diff --git a/lib/data_layer.ex b/lib/data_layer.ex
index eea56043..652ed117 100644
--- a/lib/data_layer.ex
+++ b/lib/data_layer.ex
@@ -2397,9 +2397,12 @@ defmodule AshPostgres.DataLayer do
           # Include fields with update_defaults (e.g. update_timestamp)
           # even if they aren't in the changeset attributes or upsert_fields.
           # These fields should always be refreshed when an upsert modifies fields.
-          # Can be disabled via context: %{data_layer: %{touch_update_defaults?: false}}
+          # Can be disabled via touch_update_defaults?: false in the changeset
+          # context (either in [:private] or [:data_layer]) or via options map
           touch_update_defaults? =
-            Enum.at(changesets, 0).context[:data_layer][:touch_update_defaults?] != false
+            Map.get(options, :touch_update_defaults?, true) &&
+              Enum.at(changesets, 0).context[:private][:touch_update_defaults?] != false &&
+              Enum.at(changesets, 0).context[:data_layer][:touch_update_defaults?] != false
 
           if touch_update_defaults? do
             update_default_fields =
@@ -3228,12 +3231,21 @@ defmodule AshPostgres.DataLayer do
     else
       keys = keys || Ash.Resource.Info.primary_key(keys)
 
+      touch_update_defaults? =
+        changeset.context[:private][:touch_update_defaults?] != false
+
       update_defaults = update_defaults(resource)
 
       explicitly_changing_attributes =
         changeset.attributes
         |> Map.keys()
-        |> Enum.concat(Keyword.keys(update_defaults))
+        |> then(fn attrs ->
+          if touch_update_defaults? do
+            Enum.concat(attrs, Keyword.keys(update_defaults))
+          else
+            attrs
+          end
+        end)
         |> Kernel.--(Map.get(changeset, :defaults, []))
         |> Kernel.--(keys)
 
