diff --git a/app/models/feed.rb b/app/models/feed.rb
index 5bce88f25522df..492ddc652a4980 100644
--- a/app/models/feed.rb
+++ b/app/models/feed.rb
@@ -13,6 +13,12 @@ def get(limit, max_id = nil, since_id = nil, min_id = nil)
   protected
 
   def from_redis(limit, max_id, since_id, min_id)
+    # 1ヶ月以上前へ遡ろうとする行為を全面的に禁止
+    oldest_id = 1.month.ago.to_i * 1000  << 16
+    max_id = [max_id.to_i, oldest_id].min if max_id.present?
+    since_id = [since_id.to_i, oldest_id].max if since_id.present?
+    min_id = [min_id.to_i, oldest_id].max if min_id.present?
+
     if min_id.blank?
       max_id     = '+inf' if max_id.blank?
       since_id   = '-inf' if since_id.blank?
diff --git a/app/models/home_feed.rb b/app/models/home_feed.rb
index ba7564983b0f8b..deef3006be5ed9 100644
--- a/app/models/home_feed.rb
+++ b/app/models/home_feed.rb
@@ -18,6 +18,12 @@ def get(limit, max_id = nil, since_id = nil, min_id = nil)
   private
 
   def from_database(limit, max_id, since_id, min_id)
+    # 1ヶ月以上前へ遡ろうとする行為を全面的に禁止
+    oldest_id = 1.month.ago.to_i * 1000  << 16
+    max_id = [max_id.to_i, oldest_id].min if max_id.present?
+    since_id = [since_id.to_i, oldest_id].max if since_id.present?
+    min_id = [min_id.to_i, oldest_id].max if min_id.present?
+
     Status.as_home_timeline(@account)
           .paginate_by_id(limit, max_id: max_id, since_id: since_id, min_id: min_id)
           .reject { |status| FeedManager.instance.filter?(:home, status, @account.id) }