', '~> 1.1.1'
 ```
 
 ### ActiveRecord (Rails)
diff --git a/certs/shioyama.pem b/certs/shioyama.pem
index b124d18a0..cc022e53e 100644
--- a/certs/shioyama.pem
+++ b/certs/shioyama.pem
@@ -1,25 +1,25 @@
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 -----END CERTIFICATE-----
diff --git a/lib/mobility/version.rb b/lib/mobility/version.rb
index 20f6712c8..84072f1a4 100644
--- a/lib/mobility/version.rb
+++ b/lib/mobility/version.rb
@@ -8,7 +8,7 @@ def self.gem_version
   module VERSION
     MAJOR = 1
     MINOR = 1
-    TINY = 0
+    TINY = 1
     PRE = nil
 
     STRING = [MAJOR, MINOR, TINY, PRE].compact.join(".")