diff --git a/README.adoc b/README.adoc
index 99d4f91..047b54a 100644
--- a/README.adoc
+++ b/README.adoc
@@ -61,11 +61,11 @@ Follow the {uri-rvm-install}[installation instructions] on the RVM site to setup
 Once you have RVM setup, switch to the version of Ruby you installed:
 
 [subs=attributes+]
- $ rvm use 2.3.0
+ $ rvm use 2.7
 
 If you want RVM to set the version of Ruby automatically whenever you switch to the project, write the version of Ruby to a file at the root of the project named [path]_.ruby-version_:
 
- $ echo 2.3.0 > .ruby-version
+ $ echo 2.7 > .ruby-version
 
 We like RVM because it keeps the dependencies required by various projects isolated from each other and from your system.
 
diff --git a/docbookrx.gemspec b/docbookrx.gemspec
index 645097e..d1cbb55 100644
--- a/docbookrx.gemspec
+++ b/docbookrx.gemspec
@@ -24,7 +24,7 @@ Gem::Specification.new do |s|
   s.extra_rdoc_files = Dir['README.adoc', 'LICENSE']
   s.require_paths = ['lib']
 
-  s.add_runtime_dependency 'nokogiri', '~> 1.10.0'
+  s.add_runtime_dependency 'nokogiri', '~> 1.15.0'
   s.add_development_dependency 'rake', '~> 13.0.0'
   s.add_development_dependency 'rspec', '~> 3.9.0'
 end