diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 456d865..5ec8526 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -6,7 +6,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        ruby: ['3.0', '3.1', '3.2']
+        ruby: ['3.0', '3.1', '3.2', '3.3']
     name: test (Ruby ${{ matrix.ruby }} on ${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     steps:
diff --git a/.ruby-version b/.ruby-version
index a3ec5a4..eb39e53 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.2
+3.3
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47510cc..af49432 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## Main
 
-Nothing so far
+#### Changes
+* Add support for Ruby 3.3
 
 ## 1.1.4
 
diff --git a/lib/notam/schedule.rb b/lib/notam/schedule.rb
index 84143f6..a4d95fb 100644
--- a/lib/notam/schedule.rb
+++ b/lib/notam/schedule.rb
@@ -100,7 +100,7 @@ def parse_datetimes
           actives = send("#{active_unit}_from", raw_active_unit.strip)
           times = times_from(raw_times.strip)
           inactives = send("#{inactive_unit}_from", @exceptions)
-          if times.any? &method(:across_midnight?)
+          if times.any?(&method(:across_midnight?))
             times.each_with_object([]) do |time, array|
               if across_midnight? time
                 array << new(actives, [(time.first..AIXM::END_OF_DAY)], inactives, base_date: @base_date)
diff --git a/notam.gemspec b/notam.gemspec
index 02e6ad0..a2eef7d 100644
--- a/notam.gemspec
+++ b/notam.gemspec
@@ -40,6 +40,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = '>= 3.0.0'
 
   spec.add_runtime_dependency 'aixm', '~> 1', '>= 1.3.2'
+  spec.add_runtime_dependency 'bigdecimal', '~> 3'
   spec.add_runtime_dependency 'i18n', '~> 1'
 
   spec.add_development_dependency 'rake'