diff --git a/spec/definitions/rails5/activejob.yml b/spec/definitions/rails5/activejob.yml
index 03078e4..0306ad9 100644
--- a/spec/definitions/rails5/activejob.yml
+++ b/spec/definitions/rails5/activejob.yml
@@ -131,7 +131,7 @@ ActiveJob::Base.deprecate:
 ActiveJob::Base.descendants:
   types:
   - undefined
-  skip: false
+  skip: true
 ActiveJob::Base.deserialize:
   types:
   - undefined
diff --git a/spec/definitions/rails5/core/Array.yml b/spec/definitions/rails5/core/Array.yml
index 561e44c..0b8804b 100644
--- a/spec/definitions/rails5/core/Array.yml
+++ b/spec/definitions/rails5/core/Array.yml
@@ -83,7 +83,7 @@ Array.deprecate:
 Array.descendants:
   types:
   - undefined
-  skip: false
+  skip: true
 Array.duplicable?:
   types:
   - undefined
diff --git a/spec/definitions/rails5/core/Class.yml b/spec/definitions/rails5/core/Class.yml
index ecba79b..1b4b22b 100644
--- a/spec/definitions/rails5/core/Class.yml
+++ b/spec/definitions/rails5/core/Class.yml
@@ -91,7 +91,7 @@ Class.deprecate:
 Class.descendants:
   types:
   - undefined
-  skip: false
+  skip: true
 Class.duplicable?:
   types:
   - undefined
@@ -313,7 +313,7 @@ Class#deprecate:
 Class#descendants:
   types:
   - undefined
-  skip: false
+  skip: true
 Class#duplicable?:
   types:
   - undefined
diff --git a/spec/definitions/rails5/core/Date.yml b/spec/definitions/rails5/core/Date.yml
index d04e2ca..a1b2cc2 100644
--- a/spec/definitions/rails5/core/Date.yml
+++ b/spec/definitions/rails5/core/Date.yml
@@ -103,7 +103,7 @@ Date.deprecate:
 Date.descendants:
   types:
   - undefined
-  skip: false
+  skip: true
 Date.duplicable?:
   types:
   - undefined
diff --git a/spec/definitions/rails5/core/DateTime.yml b/spec/definitions/rails5/core/DateTime.yml
index a16817a..f2ff43c 100644
--- a/spec/definitions/rails5/core/DateTime.yml
+++ b/spec/definitions/rails5/core/DateTime.yml
@@ -107,7 +107,7 @@ DateTime.deprecate:
 DateTime.descendants:
   types:
   - undefined
-  skip: false
+  skip: true
 DateTime.duplicable?:
   types:
   - undefined