diff --git a/CHANGELOG.md b/CHANGELOG.md
index 52bec3a4..0c9a7875 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## 5.4.0 (unreleased)
 
 - Added support for scripting to `where` option
+- Added warning for `exists`
 - Added warning for full reindex and `:queue` mode
 - Dropped support for Ruby < 3.1
 
diff --git a/lib/searchkick/query.rb b/lib/searchkick/query.rb
index cbbcc9c6..62b3c99b 100644
--- a/lib/searchkick/query.rb
+++ b/lib/searchkick/query.rb
@@ -1007,6 +1007,11 @@ def where_filters(where)
               when :in
                 filters << term_filters(field, op_value)
               when :exists
+                # TODO add support for false in Searchkick 6
+                if op_value != true
+                  # TODO raise error in Searchkick 6
+                  Searchkick.warn("Passing a value other than true to exists is not supported")
+                end
                 filters << {exists: {field: field}}
               else
                 range_query =
diff --git a/test/where_test.rb b/test/where_test.rb
index fae97ae2..991c4908 100644
--- a/test/where_test.rb
+++ b/test/where_test.rb
@@ -167,6 +167,14 @@ def test_exists
       {name: "Product B"}
     ]
     assert_search "product", ["Product A"], where: {user_ids: {exists: true}}
+    # TODO add support for false in Searchkick 6
+    assert_warns "Passing a value other than true to exists is not supported" do
+      assert_search "product", ["Product A"], where: {user_ids: {exists: false}}
+    end
+    # TODO raise error in Searchkick 6
+    assert_warns "Passing a value other than true to exists is not supported" do
+      assert_search "product", ["Product A"], where: {user_ids: {exists: nil}}
+    end
   end
 
   def test_like