diff --git a/Manifest.txt b/Manifest.txt
index 283d473c2..8d53b4704 100644
--- a/Manifest.txt
+++ b/Manifest.txt
@@ -46,7 +46,6 @@ lib/pg/basic_type_mapping.rb
 lib/pg/coder.rb
 lib/pg/connection.rb
 lib/pg/constants.rb
-lib/pg/deprecated_constants.rb
 lib/pg/exceptions.rb
 lib/pg/result.rb
 lib/pg/text_decoder.rb
diff --git a/lib/pg.rb b/lib/pg.rb
index 8934f6db2..cd9ca09e0 100644
--- a/lib/pg.rb
+++ b/lib/pg.rb
@@ -70,7 +70,3 @@ def self::connect( *args )
 end # module PG
 
 
-autoload :PGError,  'pg/deprecated_constants'
-autoload :PGconn,   'pg/deprecated_constants'
-autoload :PGresult, 'pg/deprecated_constants'
-
diff --git a/lib/pg/deprecated_constants.rb b/lib/pg/deprecated_constants.rb
deleted file mode 100644
index 42cab041d..000000000
--- a/lib/pg/deprecated_constants.rb
+++ /dev/null
@@ -1,24 +0,0 @@
-# -*- ruby -*-
-#encoding: utf-8
-
-# Warn about use of deprecated constants when this is autoloaded
-unless ENV['PG_SKIP_DEPRECATION_WARNING']
-	callsite = caller(3).first
-
-	warn <<-END_OF_WARNING
-The PGconn, PGresult, and PGError constants are deprecated, and will be
-removed as of version 1.0.
-
-You should use PG::Connection, PG::Result, and PG::Error instead, respectively.
-
-You can disable this warning by setting the PG_SKIP_DEPRECATION_WARNING environment
-variable.
-
-Called from #{callsite}
-	END_OF_WARNING
-end
-
-PGconn   = PG::Connection
-PGresult = PG::Result
-PGError  = PG::Error
-
diff --git a/pg.gemspec b/pg.gemspec
index f4666fc69..eddbb8408 100644
--- a/pg.gemspec
+++ b/pg.gemspec
@@ -1,17 +1,17 @@
 # -*- encoding: utf-8 -*-
-# stub: pg 0.22.0.pre20171227221214 ruby lib
+# stub: pg 0.22.0.pre20180110074041 ruby lib
 # stub: ext/extconf.rb
 
 Gem::Specification.new do |s|
   s.name = "pg".freeze
-  s.version = "0.22.0.pre20171227221214"
+  s.version = "0.22.0.pre20180110074041"
 
   s.required_rubygems_version = Gem::Requirement.new("> 1.3.1".freeze) if s.respond_to? :required_rubygems_version=
   s.require_paths = ["lib".freeze]
   s.authors = ["Michael Granger".freeze, "Lars Kanis".freeze]
   s.cert_chain = ["certs/ged.pem".freeze]
-  s.date = "2017-12-27"
-  s.description = "Pg is the Ruby interface to the {PostgreSQL RDBMS}[http://www.postgresql.org/].\n\nIt works with {PostgreSQL 9.1 and later}[http://www.postgresql.org/support/versioning/].\n\nA small example usage:\n\n  #!/usr/bin/env ruby\n\n  require 'pg'\n\n  # Output a table of current connections to the DB\n  conn = PG.connect( dbname: 'sales' )\n  conn.exec( \"SELECT * FROM pg_stat_activity\" ) do |result|\n    puts \"     PID | User             | Query\"\n    result.each do |row|\n      puts \" %7d | %-16s | %s \" %\n        row.values_at('procpid', 'usename', 'current_query')\n    end\n  end".freeze
+  s.date = "2018-01-10"
+  s.description = "Pg is the Ruby interface to the {PostgreSQL RDBMS}[http://www.postgresql.org/].\n\nIt works with {PostgreSQL 9.2 and later}[http://www.postgresql.org/support/versioning/].\n\nA small example usage:\n\n  #!/usr/bin/env ruby\n\n  require 'pg'\n\n  # Output a table of current connections to the DB\n  conn = PG.connect( dbname: 'sales' )\n  conn.exec( \"SELECT * FROM pg_stat_activity\" ) do |result|\n    puts \"     PID | User             | Query\"\n    result.each do |row|\n      puts \" %7d | %-16s | %s \" %\n        row.values_at('procpid', 'usename', 'current_query')\n    end\n  end".freeze
   s.email = ["ged@FaerieMUD.org".freeze, "lars@greiz-reinsdorf.de".freeze]
   s.extensions = ["ext/extconf.rb".freeze]
   s.extra_rdoc_files = ["Contributors.rdoc".freeze, "History.rdoc".freeze, "Manifest.txt".freeze, "README-OS_X.rdoc".freeze, "README-Windows.rdoc".freeze, "README.ja.rdoc".freeze, "README.rdoc".freeze, "ext/errorcodes.txt".freeze, "Contributors.rdoc".freeze, "History.rdoc".freeze, "README-OS_X.rdoc".freeze, "README-Windows.rdoc".freeze, "README.ja.rdoc".freeze, "README.rdoc".freeze, "POSTGRES".freeze, "LICENSE".freeze, "ext/gvl_wrappers.c".freeze, "ext/pg.c".freeze, "ext/pg_binary_decoder.c".freeze, "ext/pg_binary_encoder.c".freeze, "ext/pg_coder.c".freeze, "ext/pg_connection.c".freeze, "ext/pg_copy_coder.c".freeze, "ext/pg_errors.c".freeze, "ext/pg_result.c".freeze, "ext/pg_text_decoder.c".freeze, "ext/pg_text_encoder.c".freeze, "ext/pg_type_map.c".freeze, "ext/pg_type_map_all_strings.c".freeze, "ext/pg_type_map_by_class.c".freeze, "ext/pg_type_map_by_column.c".freeze, "ext/pg_type_map_by_mri_type.c".freeze, "ext/pg_type_map_by_oid.c".freeze, "ext/pg_type_map_in_ruby.c".freeze, "ext/util.c".freeze]