diff --git a/activesupport/lib/active_support/testing/strict_warnings.rb b/activesupport/lib/active_support/testing/strict_warnings.rb
index 946618a90ee11..9abbfbc3a69e2 100644
--- a/activesupport/lib/active_support/testing/strict_warnings.rb
+++ b/activesupport/lib/active_support/testing/strict_warnings.rb
@@ -14,6 +14,9 @@ class WarningError < StandardError; end
       # Expected non-verbose warning emitted by Rails.
       /Ignoring .*\.yml because it has expired/,
       /Failed to validate the schema cache because/,
+
+      # TODO: Can be removed if https://github.com/ruby/uri/issues/118 is addressed
+      /URI::RFC3986_PARSER/,
     )
 
     SUPPRESSED_WARNINGS = Regexp.union(