diff --git a/.gitignore b/.gitignore
index 8fb891c..e96d107 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,3 +6,5 @@
 /concurrent-ruby-1.0.4.gem
 /concurrent-ruby-1.0.5-specs.tar.gz
 /concurrent-ruby-1.0.5.gem
+/concurrent-ruby-1.1.5-specs.tar.gz
+/concurrent-ruby-1.1.5.gem
diff --git a/concurrent-ruby-1.0.5-fix-inspect-output.patch b/concurrent-ruby-1.0.5-fix-inspect-output.patch
deleted file mode 100644
index b8e1b84..0000000
--- a/concurrent-ruby-1.0.5-fix-inspect-output.patch
+++ /dev/null
@@ -1,18 +0,0 @@
-diff --git a/lib/concurrent/map.rb b/lib/concurrent/map.rb
-index f3aa55d5..34696efc 100644
---- a/lib/concurrent/map.rb
-+++ b/lib/concurrent/map.rb
-@@ -210,12 +210,8 @@ module Concurrent
-     undef :freeze
- 
-     # @!visibility private
--    DEFAULT_OBJ_ID_STR_WIDTH = 0.size == 4 ? 7 : 14 # we want to look "native", 7 for 32-bit, 14 for 64-bit
--    # override default #inspect() method: firstly, we don't want to be spilling our guts (i-vars), secondly, MRI backend's
--    # #inspect() call on its @backend i-var will bump @backend's iter level while possibly yielding GVL
-     def inspect
--      id_str = (object_id << 1).to_s(16).rjust(DEFAULT_OBJ_ID_STR_WIDTH, '0')
--      "#<#{self.class.name}:0x#{id_str} entries=#{size} default_proc=#{@default_proc.inspect}>"
-+      format '%s entries=%d default_proc=%s>', to_s[0..-2], size.to_s, @default_proc.inspect
-     end
- 
-     private
diff --git a/rubygem-concurrent-ruby.spec b/rubygem-concurrent-ruby.spec
index bcee149..06942a4 100644
--- a/rubygem-concurrent-ruby.spec
+++ b/rubygem-concurrent-ruby.spec
@@ -2,18 +2,15 @@
 %global gem_name concurrent-ruby
 
 Name: rubygem-%{gem_name}
-Version: 1.0.5
-Release: 6%{?dist}
+Version: 1.1.5
+Release: 1%{?dist}
 Summary: Modern concurrency tools for Ruby
 License: MIT
 URL: http://www.concurrent-ruby.com
 Source0: https://rubygems.org/gems/%{gem_name}-%{version}.gem
 # git clone https://github.com/ruby-concurrency/concurrent-ruby.git && cd concurrent-ruby
-# git checkout v1.0.5 && tar czvf concurrent-ruby-1.0.5-specs.tar.gz spec/
+# git archive -v -o concurrent-ruby-1.1.5-specs.tar.gz v1.1.5 spec/
 Source1: %{gem_name}-%{version}-specs.tar.gz
-# Avoid sporadic test failures due to wrong object_id formatting.
-# https://github.com/ruby-concurrency/concurrent-ruby/pull/651
-Patch1: concurrent-ruby-1.0.5-fix-inspect-output.patch
 BuildRequires: ruby(release)
 BuildRequires: rubygems-devel
 BuildRequires: ruby >= 1.9.3
@@ -38,17 +35,11 @@ BuildArch: noarch
 Documentation for %{name}.
 
