diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 3d692c03..c3757c97 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -9,6 +9,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 The format of this change log follows the advice given at [Keep a CHANGELOG](http://keepachangelog.com).
 
 ## [Unreleased]
+
+### Added
+- `--selenium` option or `MOODLE_BEHAT_SELENIUM_IMAGE` env variable to `behat` to specify Selenium Docker image.
+
 ### Changed
 - Updated all uses of `actions/checkout` from `v3` (using node 16) to `v4` (using node 20), because [actions using node 16 are deprecated](https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/) and will stop working in the future.
 - ACTION SUGGESTED: In order to avoid the node 16 deprecation warnings, update your workflows to use `actions/checkout@v4`.
diff --git a/docs/CLI.md b/docs/CLI.md
index df8a3bb5..5fedbd7d 100644
--- a/docs/CLI.md
+++ b/docs/CLI.md
@@ -241,7 +241,7 @@ Run Behat on a plugin
 
 ### Usage
 
-* `behat [-m|--moodle MOODLE] [-p|--profile PROFILE] [--suite SUITE] [--tags TAGS] [--name NAME] [--start-servers] [--auto-rerun AUTO-RERUN] [--dump] [--] <plugin>`
+* `behat [-m|--moodle MOODLE] [-p|--profile PROFILE] [--suite SUITE] [--tags TAGS] [--name NAME] [--start-servers] [--auto-rerun AUTO-RERUN] [--selenium SELENIUM] [--dump] [--] <plugin>`
 
 Run Behat on a plugin
 
@@ -327,6 +327,16 @@ Number of times to rerun failures
 * Is negatable: no
 * Default: `2`
 
+#### `--selenium`
+
+Selenium Docker image
+
+* Accept value: yes
+* Is value required: no
+* Is multiple: no
+* Is negatable: no
+* Default: `NULL`
+
 #### `--dump`
 
 Print contents of Behat failure HTML files
@@ -2385,4 +2395,4 @@ Do not ask any interactive question
 * Is value required: no
 * Is multiple: no
 * Is negatable: no
-* Default: `false`
\ No newline at end of file
+* Default: `false`
diff --git a/src/Command/BehatCommand.php b/src/Command/BehatCommand.php
index 3da0074f..6a7ab2ab 100644
--- a/src/Command/BehatCommand.php
+++ b/src/Command/BehatCommand.php
@@ -25,25 +25,6 @@ class BehatCommand extends AbstractMoodleCommand
 {
     use ExecuteTrait;
 
-    /**
-     * Selenium legacy Firefox image.
-     */
-    private string $seleniumLegacyFirefoxImage = 'selenium/standalone-firefox:2.53.1';
-
-    /**
-     * Selenium standalone Firefox image.
-     *
-     * @todo: Make this configurable.
-     */
-    private string $seleniumFirefoxImage = 'selenium/standalone-firefox:3';
-
-    /**
-     * Selenium standalone Chrome image.
-     *
-     * @todo: Make this configurable.
-     */
-    private string $seleniumChromeImage = 'selenium/standalone-chrome:3';
-
     /**
      * Wait this many microseconds for Selenium server to start/stop.
      *
@@ -65,6 +46,7 @@ protected function configure(): void
             ->addOption('name', null, InputOption::VALUE_REQUIRED, 'Behat name option to use', '')
             ->addOption('start-servers', null, InputOption::VALUE_NONE, 'Start Selenium and PHP servers')
             ->addOption('auto-rerun', null, InputOption::VALUE_REQUIRED, 'Number of times to rerun failures', 2)
+            ->addOption('selenium', null, InputOption::VALUE_REQUIRED, 'Selenium Docker image')
             ->addOption('dump', null, InputOption::VALUE_NONE, 'Print contents of Behat failure HTML files')
             ->setDescription('Run Behat on a plugin');
     }
@@ -150,13 +132,7 @@ private function startServerProcesses(InputInterface $input): void
             $profile = getenv('MOODLE_BEHAT_DEFAULT_BROWSER') ?: (getenv('MOODLE_APP') ? 'chrome' : 'firefox');
         }
 
-        if ($profile === 'chrome') {
-            $image = $this->seleniumChromeImage;
-        } elseif ($this->usesLegacyPhpWebdriver()) {
-            $image = $this->seleniumLegacyFirefoxImage;
-        } else {
-            $image = $this->seleniumFirefoxImage;
-        }
+        $image = $this->getSeleniumImage($input, $profile);
 
         $cmd = [
             'docker',
@@ -226,4 +202,23 @@ private function usesLegacyPhpWebdriver(): bool
 
