diff --git a/gems/activerecord/6.0/manifest.yaml b/gems/activerecord/6.0/manifest.yaml
new file mode 100644
index 00000000..d510ebfc
--- /dev/null
+++ b/gems/activerecord/6.0/manifest.yaml
@@ -0,0 +1,2 @@
+dependencies:
+  - name: delegate
diff --git a/gems/activerecord/6.0/patch.rbs b/gems/activerecord/6.0/patch.rbs
index e6cadd70..9e21044d 100644
--- a/gems/activerecord/6.0/patch.rbs
+++ b/gems/activerecord/6.0/patch.rbs
@@ -27,15 +27,3 @@ module PG
     def async_exec: (*untyped) -> untyped
   end
 end
-
-# Remove the fake SimpleDelegator type
-# if the real types are available.
-class SimpleDelegator
-end
-
-# Remove the fake types for Gem::Version
-# if the real types are available.
-module Gem
-  class Version
-  end
-end
diff --git a/gems/activerecord/6.1/manifest.yaml b/gems/activerecord/6.1/manifest.yaml
new file mode 100644
index 00000000..d510ebfc
--- /dev/null
+++ b/gems/activerecord/6.1/manifest.yaml
@@ -0,0 +1,2 @@
+dependencies:
+  - name: delegate
diff --git a/gems/activerecord/7.0/manifest.yaml b/gems/activerecord/7.0/manifest.yaml
index 5c92b56a..9f4885bd 100644
--- a/gems/activerecord/7.0/manifest.yaml
+++ b/gems/activerecord/7.0/manifest.yaml
@@ -5,6 +5,7 @@
 #
 dependencies:
   - name: date
+  - name: delegate
   - name: logger
   - name: monitor
   - name: mutex_m
diff --git a/gems/activerecord/7.1/manifest.yaml b/gems/activerecord/7.1/manifest.yaml
index 5c92b56a..9f4885bd 100644
--- a/gems/activerecord/7.1/manifest.yaml
+++ b/gems/activerecord/7.1/manifest.yaml
@@ -5,6 +5,7 @@
 #
 dependencies:
   - name: date
+  - name: delegate
   - name: logger
   - name: monitor
   - name: mutex_m
diff --git a/gems/activerecord/7.2/manifest.yaml b/gems/activerecord/7.2/manifest.yaml
index 5c92b56a..9f4885bd 100644
--- a/gems/activerecord/7.2/manifest.yaml
+++ b/gems/activerecord/7.2/manifest.yaml
@@ -5,6 +5,7 @@
 #
 dependencies:
   - name: date
+  - name: delegate
   - name: logger
   - name: monitor
   - name: mutex_m