diff --git a/rubygem-pg-1.1.4-add-feature-to-set-testing-port.patch b/rubygem-pg-1.1.4-add-feature-to-set-testing-port.patch
new file mode 100644
index 0000000..c42f3b3
--- /dev/null
+++ b/rubygem-pg-1.1.4-add-feature-to-set-testing-port.patch
@@ -0,0 +1,40 @@
+diff --git a/spec/helpers.rb b/spec/helpers.rb
+index 4362750..9b064ea 100755
+--- a/spec/helpers.rb
++++ b/spec/helpers.rb
+@@ -199,8 +199,8 @@ module PG::TestingHelpers
+ 		@test_pgdata = TEST_DIRECTORY + 'data'
+ 		@test_pgdata.mkpath
+ 
+-		@port = 54321
+-		ENV['PGPORT'] = @port.to_s
++		ENV['PGPORT'] ||= "54321"
++		@port = ENV['PGPORT'].to_i
+ 		ENV['PGHOST'] = 'localhost'
+ 		@conninfo = "host=localhost port=#{@port} dbname=test"
+ 
+diff --git a/spec/pg/connection_spec.rb b/spec/pg/connection_spec.rb
+index a1d7e42..1f6cd8d 100755
+--- a/spec/pg/connection_spec.rb
++++ b/spec/pg/connection_spec.rb
+@@ -241,7 +241,7 @@ describe PG::Connection do
+ 		expect( @conn.db ).to eq( "test" )
+ 		expect( @conn.user ).to be_a_kind_of( String )
+ 		expect( @conn.pass ).to eq( "" )
+-		expect( @conn.port ).to eq( 54321 )
++		expect( @conn.port ).to eq( @port )
+ 		expect( @conn.tty ).to eq( "" )
+ 		expect( @conn.options ).to eq( "" )
+ 	end
+@@ -741,7 +741,7 @@ describe PG::Connection do
+ 	it "can return the default connection options as a Hash" do
+ 		expect( described_class.conndefaults_hash ).to be_a( Hash )
+ 		expect( described_class.conndefaults_hash ).to include( :user, :password, :dbname, :host, :port )
+-		expect( ['5432', '54321'] ).to include( described_class.conndefaults_hash[:port] )
++		expect( ['5432', '54321', @port.to_s] ).to include( described_class.conndefaults_hash[:port] )
+ 		expect( @conn.conndefaults_hash ).to eq( described_class.conndefaults_hash )
+ 	end
+ 
+-- 
+2.21.0
+
diff --git a/rubygem-pg.spec b/rubygem-pg.spec
index bdd3fd3..2d8c3af 100644
--- a/rubygem-pg.spec
+++ b/rubygem-pg.spec
@@ -3,7 +3,7 @@
 
 Name: rubygem-%{gem_name}
 Version: 1.0.0
-Release: 1%{?dist}
+Release: 2%{?dist}
 Summary: A Ruby interface to the PostgreSQL RDBMS
 # Upstream license clarification (https://bitbucket.org/ged/ruby-pg/issue/72/)
 #
@@ -16,6 +16,9 @@ Source0: https://rubygems.org/gems/%{gem_name}-%{version}.gem
 # Disable RPATH.
 # https://bitbucket.org/ged/ruby-pg/issue/183
 Patch0: rubygem-pg-0.17.1-remove-rpath.patch
+# Add feature to set testing port.
+# https://github.com/ged/ruby-pg/commit/104ec67
+Patch1: rubygem-pg-1.1.4-add-feature-to-set-testing-port.patch
 BuildRequires: ruby(release)
 BuildRequires: rubygems-devel
 BuildRequires: ruby-devel
@@ -43,6 +46,7 @@ Documentation for %{name}.
 %setup -q -n  %{gem_name}-%{version}
 
 %patch0 -p1
+%patch1 -p1
 
 %build
 # Create the gem as gem install only works on a gem file
@@ -86,7 +90,9 @@ done
 pushd .%{gem_instdir}
 # Set --verbose to show detail log by $VERBOSE.
 # See https://github.com/ged/ruby-pg/blob/master/spec/helpers.rb $VERBOSE
-ruby -S --verbose \
+# Assign a random port to consider a case of multi builds in parallel in a host.
+# https://github.com/ged/ruby-pg/pull/39
+PGPORT="$((54321 + ${RANDOM} % 1000))" ruby -S --verbose \
   rspec -I$(dirs +1)%{gem_extdir_mri} -f d spec
 popd
 
@@ -115,6 +121,9 @@ popd
 %{gem_instdir}/spec
 
 %changelog
+* Thu May 23 2019 Jun Aruga <jaruga@redhat.com> - 1.0.0-2
+- Assign a random testing port.
+
 * Tue Feb 13 2018 Vít Ondruch <vondruch@redhat.com> - 1.0.0-1
 - Update to pg 1.0.0.