diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index a94ecd7a..b74ee513 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -42,11 +42,17 @@ jobs:
       - lint
     strategy:
       matrix:
-        rails: ['5.2', '6.0.4', '6.1']
-        ruby: ['2.6', '2.7', '3.0']
+        rails: ['5.2', '6.0.4', '6.1', '7.0']
+        ruby: ['2.6', '2.7', '3.0', '3.1']
         exclude:
           - rails: '5.2'
             ruby: '3.0'
+          - rails: '5.2'
+            ruby: '3.1'
+          - rails: '7.0'
+            ruby: '2.6'
+          - rails: '7.0'
+            ruby: '2.7'
     runs-on: ubuntu-latest
     env:
       RAILS_VERSION: ${{ matrix.rails }}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index b7d911a0..c0022b92 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,8 +8,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Indonesian translations. ([#505](https://github.com/seejohnrun/ice_cube/pull/505)) by [@achmiral](https://github.com/achmiral)
 
+### Changed
+- Removed use of `delegate` method added in [66f1d797](https://github.com/ice-cube-ruby/ice_cube/commit/66f1d797092734563bfabd2132c024c7d087f683) , reverting to previous implementation. ([#522](https://github.com/ice-cube-ruby/ice_cube/pull/522))  by [@pacso](https://github.com/pacso)
+
 ### Fixed
 - Fix for weekly interval results when requesting `occurrences_between` on a narrow range ([#487](https://github.com/seejohnrun/ice_cube/pull/487)) by [@jakebrady5](https://github.com/jakebrady5)
+- When using a rule with hour_of_day validations, and asking for occurrences on the day that DST skips forward, valid occurrences would be missed. ([#464](https://github.com/seejohnrun/ice_cube/pull/464)) by [@jakebrady5](https://github.com/jakebrady5)
+- Include `exrules` when exporting a schedule to YAML, JSON or a Hash. ([#519](https://github.com/ice-cube-ruby/ice_cube/pull/519)) by [@pacso](https://github.com/pacso)
 
 ## [0.16.4] - 2021-10-21
 ### Added
diff --git a/README.md b/README.md
index 34c51ab0..db290578 100644
--- a/README.md
+++ b/README.md
@@ -91,17 +91,17 @@ schedule.previous_occurrence(from_time)
 schedule.previous_occurrences(4, from_time)
 
 # or include prior occurrences with a duration overlapping from_time
-schedule.next_occurrences(4, from_time, :spans => true)
-schedule.occurrences_between(from_time, to_time, :spans => true)
+schedule.next_occurrences(4, from_time, spans: true)
+schedule.occurrences_between(from_time, to_time, spans: true)
 
 # or give the schedule a duration and ask if occurring_at?
-schedule = IceCube::Schedule.new(now, :duration => 3600)
+schedule = IceCube::Schedule.new(now, duration: 3600)
 schedule.add_recurrence_rule IceCube::Rule.daily
 schedule.occurring_at?(now + 1800) # true
 schedule.occurring_between?(t1, t2)
 
 # using end_time also sets the duration
-schedule = IceCube::Schedule.new(start = Time.now, :end_time => start + 3600)
+schedule = IceCube::Schedule.new(start = Time.now, end_time: start + 3600)
 schedule.add_recurrence_rule IceCube::Rule.daily
 schedule.occurring_at?(start + 3599) # true
 schedule.occurring_at?(start + 3600) # false
@@ -162,7 +162,7 @@ ice_cube can provide ical or string representations of individual rules, or the
 whole schedule.
 
 ```ruby
-rule = IceCube::Rule.daily(2).day_of_week(:tuesday => [1, -1], :wednesday => [2])
+rule = IceCube::Rule.daily(2).day_of_week(tuesday: [1, -1], wednesday: [2])
 
 rule.to_ical # 'FREQ=DAILY;INTERVAL=2;BYDAY=1TU,-1TU,2WE'
 
@@ -218,12 +218,12 @@ month (e.g. no occurrences in February for `day_of_month(31)`).
 
