diff --git a/actionview/lib/action_view/digestor.rb b/actionview/lib/action_view/digestor.rb
index b91e61da18..bc42b5dae1 100644
--- a/actionview/lib/action_view/digestor.rb
+++ b/actionview/lib/action_view/digestor.rb
@@ -15,7 +15,7 @@ module ActionView
       # * <tt>partial</tt>  - Specifies whether the template is a partial
       def digest(name:, finder:, dependencies: [])
         dependencies ||= []
-        cache_key = ([ name ].compact + dependencies).join('.')
+        cache_key = [ name, finder.rendered_format, dependencies ].flatten.compact.join('.')
 
         # this is a correctly done double-checked locking idiom
         # (Concurrent::Map's lookups have volatile semantics)
@@ -39,8 +39,11 @@ module ActionView
       def tree(name, finder, partial = false, seen = {})
         logical_name = name.gsub(%r|/_|, "/")
 
-        if finder.disable_cache { finder.exists?(logical_name, [], partial) }
-          template = finder.disable_cache { finder.find(logical_name, [], partial) }
+        format = finder.rendered_format
+        formats = finder.formats.without(format).unshift(format)
+
+        if finder.disable_cache { finder.exists?(logical_name, [], partial, [], formats: formats) }
+          template = finder.disable_cache { finder.find(logical_name, [], partial, [], formats: formats) }
 
           if node = seen[template.identifier] # handle cycles in the tree
             node
diff --git a/actionview/test/fixtures/digestor/comments/_comment.json.erb b/actionview/test/fixtures/digestor/comments/_comment.json.erb
new file mode 100644
index 0000000000..696eb13917
--- /dev/null
+++ b/actionview/test/fixtures/digestor/comments/_comment.json.erb
@@ -0,0 +1 @@
+{"content": "Great story!"}
diff --git a/actionview/test/template/digestor_test.rb b/actionview/test/template/digestor_test.rb
index 4750d2a5a3..3dad70f464 100644
--- a/actionview/test/template/digestor_test.rb
+++ b/actionview/test/template/digestor_test.rb
@@ -18,6 +18,7 @@ class FixtureFinder < ActionView::LookupContext
 
   def initialize(details = {})
     super(ActionView::PathSet.new(['digestor']), details, [])
+    @rendered_format = :html
   end
 end
 
@@ -280,6 +281,12 @@ class TemplateDigestorTest < ActionView::TestCase
     end
   end
 
+  def test_different_formats
+    html_digest = digest("comments/_comment", format: :html)
+    json_digest = digest("comments/_comment", format: :json)
+
+    assert_not_equal html_digest, json_digest
+  end
 
   private
     def assert_logged(message)
@@ -309,8 +316,11 @@ class TemplateDigestorTest < ActionView::TestCase
 
     def digest(template_name, options = {})
       options = options.dup
+      finder_options = options.extract!(:variants, :format)
+
+      finder.variants = finder_options[:variants] || []
+      finder.rendered_format = finder_options[:format] if finder_options[:format]
 
-      finder.variants = options.delete(:variants) || []
       ActionView::Digestor.digest(name: template_name, finder: finder, dependencies: (options[:dependencies] || []))
     end