diff --git a/deno.lock b/deno.lock
new file mode 100644
index 0000000..402e087
--- /dev/null
+++ b/deno.lock
@@ -0,0 +1,9 @@
+{
+  "version": "2",
+  "remote": {
+    "https://deno.land/std@0.165.0/fmt/colors.ts": "9e36a716611dcd2e4865adea9c4bec916b5c60caad4cdcdc630d4974e6bb8bd4",
+    "https://deno.land/std@0.165.0/testing/_diff.ts": "a23e7fc2b4d8daa3e158fa06856bedf5334ce2a2831e8bf9e509717f455adb2c",
+    "https://deno.land/std@0.165.0/testing/_format.ts": "cd11136e1797791045e639e9f0f4640d5b4166148796cad37e6ef75f7d7f3832",
+    "https://deno.land/std@0.165.0/testing/asserts.ts": "1e340c589853e82e0807629ba31a43c84ebdcdeca910c4a9705715dfdb0f5ce8"
+  }
+}
diff --git a/fsm.test.ts b/fsm.test.ts
index ffbcb1f..add5e17 100644
--- a/fsm.test.ts
+++ b/fsm.test.ts
@@ -17,9 +17,9 @@
 
 import {
   assertEquals,
+  assertRejects,
   assertThrows,
-  assertThrowsAsync,
-} from "https://deno.land/std@0.105.0/testing/asserts.ts";
+} from "https://deno.land/std@0.165.0/testing/asserts.ts";
 import * as fsm from "./fsm.ts";
 
 enum ProjectStatus {
@@ -168,7 +168,7 @@ Deno.test("should throw error if transition to the state doesn't exist", () => {
   const sm = new fsm.StateMachineBuilder()
     .withStates(Object.values(ProjectStatus))
     .build(ProjectStatus.Pending);
-  assertThrowsAsync(
+  assertRejects(
     () => sm.tryChangeState(ProjectStatus.Active, null),
     fsm.FsmError,
     `cannot change state from "${ProjectStatus.Pending}" to "${ProjectStatus.Active}"`,
@@ -195,7 +195,7 @@ Deno.test("should throw error if beforeExit action returns false", () => {
       [ProjectStatus.Pending, [ProjectStatus.Active]],
     ])
     .build(ProjectStatus.Pending);
-  assertThrowsAsync(
+  assertRejects(
     () => sm.tryChangeState(ProjectStatus.Active, null),
     fsm.FsmError,
     `cannot change state from "${ProjectStatus.Pending}" to "${ProjectStatus.Active}"`,