 ```ruby
 # every month on the first and last tuesdays of the month
-schedule.add_recurrence_rule IceCube::Rule.monthly.day_of_week(:tuesday => [1, -1])
+schedule.add_recurrence_rule IceCube::Rule.monthly.day_of_week(tuesday: [1, -1])
 
 # every other month on the first monday and last tuesday
 schedule.add_recurrence_rule IceCube::Rule.monthly(2).day_of_week(
-  :monday => [1],
-  :tuesday => [-1]
+  monday: [1],
+  tuesday: [-1]
 )
 
 # for programmatic convenience (same as above)
@@ -270,7 +270,7 @@ schedule.add_recurrence_rule IceCube::Rule.hourly(2).day(:monday)
 schedule.add_recurrence_rule IceCube::Rule.minutely(10)
 
 # every hour and a half, on the last tuesday of the month
-schedule.add_recurrence_rule IceCube::Rule.minutely(90).day_of_week(:tuesday => [-1])
+schedule.add_recurrence_rule IceCube::Rule.minutely(90).day_of_week(tuesday: [-1])
 ```
 
 ### Secondly (every N seconds)
@@ -298,10 +298,7 @@ https://github.com/GetJobber/recurring_select
 
 ## Contributors
 
-* Andrew Vit ([@avit][github-avit])
-* Mat Brown - mat@patch.com
-* Philip Roberts
-* @sakrafd
+https://github.com/seejohnrun/ice_cube/graphs/contributors
 
 ---
 
diff --git a/ice_cube.gemspec b/ice_cube.gemspec
index d4c8f947..5191c6fa 100644
--- a/ice_cube.gemspec
+++ b/ice_cube.gemspec
@@ -8,9 +8,12 @@ Gem::Specification.new do |s|
   s.description = "ice_cube is a recurring date library for Ruby.  It allows for quick, programatic expansion of recurring date rules."
   s.author = "John Crepezzi"
   s.email = "john@crepezzi.com"
-  s.homepage = "http://seejohnrun.github.com/ice_cube/"
+  s.homepage = "https://seejohnrun.github.io/ice_cube/"
   s.license = "MIT"
 
+  s.metadata["changelog_uri"] = "https://github.com/seejohnrun/ice_cube/blob/master/CHANGELOG.md"
+  s.metadata["wiki_uri"] = "https://github.com/seejohnrun/ice_cube/wiki"
+
   s.version = IceCube::VERSION
   s.platform = Gem::Platform::RUBY
   s.files = Dir["lib/**/*.rb", "config/**/*.yml"]
diff --git a/lib/ice_cube/i18n.rb b/lib/ice_cube/i18n.rb
index aa879a4f..45a7f4a2 100644
--- a/lib/ice_cube/i18n.rb
+++ b/lib/ice_cube/i18n.rb
@@ -4,8 +4,12 @@ module IceCube
   module I18n
     LOCALES_PATH = File.expand_path(File.join("..", "..", "..", "config", "locales"), __FILE__)
 
-    class << self
-      delegate :t, :l, to: :backend
+    def self.t(*args, **kwargs)
+      backend.t(*args, **kwargs)
+    end
+
+    def self.l(*args, **kwargs)
+      backend.l(*args, **kwargs)
     end
 
     def self.backend
diff --git a/lib/ice_cube/parsers/hash_parser.rb b/lib/ice_cube/parsers/hash_parser.rb
index abe7f6a6..d0d6713b 100644
--- a/lib/ice_cube/parsers/hash_parser.rb
+++ b/lib/ice_cube/parsers/hash_parser.rb
@@ -60,7 +60,6 @@ def apply_rrules(schedule, data)
 
     def apply_exrules(schedule, data)
       return unless data[:exrules]
-      warn "IceCube: :exrules is deprecated, and will be removed in a future release. at: #{caller(1..1).first}"
       data[:exrules].each do |h|
         rrule = h.is_a?(IceCube::Rule) ? h : IceCube::Rule.from_hash(h)
 
diff --git a/lib/ice_cube/parsers/yaml_parser.rb b/lib/ice_cube/parsers/yaml_parser.rb
index 9810b797..2b979811 100644
--- a/lib/ice_cube/parsers/yaml_parser.rb
+++ b/lib/ice_cube/parsers/yaml_parser.rb
@@ -7,7 +7,7 @@ class YamlParser < HashParser
     attr_reader :hash
 
     def initialize(yaml)
-      @hash = YAML.load(yaml)
+      @hash = YAML.safe_load(yaml, permitted_classes: [Date, Symbol, Time], aliases: true)
       yaml.match SERIALIZED_START do |match|
         start_time = hash[:start_time] || hash[:start_date]
         TimeUtil.restore_deserialized_offset start_time, match[:tz]
