diff --git a/Gemfile.lock b/Gemfile.lock
index aaa8385..dd0b904 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -4,7 +4,7 @@ PATH
     ofx (0.3.8)
       erb (~> 4.0.4)
       nokogiri (>= 1.13.1, < 1.19.2)
-      stringio (~> 3.1.7)
+      stringio (>= 3.1.7, < 3.3.0)
 
 GEM
   remote: https://rubygems.org/
@@ -33,7 +33,7 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.13.0)
     rspec-support (3.13.4)
-    stringio (3.1.9)
+    stringio (3.2.0)
 
 PLATFORMS
   arm64-darwin-24
diff --git a/ofx.gemspec b/ofx.gemspec
index 2471666..c908058 100644
--- a/ofx.gemspec
+++ b/ofx.gemspec
@@ -29,5 +29,5 @@ Gem::Specification.new do |s|
   s.add_development_dependency 'rake', '~> 13.0.6'
   s.add_development_dependency 'rspec', '~> 3.10'
   s.add_dependency 'erb', '~> 4.0.4'
-  s.add_dependency 'stringio', '~> 3.1.7'
+  s.add_dependency 'stringio', '>= 3.1.7', '< 3.3.0'
 end