@@ -3248,6 +3260,7 @@ defmodule AshPostgres.DataLayer do
              upsert_keys: keys,
              action_select: changeset.action_select,
              upsert_fields: upsert_fields,
+             touch_update_defaults?: touch_update_defaults?,
              return_records?: true
            }) do
         {:ok, []} ->
diff --git a/mix.exs b/mix.exs
index be86f42c..4bf15445 100644
--- a/mix.exs
+++ b/mix.exs
@@ -185,7 +185,7 @@ defmodule AshPostgres.MixProject do
   # Run "mix help deps" to learn about dependencies.
   defp deps do
     [
-      {:ash, ash_version("~> 3.15")},
+      {:ash, ash_version("~> 3.19")},
       {:spark, "~> 2.3 and >= 2.3.4"},
       {:ash_sql, ash_sql_version("~> 0.4 and >= 0.4.3")},
       {:igniter, "~> 0.6 and >= 0.6.29", optional: true},
diff --git a/mix.lock b/mix.lock
index e294b23c..f83bd51c 100644
--- a/mix.lock
+++ b/mix.lock
@@ -1,5 +1,5 @@
 %{
-  "ash": {:hex, :ash, "3.18.0", "9548e0db48e3a51132e0ebe8674fec6a7fa2752fc65bae3f546bca4a98d22ec9", [:mix], [{:crux, ">= 0.1.2 and < 1.0.0-0", [hex: :crux, repo: "hexpm", optional: false]}, {:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:ecto, "~> 3.7", [hex: :ecto, repo: "hexpm", optional: false]}, {:ets, "~> 0.8", [hex: :ets, repo: "hexpm", optional: false]}, {:igniter, ">= 0.6.29 and < 1.0.0-0", [hex: :igniter, repo: "hexpm", optional: true]}, {:jason, ">= 1.0.0", [hex: :jason, repo: "hexpm", optional: false]}, {:picosat_elixir, "~> 0.2", [hex: :picosat_elixir, repo: "hexpm", optional: true]}, {:plug, ">= 0.0.0", [hex: :plug, repo: "hexpm", optional: true]}, {:reactor, "~> 1.0", [hex: :reactor, repo: "hexpm", optional: false]}, {:simple_sat, ">= 0.1.1 and < 1.0.0-0", [hex: :simple_sat, repo: "hexpm", optional: true]}, {:spark, ">= 2.3.14 and < 3.0.0-0", [hex: :spark, repo: "hexpm", optional: false]}, {:splode, "~> 0.3", [hex: :splode, repo: "hexpm", optional: false]}, {:stream_data, "~> 1.0", [hex: :stream_data, repo: "hexpm", optional: false]}, {:telemetry, "~> 1.1", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "22e7cde0856ae4f4024c2d74a5b9d66209fb3959ffe5a018d1c55e86bff90d36"},
+  "ash": {:hex, :ash, "3.19.1", "b5e933547d948e44d27adaed5737195488292fc2066e7fe60dd3ac83a0c4e54f", [:mix], [{:crux, ">= 0.1.2 and < 1.0.0-0", [hex: :crux, repo: "hexpm", optional: false]}, {:decimal, "~> 2.0", [hex: :decimal, repo: "hexpm", optional: false]}, {:ecto, "~> 3.7", [hex: :ecto, repo: "hexpm", optional: false]}, {:ets, "~> 0.8", [hex: :ets, repo: "hexpm", optional: false]}, {:igniter, ">= 0.6.29 and < 1.0.0-0", [hex: :igniter, repo: "hexpm", optional: true]}, {:jason, ">= 1.0.0", [hex: :jason, repo: "hexpm", optional: false]}, {:picosat_elixir, "~> 0.2", [hex: :picosat_elixir, repo: "hexpm", optional: true]}, {:plug, ">= 0.0.0", [hex: :plug, repo: "hexpm", optional: true]}, {:reactor, "~> 1.0", [hex: :reactor, repo: "hexpm", optional: false]}, {:simple_sat, ">= 0.1.1 and < 1.0.0-0", [hex: :simple_sat, repo: "hexpm", optional: true]}, {:spark, ">= 2.3.14 and < 3.0.0-0", [hex: :spark, repo: "hexpm", optional: false]}, {:splode, "~> 0.3", [hex: :splode, repo: "hexpm", optional: false]}, {:stream_data, "~> 1.0", [hex: :stream_data, repo: "hexpm", optional: false]}, {:telemetry, "~> 1.1", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "697ac3e4fc6080cb03b1e4ee9088cb8a313a5299686ba1aa91efc86ec4028b6e"},
   "ash_sql": {:hex, :ash_sql, "0.4.5", "30030675ce995570fcedccd3c0671d85beff03cc0c480e7da5002842dccf0277", [:mix], [{:ash, "~> 3.7", [hex: :ash, repo: "hexpm", optional: false]}, {:ecto, ">= 3.13.4 and < 4.0.0-0", [hex: :ecto, repo: "hexpm", optional: false]}, {:ecto_sql, "~> 3.9", [hex: :ecto_sql, repo: "hexpm", optional: false]}], "hexpm", "131e06e13ebcf06fc8d050267a5b29f6cc8ef6a781712e61a456f17726a64ea5"},
   "benchee": {:hex, :benchee, "1.5.0", "4d812c31d54b0ec0167e91278e7de3f596324a78a096fd3d0bea68bb0c513b10", [:mix], [{:deep_merge, "~> 1.0", [hex: :deep_merge, repo: "hexpm", optional: false]}, {:statistex, "~> 1.1", [hex: :statistex, repo: "hexpm", optional: false]}, {:table, "~> 0.1.0", [hex: :table, repo: "hexpm", optional: true]}], "hexpm", "5b075393aea81b8ae74eadd1c28b1d87e8a63696c649d8293db7c4df3eb67535"},
   "bunt": {:hex, :bunt, "1.0.0", "081c2c665f086849e6d57900292b3a161727ab40431219529f13c4ddcf3e7a44", [:mix], [], "hexpm", "dc5f86aa08a5f6fa6b8096f0735c4e76d54ae5c9fa2c143e5a1fc7c1cd9bb6b5"},
diff --git a/test/bulk_create_test.exs b/test/bulk_create_test.exs
index 1d19a48d..883b2af8 100644
--- a/test/bulk_create_test.exs
+++ b/test/bulk_create_test.exs
@@ -224,7 +224,7 @@ defmodule AshPostgres.BulkCreateTest do
                  upsert?: true,
                  upsert_identity: :uniq_one_and_two,
                  upsert_fields: [:price],
-                 context: %{data_layer: %{touch_update_defaults?: false}},
+                 touch_update_defaults?: false,
                  return_stream?: true,
                  return_errors?: true,
                  return_records?: true
diff --git a/test/upsert_test.exs b/test/upsert_test.exs
index 4337e2d7..b639090f 100644
--- a/test/upsert_test.exs
+++ b/test/upsert_test.exs
@@ -93,4 +93,56 @@ defmodule AshPostgres.Test.UpsertTest do
     assert updated_post.id == id
     assert Decimal.equal?(updated_post.decimal, Decimal.new(5))
   end
+
+  test "upsert with touch_update_defaults? false does not update updated_at" do
+    id = Ash.UUID.generate()
+    past = DateTime.add(DateTime.utc_now(), -60, :second)
+
+    Post
+    |> Ash.Changeset.for_create(:create, %{
+      id: id,
+      title: "title",
+      updated_at: past
+    })
+    |> Ash.create!()
+
+    assert [%{updated_at: backdated}] = Ash.read!(Post)
+    assert DateTime.compare(backdated, past) == :eq
+
+    upserted =
+      Post
+      |> Ash.Changeset.for_create(:create, %{
+        id: id,
+        title: "title2"
+      })
+      |> Ash.create!(upsert?: true, touch_update_defaults?: false)
+
+    assert DateTime.compare(upserted.updated_at, past) == :eq
+  end
+
+  test "upsert with empty upsert_fields does not update updated_at" do
+    id = Ash.UUID.generate()
+    past = DateTime.add(DateTime.utc_now(), -60, :second)
+
+    Post
+    |> Ash.Changeset.for_create(:create, %{
+      id: id,
+      title: "title",
+      updated_at: past
+    })
+    |> Ash.create!()
+
+    assert [%{updated_at: backdated}] = Ash.read!(Post)
+    assert DateTime.compare(backdated, past) == :eq
+
+    upserted =
+      Post
+      |> Ash.Changeset.for_create(:create, %{
+        id: id,
+        title: "title2"
+      })
+      |> Ash.create!(upsert?: true, upsert_fields: [])
+
+    assert DateTime.compare(upserted.updated_at, past) == :eq
+  end
 end