diff --git a/jekyll-gist.gemspec b/jekyll-gist.gemspec
index ba7a55e..44f93bf 100644
--- a/jekyll-gist.gemspec
+++ b/jekyll-gist.gemspec
@@ -18,7 +18,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = ">= 2.3.0"
 
   spec.add_runtime_dependency "jekyll", ">= 3.7", "< 5.0"
-  spec.add_runtime_dependency "octokit", "~> 4.2"
+  spec.add_runtime_dependency "octokit", "~> 8.0"
 
   spec.add_development_dependency "bundler"
   spec.add_development_dependency "rake"
diff --git a/lib/jekyll-gist/gist_tag.rb b/lib/jekyll-gist/gist_tag.rb
index ae8ae34..22c3e24 100644
--- a/lib/jekyll-gist/gist_tag.rb
+++ b/lib/jekyll-gist/gist_tag.rb
@@ -19,6 +19,7 @@ def render(context)
         @settings = context.registers[:site].config["gist"]
         if (tag_contents = determine_arguments(@markup.strip))
           gist_id  = tag_contents[0]
+          gist_id.delete!(":")
           filename = tag_contents[1]
           gist_id  = context[gist_id]  if context.key?(gist_id)
           filename = context[filename] if context.key?(filename)