diff --git a/src/Command/InstallCommand.php b/src/Command/InstallCommand.php
index 77257e98..1e6c81b4 100644
--- a/src/Command/InstallCommand.php
+++ b/src/Command/InstallCommand.php
@@ -80,6 +80,10 @@ public function execute(InputInterface $input, OutputInterface $output): int
             return self::INVALID;
         }
 
+        if ($installFromLock && CommandHelper::noDev($input)) {
+            $this->io->writeError('<warning>The --no-dev option has no effect when used with --from-lock; all extensions in the lock file will be installed.</warning>');
+        }
+
         if (! $installFromLock && ! $input->getArgument(CommandHelper::ARG_REQUESTED_PACKAGE_AND_VERSION)) {
             return ($this->invokeSubCommand)(
                 $this,
diff --git a/test/unit/Command/InstallCommandTest.php b/test/unit/Command/InstallCommandTest.php
index 6e77cb7e..531ace5a 100644
--- a/test/unit/Command/InstallCommandTest.php
+++ b/test/unit/Command/InstallCommandTest.php
@@ -4,10 +4,18 @@
 
 namespace Php\PieUnitTest\Command;
 
+use Composer\IO\BufferIO;
 use Php\Pie\Command\InstallCommand;
+use Php\Pie\Command\InvokeSubCommand;
+use Php\Pie\ComposerIntegration\ComposerIntegrationHandler;
 use Php\Pie\Container;
+use Php\Pie\DependencyResolver\DependencyInstaller\PrescanSystemDependencies;
+use Php\Pie\DependencyResolver\DependencyResolver;
+use Php\Pie\Installing\InstallForPhpProject\FindMatchingPackages;
+use Php\Pie\SelfManage\BuildTools\CheckAllBuildTools;
 use PHPUnit\Framework\Attributes\CoversClass;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Console\Tester\CommandTester;
 
 #[CoversClass(InstallCommand::class)]
 final class InstallCommandTest extends TestCase
@@ -19,4 +27,34 @@ public function testFromLockOptionExistsOnInstallCommand(): void
 
         self::assertTrue($definition->hasOption(InstallCommand::OPTION_FROM_LOCK));
     }
+
+    public function testNoDevWithFromLockWarnsThatNoDevHasNoEffect(): void
+    {
+        $io = new BufferIO();
+
+        $composerIntegrationHandler = $this->createMock(ComposerIntegrationHandler::class);
+        $composerIntegrationHandler->expects(self::once())->method('runInstall');
+
+        $commandTester = new CommandTester(new InstallCommand(
+            Container::testFactory(),
+            $this->createMock(DependencyResolver::class),
+            $this->createMock(PrescanSystemDependencies::class),
+            $composerIntegrationHandler,
+            $this->createMock(InvokeSubCommand::class),
+            $this->createMock(FindMatchingPackages::class),
+            $io,
+            $this->createMock(CheckAllBuildTools::class),
+        ));
+
+        $commandTester->execute([
+            '--from-lock' => true,
+            '--no-dev' => true,
+        ]);
+
+        $commandTester->assertCommandIsSuccessful();
+        self::assertStringContainsString(
+            'The --no-dev option has no effect when used with --from-lock',
+            $io->getOutput(),
+        );
+    }
 }