diff --git a/Gemfile.lock b/Gemfile.lock
index 60c127fca97..5d725185d92 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -74,7 +74,7 @@ PATH
       activejob (= 7.0.0.alpha)
       activerecord (= 7.0.0.alpha)
       activesupport (= 7.0.0.alpha)
-      marcel (~> 0.3.1)
+      marcel (~> 1.0.0)
       mini_mime (~> 1.0.2)
     activesupport (7.0.0.alpha)
       concurrent-ruby (~> 1.0, >= 1.0.2)
@@ -315,11 +315,9 @@ GEM
       nokogiri (>= 1.5.9)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
-    marcel (0.3.3)
-      mimemagic (~> 0.3.2)
+    marcel (1.0.0)
     memoist (0.16.2)
     method_source (1.0.0)
-    mimemagic (0.3.5)
     mini_magick (4.11.0)
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
diff --git a/activestorage/activestorage.gemspec b/activestorage/activestorage.gemspec
index 28a55b9ba64..9133bb87096 100644
--- a/activestorage/activestorage.gemspec
+++ b/activestorage/activestorage.gemspec
@@ -36,6 +36,6 @@ Gem::Specification.new do |s|
   s.add_dependency "activejob",     version
   s.add_dependency "activerecord",  version
 
-  s.add_dependency "marcel",    "~> 0.3.1"
+  s.add_dependency "marcel",    "~> 1.0.0"
   s.add_dependency "mini_mime", "~> 1.0.2"
 end