diff --git a/.licenses/bundler/reverse_markdown.dep.yml b/.licenses/bundler/reverse_markdown.dep.yml
index 93b3211..4d9f1e7 100644
--- a/.licenses/bundler/reverse_markdown.dep.yml
+++ b/.licenses/bundler/reverse_markdown.dep.yml
@@ -1,6 +1,6 @@
 ---
 name: reverse_markdown
-version: 2.1.1
+version: 3.0.0
 type: bundler
 summary: Convert html code into markdown.
 homepage: http://github.com/xijo/reverse_markdown
diff --git a/Gemfile.lock b/Gemfile.lock
index de58668..79a81bf 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -6,7 +6,7 @@ PATH
       licensee (~> 9.16)
       parallel (~> 1.22)
       pathname-common_prefix (~> 0.0.1)
-      reverse_markdown (~> 2.1)
+      reverse_markdown (>= 2.1, < 4.0)
       ruby-xxHash (~> 0.4.0)
       thor (~> 1.2)
       tomlrb (~> 2.0)
@@ -75,7 +75,7 @@ GEM
     rainbow (3.1.1)
     rake (13.2.1)
     regexp_parser (2.6.2)
-    reverse_markdown (2.1.1)
+    reverse_markdown (3.0.0)
       nokogiri
     rexml (3.3.9)
     rubocop (1.45.1)
diff --git a/licensed.gemspec b/licensed.gemspec
index 86c62bd..c7ed2b5 100644
--- a/licensed.gemspec
+++ b/licensed.gemspec
@@ -29,7 +29,7 @@ Gem::Specification.new do |spec|
   spec.add_dependency "tomlrb", "~> 2.0"
   spec.add_dependency "ruby-xxHash", "~> 0.4.0"
   spec.add_dependency "parallel", "~> 1.22"
-  spec.add_dependency "reverse_markdown", "~> 2.1"
+  spec.add_dependency "reverse_markdown", ">= 2.1", "< 4.0"
   spec.add_dependency "json", "~> 2.6"
 
   spec.add_development_dependency "rake", "~> 13.0"