diff --git a/Gemfile.lock b/Gemfile.lock
index 17e4506a4..16d9220d4 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,3 +1,10 @@
+GIT
+  remote: https://github.com/alexandergitter/marcel.git
+  revision: d48a1180001987c425e45d288f3dc2edbc85c5be
+  branch: fix-av1-webm
+  specs:
+    marcel (1.0.4)
+
 GIT
   remote: https://github.com/e621ng/dtext_rb.git
   revision: 5ef8fd7a5205c832f4c18197911717e7d491494e
@@ -186,7 +193,6 @@ GEM
       net-smtp
     mailgun-ruby (1.2.14)
       rest-client (>= 2.0.2)
-    marcel (1.0.4)
     mime-types (3.5.2)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2024.0305)
@@ -400,7 +406,7 @@ DEPENDENCIES
   faraday-retry
   listen
   mailgun-ruby
-  marcel
+  marcel!
   mocha
   opensearch-ruby
   pg