diff --git a/lib/identity_cache/cache_fetcher.rb b/lib/identity_cache/cache_fetcher.rb
index e7f5c71f..3573a628 100644
--- a/lib/identity_cache/cache_fetcher.rb
+++ b/lib/identity_cache/cache_fetcher.rb
@@ -87,10 +87,6 @@ def fetch(key, fill_lock_duration: nil, lock_wait_tries: 2, &block)
       end
     end
 
-    def exist?(key)
-      @cache_backend.exist?(key)
-    end
-
     private
 
     def fetch_without_fill_lock(key)
diff --git a/lib/identity_cache/memoized_cache_proxy.rb b/lib/identity_cache/memoized_cache_proxy.rb
index da4a954c..d967a149 100644
--- a/lib/identity_cache/memoized_cache_proxy.rb
+++ b/lib/identity_cache/memoized_cache_proxy.rb
@@ -147,10 +147,6 @@ def clear
       end
     end
 
-    def exist?(key)
-      @cache_fetcher.exist?(key)
-    end
-
     private
 
     EMPTY_ARRAY = [].freeze