diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8ab6327..17a8267 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -10,7 +10,7 @@ jobs:
     name: Ruby ${{ matrix.ruby }}
     strategy:
       matrix:
-        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2"]
+        ruby: ["2.6", "2.7", "3.0", "3.1", "3.2", "3.3"]
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1
diff --git a/test/test_reporter.rb b/test/test_reporter.rb
index 127d4af..f7a1827 100644
--- a/test/test_reporter.rb
+++ b/test/test_reporter.rb
@@ -240,10 +240,14 @@ def test_no_strings_retained_report
       # 3 times "0", 2 times for short interpolated strings, 3 times for long interpolated strings
       total_allocated = 5 * (3 + 2 + 3 + 3)
       unique = 20
-    else
+    elsif RUBY_VERSION < '3.3'
       # 2 times for short interpolated strings, 3 times for long interpolated strings
       total_allocated = 5 * (2 + 3 + 3)
       unique = 15
+    else
+      # 2 times for short interpolated strings, 2 times for long interpolated strings
+      total_allocated = 5 * (2 + 2 + 2)
+      unique = 15
     end
 
     assert_equal(total_allocated, results.total_allocated, "#{total_allocated} strings should be allocated")