diff --git a/duo_api.gemspec b/duo_api.gemspec
index 71d9365..22bd07b 100644
--- a/duo_api.gemspec
+++ b/duo_api.gemspec
@@ -2,7 +2,7 @@
 
 Gem::Specification.new do |s|
   s.name        = 'duo_api'
-  s.version     = '1.5.0'
+  s.version     = '1.5.1'
   s.summary     = 'Duo API Ruby'
   s.description = 'A Ruby implementation of the Duo API.'
   s.email       = 'support@duo.com'
@@ -20,7 +20,7 @@ Gem::Specification.new do |s|
     'lib/duo_api/device.rb'
   ]
   s.required_ruby_version = '>= 2.5'
-  s.add_dependency 'base64', '~> 0.2.0'
+  s.add_dependency 'base64', '>= 0.2.0'
   s.add_development_dependency 'mocha', '~> 2.7.1'
   s.add_development_dependency 'ostruct', '~> 0.6.1'
   s.add_development_dependency 'rake', '~> 13.2.1'