diff --git a/readme.txt b/readme.txt
index e0a361d..df1a180 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Tags: rollbar, full stack, error, tracking, error tracking, error reporting, rep
 Requires at least: 6.5.0
 Tested up to: 6.9
 Requires PHP: 8.1
-Stable tag: 3.1.0
+Stable tag: 3.1.1
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -150,6 +150,9 @@ using composer.
 
 == Changelog ==
 
+= Version 3.1.1 (December 22nd 2025) =
+* Fixed composer autoload ClassLoader namespace not replaced by PHPScoper in v3.1.0.
+
 = Version 3.1.0 (December 18th 2025) =
 * Fixed settings values not being saved correctly when they match the default.
 * Added `rollbar_js_nonce` filter to allow customizing the nonce used in the Rollbar JS snippet.
diff --git a/rollbar.php b/rollbar.php
index ecc8cff..8b79903 100755
--- a/rollbar.php
+++ b/rollbar.php
@@ -4,7 +4,7 @@
  * Plugin Name: Rollbar
  * Plugin URI: https://wordpress.org/plugins/rollbar
  * Description: Rollbar full-stack error tracking for WordPress.
- * Version: 3.1.0
+ * Version: 3.1.1
  * Author: Rollbar
  * Author URI: https://rollbar.com
  * Text Domain: rollbar
diff --git a/scoper.inc.php b/scoper.inc.php
index 777ba70..d6e239e 100644
--- a/scoper.inc.php
+++ b/scoper.inc.php
@@ -50,7 +50,7 @@ static function (string $filePath, string $prefix, string $content): string {
             // Fix ClassLoader in string not being prefixed.
             if ($filePath === __DIR__ . '/build/vendor/composer/autoload_real.php') {
                 $content = str_replace(
-                    '(\'Composer\Autoload\ClassLoader\' === $class)',
+                    '(\'Composer\\\\Autoload\\\\ClassLoader\' === $class)',
                     '(\'RollbarWP\Composer\Autoload\ClassLoader\' === $class)',
                     $content,
                 );
diff --git a/src/Plugin.php b/src/Plugin.php
index fa1dff6..a10acc7 100644
--- a/src/Plugin.php
+++ b/src/Plugin.php
@@ -24,7 +24,7 @@
  */
 final class Plugin extends AbstractSingleton
 {
-    public const VERSION = '3.1.0';
+    public const VERSION = '3.1.1';
 
     /**
      * Configuration array for Rollbar.