diff --git a/lib/dependencies/sub-process.ts b/lib/dependencies/sub-process.ts
index 0e12e75..fafe879 100644
--- a/lib/dependencies/sub-process.ts
+++ b/lib/dependencies/sub-process.ts
@@ -1,5 +1,4 @@
 import { spawn, SpawnOptions, spawnSync } from 'child_process';
-import { quoteAll } from 'shescape/stateless';
 
 interface ProcessOptions {
   cwd?: string;
@@ -8,7 +7,7 @@ interface ProcessOptions {
 
 function makeSpawnOptions(options?: ProcessOptions) {
   const spawnOptions: SpawnOptions = {
-    shell: true,
+    shell: false,
     env: { ...process.env },
   };
   if (options && options.cwd) {
@@ -39,12 +38,16 @@ export function execute(
   options?: ProcessOptions
 ): Promise<string> {
   const spawnOptions = makeSpawnOptions(options);
-  args = quoteAll(args, { flagProtection: false });
   return new Promise((resolve, reject) => {
     let stdout = '';
     let stderr = '';
 
     const proc = spawn(command, args, spawnOptions);
+
+    proc.on('error', (error) => {
+      reject(error);
+    });
+
     proc.stdout.on('data', (data) => {
       stdout = stdout + data;
     });
@@ -67,7 +70,6 @@ export function executeSync(
   options?: ProcessOptions
 ) {
   const spawnOptions = makeSpawnOptions(options);
-  args = quoteAll(args, { flagProtection: false });
 
   return spawnSync(command, args, spawnOptions);
 }
diff --git a/test/test-utils.ts b/test/test-utils.ts
index c013e38..49082ec 100644
--- a/test/test-utils.ts
+++ b/test/test-utils.ts
@@ -103,7 +103,7 @@ function createVenv(venvDir: string) {
     revert = deactivateVirtualenv();
   }
   try {
-    let proc = subProcess.executeSync('python3 -m venv', [venvDir]);
+    let proc = subProcess.executeSync('python3', ['-m', 'venv', venvDir]);
     if (proc.status !== 0) {
       console.error(proc.stdout.toString() + '\n' + proc.stderr.toString());
       throw new Error('Failed to create virtualenv in ' + venvDir);
diff --git a/test/unit/sub-process.spec.ts b/test/unit/sub-process.spec.ts
index 50f6d09..088ed5f 100644
--- a/test/unit/sub-process.spec.ts
+++ b/test/unit/sub-process.spec.ts
@@ -1,4 +1,4 @@
-import { executeSync } from '../../lib/dependencies/sub-process';
+import { executeSync, execute } from '../../lib/dependencies/sub-process';
 
 describe('Test sub-process.ts', () => {
   it('test restoring proxy setting in executeSync()', async () => {
@@ -89,4 +89,44 @@ describe('Test sub-process.ts', () => {
     );
     expect(output.stdout.toString().trim()).toEqual(expectedNoProxy);
   });
+
+  describe('Security: Command injection protection', () => {
+    it('should prevent command injection in executeSync()', () => {
+      // Test that malicious command strings are treated as literal filenames (not executed)
+      const maliciousCommand = 'python3; echo injected';
+      const result = executeSync(maliciousCommand, ['--version']);
+
+      // Should fail with ENOENT because 'python3; echo injected' is not a valid executable
+      expect(result.status).not.toBe(0);
+      expect((result.error as any)?.code).toBe('ENOENT');
+    });
+
+    it('should prevent command injection in execute()', async () => {
+      // Test that malicious command strings are treated as literal filenames (not executed)
+      const maliciousCommand = 'python3; whoami; echo injected';
+
+      try {
+        await execute(maliciousCommand, ['--version']);
+        fail('Expected execute() to reject with an error');
+      } catch (error: any) {
+        // Should fail with ENOENT because the malicious command is treated as a literal filename
+        expect(error.code).toBe('ENOENT');
+        expect(error.syscall).toBe(`spawn ${maliciousCommand}`);
+      }
+    });
+
+    it('should execute legitimate commands normally', async () => {
+      // Verify that normal commands still work correctly
+      const result = await execute('python3', ['--version']);
+      expect(result).toMatch(/Python \d+\.\d+\.\d+/);
+    });
+
+    it('should handle arguments with special characters safely', async () => {
+      // Verify that special characters in arguments don't enable injection
+      const result = await execute('python3', ['--version', '; echo injected']);
+      // Should only show Python version, not execute the injected command
+      expect(result).toMatch(/Python \d+\.\d+\.\d+/);
+      expect(result).not.toMatch(/injected/);
+    });
+  });
 });