diff --git a/functions/sample_function_test.ts b/functions/sample_function_test.ts
index 102e2b9..65c2669 100644
--- a/functions/sample_function_test.ts
+++ b/functions/sample_function_test.ts
@@ -3,9 +3,9 @@ import {
   assertEquals,
   assertExists,
   assertStringIncludes,
-} from "https://deno.land/std@0.153.0/testing/asserts.ts";
+} from "std/testing/asserts.ts";
 import SampleFunction from "./sample_function.ts";
-import * as mf from "https://deno.land/x/mock_fetch@0.3.0/mod.ts";
+import * as mf from "mock-fetch/mod.ts";
 
 const { createContext } = SlackFunctionTester("sample_function");
 
diff --git a/import_map.json b/import_map.json
index c1e7639..53d8693 100644
--- a/import_map.json
+++ b/import_map.json
@@ -1,6 +1,8 @@
 {
   "imports": {
     "deno-slack-sdk/": "https://deno.land/x/deno_slack_sdk@2.4.1/",
-    "deno-slack-api/": "https://deno.land/x/deno_slack_api@2.1.2/"
+    "deno-slack-api/": "https://deno.land/x/deno_slack_api@2.1.2/",
+    "std/": "https://deno.land/std@0.183.0/",
+    "mock-fetch/": "https://deno.land/x/mock_fetch@0.3.0/"
   }
 }