diff --git a/lib/pb/serializable/dsl.rb b/lib/pb/serializable/dsl.rb
index a50a55a..93446f5 100644
--- a/lib/pb/serializable/dsl.rb
+++ b/lib/pb/serializable/dsl.rb
@@ -20,7 +20,7 @@ def message(klass)
       # @raise [Pb::Serializer::UnknownFieldError] if the field does not defined in .proto
       # @raise [Pb::Serializer::InvalidAttributeOptionError] if unknown options are passed
       def attribute(name, opts = {})
-        raise ::Pb::Serializer::MissingMessageTypeError, "message specificaiton is missed" unless __pb_serializer_message_class
+        raise ::Pb::Serializer::MissingMessageTypeError, "message specification is missed" unless __pb_serializer_message_class
 
         fd = __pb_serializer_message_class.descriptor.find { |fd| fd.name.to_sym == name }
 
diff --git a/lib/pb/serializer.rb b/lib/pb/serializer.rb
index f8c97e7..2685cce 100644
--- a/lib/pb/serializer.rb
+++ b/lib/pb/serializer.rb
@@ -44,7 +44,7 @@ def missing_field_behavior=(v)
     class << self
       # @example
       #   Pb::Serializer.configuration do |c|
-      #     c.missing_field_behavior = :raise  # :raise, :warn or :ignore (defualt: :raise)
+      #     c.missing_field_behavior = :raise  # :raise, :warn or :ignore (default: :raise)
       #   end
       # @yield [c]
       # @yieldparam [Configuration] config
@@ -55,7 +55,7 @@ def configure
 
       # @return [Pb::Serializer::Configuration]
       def configuration
-        @configuraiton ||= Configuration.new
+        @configuration ||= Configuration.new
       end
 
       # @return [Logger]
diff --git a/spec/examples/errors_spec.rb b/spec/examples/errors_spec.rb
index 5af53d2..9d04f5c 100644
--- a/spec/examples/errors_spec.rb
+++ b/spec/examples/errors_spec.rb
@@ -17,7 +17,7 @@
     }.to raise_error Pb::Serializer::InvalidAttributeOptionError
   end
 
-  it 'raises an error when unknown fied is declared' do
+  it 'raises an error when unknown field is declared' do
     expect {
       Class.new(Pb::Serializer::Base) do
         message TestFixture::Simple::Message