diff --git a/Gemfile.lock b/Gemfile.lock
index 7287fdf..9553863 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,7 +2,7 @@ PATH
   remote: .
   specs:
     monopay-ruby (1.1.0)
-      base64 (~> 0.1.1)
+      base64 (>= 0.1, < 1.0)
       bigdecimal (~> 3.1.9)
       json (~> 2.5)
       money (~> 6.13)
@@ -67,6 +67,7 @@ GEM
 PLATFORMS
   arm64-darwin-21
   arm64-darwin-23
+  arm64-darwin-25
   x86_64-linux
 
 DEPENDENCIES
diff --git a/monopay-ruby.gemspec b/monopay-ruby.gemspec
index 8407890..e665909 100644
--- a/monopay-ruby.gemspec
+++ b/monopay-ruby.gemspec
@@ -35,7 +35,7 @@ Gem::Specification.new do |spec|
   # Uncomment to register a new dependency of your gem
   # TODO: Use metal versions of gems where possible to avoid unnecessary extra
   spec.add_dependency "rest-client", "~> 2.1"
-  spec.add_dependency "base64", "~> 0.1.1"
+  spec.add_dependency "base64", ">= 0.1", "< 1.0"
   spec.add_dependency "json", "~> 2.5"
   # spec.add_dependency "openssl", "~> 2.1"
   spec.add_dependency "money", "~> 6.13"