diff --git a/src/RankTracker.test.ts b/src/RankTracker.test.ts
index 0cdd799..94ed977 100644
--- a/src/RankTracker.test.ts
+++ b/src/RankTracker.test.ts
@@ -22,7 +22,7 @@ class TestRankTracker extends RankTracker {
 }
 
 function genId(id: number, date = "20220101"): string {
-  return base64.encode(
+  return base64.encodeBase64(
     `VsHistoryDetail-asdf:asdf:${date}T${
       id.toString().padStart(6, "0")
     }_------------------------------------`,
diff --git a/src/utils.test.ts b/src/utils.test.ts
index ff9df7c..622c4c3 100644
--- a/src/utils.test.ts
+++ b/src/utils.test.ts
@@ -9,12 +9,12 @@ const COOP_ID =
 
 Deno.test("gameId", async () => {
   assertEquals(
-    await gameId(base64.encode(VS_ID)),
+    await gameId(base64.encodeBase64(VS_ID)),
     "042bcac9-6b25-5d2e-a5ea-800939a6dea1",
   );
 
   assertEquals(
-    await gameId(base64.encode(COOP_ID)),
+    await gameId(base64.encodeBase64(COOP_ID)),
     "58329d62-737d-5b43-ac22-e35e6e44b077",
   );
 });
@@ -22,7 +22,7 @@ Deno.test("gameId", async () => {
 Deno.test("s3sCoopGameId", async () => {
   const S3S_COOP_UUID = "be4435b1-0ac5-577b-81bb-766585bec028";
   assertEquals(
-    await s3sCoopGameId(base64.encode(COOP_ID)),
+    await s3sCoopGameId(base64.encodeBase64(COOP_ID)),
     S3S_COOP_UUID,
   );
 });