         return strpos(file_get_contents($composerlock), 'instaclick/php-webdriver') !== false;
     }
+
+    private function getSeleniumImage(InputInterface $input, string $profile): string
+    {
+        $image = $input->getOption('selenium') ?: getenv('MOODLE_BEHAT_SELENIUM_IMAGE');
+
+        if (!empty($image)) {
+            return $image;
+        }
+
+        if ($profile === 'chrome') {
+            return 'selenium/standalone-chrome:3';
+        }
+
+        if ($this->usesLegacyPhpWebdriver()) {
+            return 'selenium/standalone-firefox:2.53.1';
+        }
+
+        return 'selenium/standalone-firefox:3';
+    }
 }
diff --git a/tests/Command/BehatCommandTest.php b/tests/Command/BehatCommandTest.php
index 88751df4..653a61e1 100644
--- a/tests/Command/BehatCommandTest.php
+++ b/tests/Command/BehatCommandTest.php
@@ -46,7 +46,10 @@ protected function executeCommand($pluginDir = null, $moodleDir = null, array $c
             $cmdOptions
         );
         $commandTester->execute($cmdOptions);
-        $this->lastCmd = $command->execute->lastCmd; // We need this for assertions against the command run.
+
+        // We need these for assertions against the commands run.
+        $this->allCmds = $command->execute->allCmds;
+        $this->lastCmd = $command->execute->lastCmd;
 
         return $commandTester;
     }
@@ -69,6 +72,51 @@ public function testExecuteWithTags()
         $this->assertDoesNotMatchRegularExpression('/--tags=@local_ci/', $this->lastCmd);
     }
 
+    public function testExecuteWithSeleniumImageOption()
+    {
+        $commandTester = $this->executeCommand(null, null, ['--start-servers' => true, '--selenium' => 'seleniarm/standalone-chromium:latest']);
+        $this->assertSame(0, $commandTester->getStatusCode());
+        $this->assertMatchesRegularExpression('/seleniarm\/standalone-chromium:latest/', $this->allCmds[1]);
+    }
+
+    public function testExecuteWithSeleniumImageEnv()
+    {
+        putenv('MOODLE_BEHAT_SELENIUM_IMAGE=seleniarm/standalone-chromium:latest');
+
+        $commandTester = $this->executeCommand(null, null, ['--start-servers' => true]);
+        $this->assertSame(0, $commandTester->getStatusCode());
+        $this->assertMatchesRegularExpression('/seleniarm\/standalone-chromium:latest/', $this->allCmds[1]);
+    }
+
+    public function testExecuteWithChromeProfile()
+    {
+        putenv('MOODLE_BEHAT_SELENIUM_IMAGE=');
+
+        $commandTester = $this->executeCommand(null, null, ['--start-servers' => true, '--profile' => 'chrome']);
+        $this->assertSame(0, $commandTester->getStatusCode());
+        $this->assertMatchesRegularExpression('/selenium\/standalone-chrome:3/', $this->allCmds[1]);
+    }
+
+    public function testExecuteWithFirefoxProfile()
+    {
+        putenv('MOODLE_BEHAT_SELENIUM_IMAGE=');
+        file_put_contents("{$this->moodleDir}/composer.lock", '');
+
+        $commandTester = $this->executeCommand(null, null, ['--start-servers' => true, '--profile' => 'firefox']);
+        $this->assertSame(0, $commandTester->getStatusCode());
+        $this->assertMatchesRegularExpression('/selenium\/standalone-firefox:3/', $this->allCmds[1]);
+    }
+
+    public function testExecuteWithLegacyFirefoxProfile()
+    {
+        putenv('MOODLE_BEHAT_SELENIUM_IMAGE=');
+        file_put_contents("{$this->moodleDir}/composer.lock", 'instaclick/php-webdriver');
+
+        $commandTester = $this->executeCommand(null, null, ['--start-servers' => true, '--profile' => 'firefox']);
+        $this->assertSame(0, $commandTester->getStatusCode());
+        $this->assertMatchesRegularExpression('/selenium\/standalone-firefox:2.53.1/', $this->allCmds[1]);
+    }
+
     public function testExecuteWithName()
     {
         $featureName = 'With "double quotes" and \'single quotes\'';
diff --git a/tests/Command/PHPUnitCommandTest.php b/tests/Command/PHPUnitCommandTest.php
index 959a3a34..1d3f7769 100644
--- a/tests/Command/PHPUnitCommandTest.php
+++ b/tests/Command/PHPUnitCommandTest.php
@@ -45,7 +45,10 @@ protected function executeCommand($pluginDir = null, $moodleDir = null, array $c
             $cmdOptions
         );
         $commandTester->execute($cmdOptions);
-        $this->lastCmd = $command->execute->lastCmd; // We need this for assertions against the command run.
+
+        // We need these for assertions against the commands run.
+        $this->allCmds = $command->execute->allCmds;
+        $this->lastCmd = $command->execute->lastCmd;
 
         return $commandTester;
     }
diff --git a/tests/MoodleTestCase.php b/tests/MoodleTestCase.php
index 00e269e3..26501f5f 100644
--- a/tests/MoodleTestCase.php
+++ b/tests/MoodleTestCase.php
@@ -16,7 +16,10 @@ class MoodleTestCase extends FilesystemTestCase
 {
     protected string $moodleDir;
     protected string $pluginDir;
-    protected string $lastCmd = ''; // We need this for assertions against the command run.
+
+    // We need these for assertions against the commands run.
+    protected array $allCmds  = [];
+    protected string $lastCmd = '';
 
     protected function setUp(): void
     {
@@ -24,6 +27,7 @@ protected function setUp(): void
 
         $this->moodleDir = $this->tempDir;
         $this->pluginDir = $this->tempDir . '/local/ci';
+        $this->allCmds   = [];
         $this->lastCmd   = '';
 
         $this->fs->mirror(__DIR__ . '/Fixture/moodle', $this->moodleDir);