1 files changed, 4 insertions, 2 deletions
diff --git a/Gemfile b/Gemfile
index ea42769..3f76764 100644
--- a/Gemfile
+++ b/Gemfile
@@ -10,8 +10,10 @@ unless ENV.fetch('ASCIIDOCTOR_VERSION', '').empty?
 end
 
 group :development do
-  # Keep in sync with version used for asciidoctor.js.
-  gem 'opal', '~> 0.11.0'
+  # Keep in sync with version used in opal-node-runtime <- asciidoctor.js.
+  # TODO: Maybe replace with JS version after
+  #   https://github.com/Mogztter/opal-node-compiler/issues/6 is resolved.
+  gem 'opal', github: 'opal/opal', ref: 'd136ea8'
 end
 
 group :ci do