diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index fa9702f..4430700 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -48,7 +48,7 @@ jobs:
           - macos-latest
           - ubuntu-latest
         version:
-          - "1.28.1"
+          - "1.28"
           - "1.x"
         host_version:
           - vim: "v9.0.0472"
diff --git a/denops_test/runner.ts b/denops_test/runner.ts
index 1f58878..e3feb41 100644
--- a/denops_test/runner.ts
+++ b/denops_test/runner.ts
@@ -5,7 +5,7 @@ export type RunMode = "vim" | "nvim";
 
 /** Runner option */
 export interface RunOptions
-  extends Omit<Deno.RunOptions, "cmd" | "stdin" | "stdout" | "stderr"> {
+  extends Omit<Deno.CommandOptions, "cmd" | "stdin" | "stdout" | "stderr"> {
   verbose?: boolean;
 }
 
@@ -16,19 +16,20 @@ export function run(
   mode: RunMode,
   cmds: string[],
   options: RunOptions = {},
-): Deno.Process {
-  const cmd = [...buildArgs(mode), ...cmds.flatMap((c) => ["-c", c])];
+): Deno.ChildProcess {
+  const [cmd, args] = buildArgs(mode);
+  args.unshift(...cmds.flatMap((c) => ["-c", c]));
   if (options.verbose) {
-    cmd.unshift("--cmd", "redir >> /dev/stdout");
+    args.unshift("--cmd", "redir >> /dev/stdout");
   }
-  const proc = Deno.run({
-    cmd,
+  const command = new Deno.Command(cmd, {
+    args,
     env: options.env,
     stdin: "piped",
     stdout: options.verbose ? "inherit" : "null",
     stderr: options.verbose ? "inherit" : "null",
   });
-  return proc;
+  return command.spawn();
 }
 
 /**
@@ -44,28 +45,17 @@ export function isRunMode(mode: string): mode is RunMode {
   }
 }
 
-function buildArgs(mode: RunMode): string[] {
+function buildArgs(mode: RunMode): [string, string[]] {
   switch (mode) {
     case "vim":
       return [
         VIM_EXECUTABLE,
-        "-u",
-        "NONE",
-        "-i",
-        "NONE",
-        "-n",
-        "-N",
-        "-X",
-        "-e",
-        "-s",
+        ["-u", "NONE", "-i", "NONE", "-n", "-N", "-X", "-e", "-s"],
       ];
     case "nvim":
       return [
         NVIM_EXECUTABLE,
-        "--clean",
-        "--embed",
-        "--headless",
-        "-n",
+        ["--clean", "--embed", "--headless", "-n"],
       ];
   }
 }
diff --git a/denops_test/with.ts b/denops_test/with.ts
index e6d015a..376ec9f 100644
--- a/denops_test/with.ts
+++ b/denops_test/with.ts
@@ -100,10 +100,9 @@ export async function withDenops(
       },
     );
   } finally {
-    proc.stdin?.close();
-    await killProcess(proc);
-    await proc.status();
-    proc.close();
+    proc.stdin.close();
+    proc.kill();
+    await proc.status;
     conn.close();
     listener.close();
   }
@@ -123,20 +122,3 @@ async function newDenopsImpl(
   const { DenopsImpl } = await import(url.href);
   return new DenopsImpl(pluginName, meta, session);
 }
-
-async function killProcess(proc: Deno.Process): Promise<void> {
-  if (Deno.build.os === "windows") {
-    // Signal API in Deno v1.14.0 on Windows
-    // does not work so use `taskkill` for now
-    const p = Deno.run({
-      cmd: ["taskkill", "/pid", proc.pid.toString(), "/F"],
-      stdin: "null",
-      stdout: "null",
-      stderr: "null",
-    });
-    await p.status();
-    p.close();
-  } else {
-    proc.kill("SIGTERM");
-  }
-}