diff --git a/.tool-versions b/.tool-versions
index 44acbf0..ce0360e 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,2 +1,2 @@
-erlang 26.0.2
-elixir 1.15.4
+erlang 27.0.1
+elixir 1.17.2-otp-27
diff --git a/lib/checks/valid_next_state.ex b/lib/checks/valid_next_state.ex
index 00c301d..d127af6 100644
--- a/lib/checks/valid_next_state.ex
+++ b/lib/checks/valid_next_state.ex
@@ -20,9 +20,9 @@ defmodule AshStateMachine.Checks.ValidNextState do
         Ash.Changeset.get_attribute(changeset, attribute) ||
           AshStateMachine.Info.state_machine_default_initial_state!(changeset.resource)
 
-      {:ok, new_state in AshStateMachine.Info.state_machine_initial_states!(changeset.resource)}
+      new_state in AshStateMachine.Info.state_machine_initial_states!(changeset.resource)
     else
-      {:ok, true}
+      true
     end
   end
 
@@ -44,7 +44,7 @@ defmodule AshStateMachine.Checks.ValidNextState do
       all_states = AshStateMachine.Info.state_machine_all_states(changeset.resource)
 
       if not is_nil(target) && !Ash.Expr.expr?(target) && target not in all_states do
-        {:ok, false}
+        false
       else
         states_expr =
           Enum.reduce(transitions, nil, fn transition, expr ->
@@ -60,7 +60,7 @@ defmodule AshStateMachine.Checks.ValidNextState do
       end
     else
       # state transitions are checked in validations when using `transition_state`
-      {:ok, true}
+      true
     end
   end
 end
diff --git a/test/ash_state_machine_test.exs b/test/ash_state_machine_test.exs
index 117235e..ae19b58 100644
--- a/test/ash_state_machine_test.exs
+++ b/test/ash_state_machine_test.exs
@@ -28,7 +28,7 @@ defmodule AshStateMachineTest do
 
     test "`from: :*` can transition from any state" do
       for state <- [:pending, :confirmed, :on_its_way, :arrived, :error] do
-        assert {:ok, machine} = Order.abort(%Order{state: state})
+        assert {:ok, machine} = Order.abort!(%Order{state: state})
         assert machine.state == :aborted
       end
     end