diff --git a/shard.lock b/shard.lock
index 0be434a..f0ad87c 100644
--- a/shard.lock
+++ b/shard.lock
@@ -5,7 +5,7 @@ shards:
     version: 0.10.0
 
   callback:
-    github: mosop/callback
+    github: drujensen/callback
     version: 0.6.3
 
   cli:
diff --git a/shard.yml b/shard.yml
index 28d498e..570a6bc 100644
--- a/shard.yml
+++ b/shard.yml
@@ -8,6 +8,12 @@ description: |
   Simple CLI to ask the internet if it's worth watching this movie.
 
 dependencies:
+  # FIXME: Fixes the breaking change introduced by 0.30.0:
+  #   Error: abstract `def Enumerable(T)#each(&block)` must be implemented by Callback::ResultSet(T)
+  # Use the fork until https://github.com/mosop/callback/pull/3 has been merged
+  # and optarg has been updated to that version.
+  callback:
+    github: drujensen/callback
   myhtml:
     github: kostya/myhtml
   crest: