diff --git a/lib/devise/models/rememberable.rb b/lib/devise/models/rememberable.rb
index a66979ad59..e20d8dd03e 100644
--- a/lib/devise/models/rememberable.rb
+++ b/lib/devise/models/rememberable.rb
@@ -101,9 +101,13 @@ def after_remembered
       end
 
       def remember_me?(token, generated_at)
-        # TODO: Normalize the JSON type coercion along with the Timeoutable hook
-        # in a single place https://github.com/heartcombo/devise/blob/ffe9d6d406e79108cf32a2c6a1d0b3828849c40b/lib/devise/hooks/timeoutable.rb#L14-L18
-        if generated_at.is_a?(String)
+        # Normalize cookie/session JSON type coercion the same way Timeoutable
+        # does for last_request_at (Integer from to_i, Float/numeric strings
+        # from to_f / to_json).
+        case generated_at
+        when Integer, Float
+          generated_at = Time.at(generated_at).utc
+        when String
           generated_at = time_from_json(generated_at)
         end
 
@@ -122,7 +126,7 @@ def remember_me?(token, generated_at)
       private
 
       def time_from_json(value)
-        if value =~ /\A\d+\.\d+\Z/
+        if value =~ /\A\d+(?:\.\d+)?\Z/
           Time.at(value.to_f)
         else
           Time.parse(value) rescue nil
diff --git a/test/models/rememberable_test.rb b/test/models/rememberable_test.rb
index 8b83172120..a1cc9fd45a 100644
--- a/test/models/rememberable_test.rb
+++ b/test/models/rememberable_test.rb
@@ -66,6 +66,23 @@ def create_resource
     assert_equal user, User.serialize_from_cookie(user.to_key, user.authenticatable_salt, Time.now.utc.to_f.to_json)
   end
 
+  test 'serialize from cookie should accept Integer and Float timestamps from JSON coercion' do
+    user = create_user
+    user.remember_me!
+    assert_equal user, User.serialize_from_cookie(user.to_key, user.authenticatable_salt, Time.now.utc.to_f)
+
+    # Integer seconds truncate subseconds, so keep remember_created_at clearly earlier.
+    user.update_attribute(:remember_created_at, 1.minute.ago)
+    assert_equal user, User.serialize_from_cookie(user.to_key, user.authenticatable_salt, Time.now.utc.to_i)
+  end
+
+  test 'serialize from cookie should accept an Integer-only numeric String timestamp' do
+    user = create_user
+    user.remember_me!
+    user.update_attribute(:remember_created_at, 1.minute.ago)
+    assert_equal user, User.serialize_from_cookie(user.to_key, user.authenticatable_salt, Time.now.utc.to_i.to_s)
+  end
+
   test 'serialize from cookie should return nil with invalid datetime' do
     user = create_user
     user.remember_me!