diff --git a/activesupport/lib/active_support/encrypted_configuration.rb b/activesupport/lib/active_support/encrypted_configuration.rb
index b403048627..c52d3869de 100644
--- a/activesupport/lib/active_support/encrypted_configuration.rb
+++ b/activesupport/lib/active_support/encrypted_configuration.rb
@@ -22,6 +22,12 @@ def read
       ""
     end
 
+    def write(contents)
+      deserialize(contents)
+
+      super
+    end
+
     def config
       @config ||= deserialize(read).deep_symbolize_keys
     end
@@ -36,7 +42,7 @@ def serialize(config)
       end
 
       def deserialize(config)
-        config.present? ? YAML.load(config) : {}
+        config.present? ? YAML.load(config, content_path) : {}
       end
   end
 end
diff --git a/activesupport/test/encrypted_configuration_test.rb b/activesupport/test/encrypted_configuration_test.rb
index 471faa8c12..0bc915be82 100644
--- a/activesupport/test/encrypted_configuration_test.rb
+++ b/activesupport/test/encrypted_configuration_test.rb
@@ -51,6 +51,14 @@ class EncryptedConfigurationTest < ActiveSupport::TestCase
     assert_equal "things", @credentials[:new]
   end
 
+  test "raise error when writing an invalid format value" do
+    assert_raise(Psych::SyntaxError) do
+      @credentials.change do |config_file|
+        config_file.write "login: *login\n  username: dummy"
+      end
+    end
+  end
+
   test "raises key error when accessing config via bang method" do
     assert_raise(KeyError) { @credentials.something! }
   end