diff --git a/transferwise.gemspec b/transferwise.gemspec
index 5a6040e..f6d9b95 100644
--- a/transferwise.gemspec
+++ b/transferwise.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_runtime_dependency "activesupport", ">= 3.0.0", "< 7"
+  spec.add_runtime_dependency "activesupport", ">= 3.0.0", "< 7.1"
   spec.add_runtime_dependency "oauth2", ">= 1.4.0", "< 2.0"
   spec.add_runtime_dependency "rest-client", ">= 1.4", "< 4.0"
   spec.add_development_dependency "bundler", "~> 2.2"