diff --git a/lib/ice_cube/rule.rb b/lib/ice_cube/rule.rb
index 726ce17f..6652c3db 100644
--- a/lib/ice_cube/rule.rb
+++ b/lib/ice_cube/rule.rb
@@ -42,7 +42,7 @@ def to_yaml(*args)
 
     # From yaml
     def self.from_yaml(yaml)
-      from_hash YAML.load(yaml)
+      from_hash YAML.safe_load(yaml, permitted_classes: [Date, Symbol, Time])
     end
 
     def to_hash
diff --git a/lib/ice_cube/schedule.rb b/lib/ice_cube/schedule.rb
index 5fbb9530..68f01cc9 100644
--- a/lib/ice_cube/schedule.rb
+++ b/lib/ice_cube/schedule.rb
@@ -358,9 +358,7 @@ def to_hash
       data[:start_date] = data[:start_time] if IceCube.compatibility <= 11
       data[:end_time] = TimeUtil.serialize_time(end_time) if end_time
       data[:rrules] = recurrence_rules.map(&:to_hash)
-      if IceCube.compatibility <= 11 && exception_rules.any?
-        data[:exrules] = exception_rules.map(&:to_hash)
-      end
+      data[:exrules] = exception_rules.map(&:to_hash) if exception_rules.any?
       data[:rtimes] = recurrence_times.map do |rt|
         TimeUtil.serialize_time(rt)
       end
diff --git a/lib/ice_cube/validations/hour_of_day.rb b/lib/ice_cube/validations/hour_of_day.rb
index 64369e53..e0a9c3be 100644
--- a/lib/ice_cube/validations/hour_of_day.rb
+++ b/lib/ice_cube/validations/hour_of_day.rb
@@ -20,7 +20,7 @@ def realign(opening_time, start_time)
       freq = base_interval_validation.interval
 
       first_hour = Array(validations[:hour_of_day]).min_by(&:value)
-      time = TimeUtil::TimeWrapper.new(start_time, false)
+      time = TimeUtil::TimeWrapper.new(start_time, true)
       if freq > 1 && base_interval_validation.type == :hour
         offset = first_hour.validate(opening_time, start_time)
         time.add(:hour, offset - freq)
diff --git a/spec/examples/active_support_spec.rb b/spec/examples/active_support_spec.rb
index a07a9081..51973415 100644
--- a/spec/examples/active_support_spec.rb
+++ b/spec/examples/active_support_spec.rb
@@ -1,4 +1,5 @@
 require File.dirname(__FILE__) + "/../spec_helper"
+require "active_support"
 require "active_support/time"
 require "active_support/version"
 require "tzinfo" if ActiveSupport::VERSION::MAJOR == 3
@@ -45,10 +46,10 @@ module IceCube
     end
 
     it "can round trip TimeWithZone to YAML" do
-      schedule = Schedule.new(t0 = Time.zone.parse("2010-02-05 05:00:00"))
-      schedule.add_recurrence_time t0
-      schedule2 = Schedule.from_yaml(schedule.to_yaml)
-      expect(schedule.all_occurrences).to eq(schedule2.all_occurrences)
+      schedule1 = Schedule.new(t0 = Time.zone.parse("2010-02-05 05:00:00"))
+      schedule1.add_recurrence_time t0
+      schedule2 = Schedule.from_yaml(schedule1.to_yaml)
+      expect(schedule2.all_occurrences).to eq(schedule1.all_occurrences)
     end
 
     it "uses local zone from start time to determine occurs_on? from the beginning of day" do
diff --git a/spec/examples/daily_rule_spec.rb b/spec/examples/daily_rule_spec.rb
index 5a4b3f33..53887774 100644
--- a/spec/examples/daily_rule_spec.rb
+++ b/spec/examples/daily_rule_spec.rb
@@ -56,6 +56,15 @@ module IceCube
           Time.local(2013, 3, 11, 2, 0, 0) # -0700
         ])
       end
+
+      it "should not skip days where DST changes" do
+        start_time = Time.local(2013, 3, 10, 0, 0, 0)
+        schedule = Schedule.new(start_time)
+        schedule.add_recurrence_rule Rule.daily.hour_of_day(19)
+        expect(schedule.occurrences_between(start_time, start_time + ONE_DAY)).to eq([
+          Time.local(2013, 3, 10, 19, 0, 0)
+        ])
+      end
     end
 
     it "should update previous interval" do
diff --git a/spec/examples/serialization_spec.rb b/spec/examples/serialization_spec.rb
