diff --git a/pub/lib/dependabot/pub/requirement.rb b/pub/lib/dependabot/pub/requirement.rb
index 7da062ab1e3..0c6c3d7cabf 100644
--- a/pub/lib/dependabot/pub/requirement.rb
+++ b/pub/lib/dependabot/pub/requirement.rb
@@ -14,7 +14,7 @@ class Requirement < Gem::Requirement
       quoted = OPS.keys.map { |k| Regexp.quote(k) }.join("|")
       version_pattern = Pub::Version::VERSION_PATTERN
 
-      PATTERN_RAW = "\\s*(#{quoted})?\\s*(#{version_pattern})\\s*".freeze
+      PATTERN_RAW = "\\s*(#{quoted})?\\s*(#{version_pattern})\\s*"
       PATTERN = /\A#{PATTERN_RAW}\z/
 
       # Use Pub::Version rather than Gem::Version to ensure that