diff --git a/Gemfile.lock b/Gemfile.lock
index 52626f374c..94d51778c5 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -83,6 +83,7 @@ PATH
       marcel (~> 1.0)
     activesupport (7.1.0.alpha)
       base64
+      bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
       connection_pool (>= 2.2.5)
       drb
@@ -155,6 +156,7 @@ GEM
     bcrypt (3.1.18)
     beaneater (1.1.3)
     benchmark-ips (2.10.0)
+    bigdecimal (3.1.4)
     bindex (0.8.1)
     bootsnap (1.15.0)
       msgpack (~> 1.2)
diff --git a/activesupport/activesupport.gemspec b/activesupport/activesupport.gemspec
index 74301b9578..7911e3890e 100644
--- a/activesupport/activesupport.gemspec
+++ b/activesupport/activesupport.gemspec
@@ -42,4 +42,5 @@
   s.add_dependency "base64"
   s.add_dependency "drb"
   s.add_dependency "mutex_m"
+  s.add_dependency "bigdecimal"
 end