 %prep
-gem unpack %{SOURCE0}
-
-%setup -q -D -T -n  %{gem_name}-%{version}
-
-gem spec %{SOURCE0} -l --ruby > %{gem_name}.gemspec
-
-%patch1 -p1
+%setup -q -n %{gem_name}-%{version} -b 1
 
 %build
 # Create the gem as gem install only works on a gem file
-gem build %{gem_name}.gemspec
+gem build ../%{gem_name}-%{version}.gemspec
 
 # %%gem_install compiles any C extensions and installs the gem into ./%%gem_dir
 # by default, so that we can move it into the buildroot in %%install
@@ -60,10 +51,9 @@ cp -a .%{gem_dir}/* \
         %{buildroot}%{gem_dir}/
 
 
-# Run the test suite
 %check
 pushd .%{gem_instdir}
-tar xzf %{SOURCE1}
+ln -s %{_builddir}/spec spec
 
 # -edge is not part of this gem.
 sed -i '/require.*concurrent-edge/ s/^/#/' spec/spec_helper.rb
@@ -73,15 +63,22 @@ sed -i '/require.*concurrent-edge/ s/^/#/' spec/spec_helper.rb
 sed -i '/allow_c_extensions?/,/^      end/ s/^/#/' spec/concurrent/atomic/atomic_reference_spec.rb
 
 # Exclude the -edge test cases.
+# Also exclude `scheduled_task_spec` and `timer_task_spec`,
+# because these are pretty unstable:
+# https://github.com/ruby-concurrency/concurrent-ruby/issues/824
 rspec -rspec_helper \
-  --exclude-pattern 'spec/concurrent/{actor_spec.rb,channel_spec.rb,lazy_register_spec.rb,channel/**/*,atomic/atomic_markable_reference_spec.rb,edge/**/*}' \
+  -fd \
+  --exclude-pattern 'spec/concurrent/{actor_spec.rb,channel_spec.rb,lazy_register_spec.rb,channel/**/*,edge/**/*,promises_spec.rb,throttle_spec.rb,cancellation_spec.rb,scheduled_task_spec.rb,timer_task_spec.rb}' \
   spec
 
+
 popd
 
 %files
 %dir %{gem_instdir}
-%license %{gem_instdir}/LICENSE.txt
+%license %{gem_instdir}/LICENSE.md
+# Containst just some Java sources. Very likely included by mistake.
+%exclude %{gem_instdir}/ext
 %{gem_libdir}
 %exclude %{gem_cache}
 %{gem_spec}
@@ -89,9 +86,14 @@ popd
 %files doc
 %doc %{gem_docdir}
 %doc %{gem_instdir}/CHANGELOG.md
+%{gem_instdir}/Gemfile
 %doc %{gem_instdir}/README.md
+%{gem_instdir}/Rakefile
 
 %changelog
+* Mon Sep 16 2019 Vít Ondruch <vondruch@redhat.com> - 1.1.5-1
+- Update to Concurrent Ruby 1.1.5.
+
 * Fri Jul 26 2019 Fedora Release Engineering <releng@fedoraproject.org> - 1.0.5-6
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild
 
diff --git a/sources b/sources
index 3dbf1ad..a3e0fe7 100644
--- a/sources
+++ b/sources
@@ -1,2 +1,2 @@
-SHA512 (concurrent-ruby-1.0.5-specs.tar.gz) = f13da35b9b6cce1182d822723811b27aa661c3dfd231e2d3ace09451ee01f737d343d1d18f5debc296b1534ef0b6a919e679a8ef693a7d75b557e65d19432ef0
-SHA512 (concurrent-ruby-1.0.5.gem) = 523df60096e77a377405b71f9133f28284ca73284bb52456bf1e1a38dbb34c593b3aa2ed9ceb019afbed4805ba2bc3d7c846d3a66139924ec7fa0ccb3fcf9324
+SHA512 (concurrent-ruby-1.1.5-specs.tar.gz) = 74f1de9259c30dfdfba54be065fd090bc47df6543af811fc76cf8022408435cbbfa64eb92d4acc3c46cd1b5a2ed5497d0c852779174a2ec0503617f227ce8b17
+SHA512 (concurrent-ruby-1.1.5.gem) = 357fa6bbf65ff4143adba9de6713d28eacb03170b3b4218f53d80433de13ba50b1c3741a62ec355a3aa01388bcbd059e1bca3dd82c88cf56b8b3110c24b37613