diff --git a/bin/cli.js b/bin/cli.js
index ae90a17..5584d95 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -20,7 +20,6 @@ program
   .option("--coverageLimit [error warning...]", "set warn(yellow) and error(red) upper limit in coverage report")
   .option("--collectCoverage <boolean>", "whether to collect coverage information and report")
 
-  .option("--testcase <testcases...>", "run only specified test cases deprecated, use --testFiles instead")
   .option("--testFiles <testFiles...>", "run only specified test files")
   .option("--testNamePattern <test name pattern>", "run only tests with a name that matches the regex pattern")
   .option("--onlyFailures", "Run tests that failed in the previous")
@@ -49,15 +48,7 @@ if (includes === undefined) {
 const excludes = config.exclude || [];
 validateArgument(includes, excludes);
 
-if (options.testcase !== undefined) {
-  console.log(
-    chalk.yellowBright(
-      "Warning: --testcase is deprecated, please use --testFiles instead, --testcase will be removed in next versions"
-    )
-  );
-}
-const testFiles = options.testFiles || options.testcase;
-
+const testFiles = options.testFiles ?? null;
 const onlyFailures = options.onlyFailures || false;
 const testNamePattern = options.testNamePattern ?? null;
 
@@ -70,7 +61,7 @@ if (onlyFailures && testNamePattern !== null) {
 const collectCoverage =
   Boolean(options.collectCoverage) ||
   config.collectCoverage ||
-  (testFiles === undefined && options.testNamePattern === undefined && !onlyFailures);
+  (testFiles === null && options.testNamePattern === undefined && !onlyFailures);
 
 const getBoolean = (optionValue, configValue) => {
   if (optionValue !== undefined) {
diff --git a/docs/release-note.md b/docs/release-note.md
index 4935c38..57ad521 100644
--- a/docs/release-note.md
+++ b/docs/release-note.md
@@ -5,6 +5,7 @@
 🔄 Break Changes
 
 - Changed the default value of `isolated` from `true` to `false`.
+- Remove deprecated `--testcase` CLI option.
 
 🛠️ Improvements
 
diff --git a/src/interface.ts b/src/interface.ts
index 54560b0..ad42a5c 100644
--- a/src/interface.ts
+++ b/src/interface.ts
@@ -191,7 +191,7 @@ export interface TestOption {
   excludes: string[];
   entryFiles: string[] | null;
 
-  testFiles: string[] | undefined;
+  testFiles: string[] | null;
   testNamePattern: string | null;
   collectCoverage: boolean;
   onlyFailures: boolean;
diff --git a/tests/ts/test/core/analyze.test.ts b/tests/ts/test/core/analyze.test.ts
index d2695fb..42b003a 100644
--- a/tests/ts/test/core/analyze.test.ts
+++ b/tests/ts/test/core/analyze.test.ts
@@ -6,7 +6,7 @@ describe("entry files", () => {
       {
         includes: ["tests/ts/fixture/src"],
         excludes: [],
-        testFiles: undefined,
+        testFiles: null,
         testNamePattern: null,
         entryFiles: ["tests/ts/fixture/src/main.ts"],
       },
@@ -19,7 +19,7 @@ describe("entry files", () => {
       {
         includes: ["tests/ts/fixture/src"],
         excludes: [],
-        testFiles: undefined,
+        testFiles: null,
         testNamePattern: null,
         entryFiles: [],
       },
@@ -32,7 +32,7 @@ describe("entry files", () => {
       {
         includes: ["tests/ts/fixture/src"],
         excludes: [],
-        testFiles: undefined,
+        testFiles: null,
         testNamePattern: null,
         entryFiles: null,
       },