diff --git a/packages/elixir-client/lib/electric/client/ecto_adapter/postgres.ex b/packages/elixir-client/lib/electric/client/ecto_adapter/postgres.ex
index 300489557c..c050705b58 100644
--- a/packages/elixir-client/lib/electric/client/ecto_adapter/postgres.ex
+++ b/packages/elixir-client/lib/electric/client/ecto_adapter/postgres.ex
@@ -537,6 +537,24 @@ if Code.ensure_loaded?(Ecto) do
       end)
     end
 
+    defp dump_binding(Ecto.ULID, {value, cast}) when is_list(value) do
+      value
+      |> Enum.zip(cast)
+      |> Enum.map(&dump_binding(Ecto.ULID, &1))
+      |> Enum.unzip()
+    end
+
+    defp dump_binding(Ecto.ULID, {value, _cast}) do
+      case Ecto.Type.dump(Ecto.ULID, value) do
+        {:ok, dumped} ->
+          {Ecto.UUID.cast!(dumped), dumped}
+
+        :error ->
+          raise ArgumentError,
+                "cannot dump value #{inspect(value)} for type #{inspect(Ecto.ULID)}"
+      end
+    end
+
     defp dump_binding({:parameterized, _} = type, {value, cast}) when is_list(value) do
       value
       |> Enum.zip(cast)
diff --git a/packages/elixir-client/test/electric/client/ecto_adapter/postgres_test.exs b/packages/elixir-client/test/electric/client/ecto_adapter/postgres_test.exs
index e0fd26dfbc..c5813fcac5 100644
--- a/packages/elixir-client/test/electric/client/ecto_adapter/postgres_test.exs
+++ b/packages/elixir-client/test/electric/client/ecto_adapter/postgres_test.exs
@@ -15,6 +15,7 @@ defmodule Electric.Client.EctoAdapter.PostgresTest do
       field(:ff, :float)
       field(:ss, :string)
       field(:uu, :binary_id)
+      field(:eu, Ecto.ULID)
       field(:nd, :naive_datetime)
       field(:ud, :utc_datetime)
       field(:dd, :date)
@@ -40,6 +41,7 @@ defmodule Electric.Client.EctoAdapter.PostgresTest do
     ud = ~U[2024-10-23 14:36:39Z]
     dd = ~D[2024-10-23]
     mm = Decimal.new("199.99")
+    eu = "01KNN1EKXZ6QX7RBY56M1GYDYC"
     ul = "ul_coa2saf4czblth3g5jhleb4574"
 
     assert_where(where(TestTable, ii: ^ii), ~s[("ii" = 1234)])
@@ -47,6 +49,7 @@ defmodule Electric.Client.EctoAdapter.PostgresTest do
     assert_where(where(TestTable, ss: ^ss1), ~s[("ss" = 'my string')])
     assert_where(where(TestTable, ss: ^ss2), ~s[("ss" = 'it''s mine')])
     assert_where(where(TestTable, uu: ^uu), ~s[("uu" = '247a6f62-9f05-4ac6-8314-89e77177d1e3')])
+    assert_where(where(TestTable, eu: ^eu), ~s[("eu" = '019d6a17-4fbf-35fa-7c2f-c535030f37cc')])
     assert_where(where(TestTable, nd: ^nd), ~s[("nd" = '2024-10-23T14:36:39'::timestamp)])
     assert_where(where(TestTable, ud: ^ud), ~s[("ud" = '2024-10-23T14:36:39Z'::timestamptz)])
     assert_where(where(TestTable, dd: ^dd), ~s[("dd" = '2024-10-23'::date)])
@@ -66,6 +69,7 @@ defmodule Electric.Client.EctoAdapter.PostgresTest do
     values_ff = [3.14, 2.71, 6.626]
     values_mm = [Decimal.new("3.14"), Decimal.new("2.71"), Decimal.new("6.626")]
     values_mm2 = [Decimal.new("9.99")]
+    values_eu = ["01KNN1EKXZ6QX7RBY56M1GYDYC", "01JXA5469C68QNGM0N5YA0XNSN"]
     ff = 3.14
 
     assert_where(from(t in TestTable) |> where([t], t.ii in [1, 2, 3]), ~s|("ii" IN (1,2,3))|)
@@ -87,6 +91,11 @@ defmodule Electric.Client.EctoAdapter.PostgresTest do
       ~s|("ff" IN (3.14::float,2.71::float,6.626::float))|
     )
 
+    assert_where(
+      from(t in TestTable) |> where([t], t.eu in ^values_eu),
+      ~s|("eu" IN ('019d6a17-4fbf-35fa-7c2f-c535030f37cc','01975452-192c-322f-5850-152f940ed735'))|
+    )
+
     assert_where(
       from(t in TestTable) |> where([t], t.mm in ^values_mm),
       ~s|("mm" IN (3140000,2710000,6626000))|
diff --git a/packages/elixir-client/test/electric/client/ecto_adapter_test.exs b/packages/elixir-client/test/electric/client/ecto_adapter_test.exs
index 7bf9ef9210..7d4bc21871 100644
--- a/packages/elixir-client/test/electric/client/ecto_adapter_test.exs
+++ b/packages/elixir-client/test/electric/client/ecto_adapter_test.exs
@@ -200,6 +200,23 @@ defmodule Electric.Client.EctoAdapterTest do
              } = EctoAdapter.shape_from_query!(query)
     end
 
+    test "supports where clause with Ecto.ULID bound params" do
+      ulid = "01KNN1EKXZ6QX7RBY56M1GYDYC"
+      column_names = column_names(ULIDTable)
+
+      query =
+        from(t in ULIDTable,
+          where: t.id == ^ulid
+        )
+
+      assert %Electric.Client.ShapeDefinition{
+               table: "ulid_table",
+               where: ~s[("id" = '019d6a17-4fbf-35fa-7c2f-c535030f37cc')],
+               columns: ^column_names,
+               parser: {EctoAdapter, ULIDTable}
+             } = EctoAdapter.shape_from_query!(query)
+    end
+
     test "with where clause" do
       price1 = Decimal.new("2.0")
       net_price1 = Decimal.new("2.5")