index 7886a04a..5583c23b 100644
--- a/spec/examples/serialization_spec.rb
+++ b/spec/examples/serialization_spec.rb
@@ -15,7 +15,7 @@
       let(:start_time) { Time.now.in_time_zone("America/Vancouver") }
 
       it "serializes time as a Hash" do
-        hash = YAML.load(yaml)
+        hash = YAML.safe_load(yaml, permitted_classes: [Symbol, Time])
         expect(hash[:start_time][:time]).to eq start_time.utc
         expect(hash[:start_time][:zone]).to eq "America/Vancouver"
       end
diff --git a/spec/examples/to_ical_spec.rb b/spec/examples/to_ical_spec.rb
index 7ee59236..39dd5209 100644
--- a/spec/examples/to_ical_spec.rb
+++ b/spec/examples/to_ical_spec.rb
@@ -1,4 +1,5 @@
 require File.dirname(__FILE__) + "/../spec_helper"
+require "active_support"
 require "active_support/time"
 
 describe IceCube, "to_ical" do
diff --git a/spec/examples/to_yaml_spec.rb b/spec/examples/to_yaml_spec.rb
index 7842621c..e7c62c59 100644
--- a/spec/examples/to_yaml_spec.rb
+++ b/spec/examples/to_yaml_spec.rb
@@ -78,14 +78,15 @@ module IceCube
     end
 
     it "should be able to make a round-trip to YAML with .day_of_year" do
-      schedule = Schedule.new(Time.now)
-      schedule.add_recurrence_rule Rule.yearly.day_of_year(100, 200)
+      schedule1 = Schedule.new(Time.now)
+      schedule1.add_recurrence_rule Rule.yearly.day_of_year(100, 200)
 
-      yaml_string = schedule.to_yaml
+      yaml_string = schedule1.to_yaml
       schedule2 = Schedule.from_yaml(yaml_string)
 
       # compare without usecs
-      expect(schedule.first(10).map { |r| r.to_s }).to eq(schedule2.first(10).map { |r| r.to_s })
+      expect(schedule2.first(10).map { |r| r.to_s })
+        .to eq(schedule1.first(10).map { |r| r.to_s })
     end
 
     it "should be able to make a round-trip to YAML with .hour_of_day" do
@@ -132,6 +133,18 @@ module IceCube
       expect(schedule.first(10).map { |r| r.to_s }).to eq(schedule2.first(10).map { |r| r.to_s })
     end
 
+    it "should be able to make a round-trip to YAML whilst preserving exception rules" do
+      original_schedule = Schedule.new(Time.now)
+      original_schedule.add_recurrence_rule Rule.daily.day(:monday, :wednesday)
+      original_schedule.add_exception_rule Rule.daily.day(:wednesday)
+
+      yaml_string = original_schedule.to_yaml
+      returned_schedule = Schedule.from_yaml(yaml_string)
+
+      # compare without usecs
+      expect(returned_schedule.first(10).map { |r| r.to_s }).to eq(original_schedule.first(10).map { |r| r.to_s })
+    end
+
     it "should have a to_yaml representation of a rule that does not contain ruby objects" do
       rule = Rule.daily.day_of_week(monday: [1, -1]).month_of_year(:april)
       expect(rule.to_yaml.include?("object")).to be_falsey
@@ -172,7 +185,7 @@ module IceCube
       schedule2 = Schedule.from_yaml(schedule1.to_yaml) # round trip
 
       end_time = Time.now + ONE_DAY
-      expect(schedule1.occurrences(end_time)).to eq(schedule2.occurrences(end_time))
+      expect(schedule2.occurrences(end_time)).to eq(schedule1.occurrences(end_time))
     end
 
     it "should be able to make a round trip with an exception time" do
@@ -311,7 +324,8 @@ module IceCube
 
       symbol_yaml = Schedule.from_hash(symbol_data).to_yaml
       string_yaml = Schedule.from_hash(string_data).to_yaml
-      expect(YAML.load(symbol_yaml)).to eq(YAML.load(string_yaml))
+      expect(YAML.safe_load(symbol_yaml, permitted_classes: [Symbol, Time]))
+        .to eq(YAML.safe_load(string_yaml, permitted_classes: [Symbol, Time]))
     end
 
     it "should raise an ArgumentError when trying to deserialize an invalid rule type" do