diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 9e626df950..5425ad184a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -21,7 +21,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [7.3, 7.4, 8.0, 8.1, 8.2, 8.3, 8.4]
+        php: [7.3, 7.4, 8.0, 8.1, 8.2, 8.3, 8.4, 8.5]
 
     steps:
       - name: Generate french locale.
@@ -46,7 +46,7 @@ jobs:
         run: composer self-update
 
       - name: Install dependencies with composer.
-        run: composer update $DEFAULT_COMPOSER_FLAGS
+        run: composer update $DEFAULT_COMPOSER_FLAGS ${{ matrix.php == 8.5 && '--ignore-platform-reqs' || '' }}
 
       - name: Run tests with PHPUnit.
         run: vendor/bin/phpunit ${{ env.PHPUNIT_COMMAND }}
diff --git a/framework/CHANGELOG.md b/framework/CHANGELOG.md
index 3435d9a60a..bf2d841413 100644
--- a/framework/CHANGELOG.md
+++ b/framework/CHANGELOG.md
@@ -12,7 +12,7 @@ Yii Framework 2 Change Log
 - Bug #20453: Fix PHPStan/Psalm types in `yii\web\View` (max-s-lab)
 - Enh #20461: Add PHPStan/Psalm annotations for `yii\filters\auth\AuthInterface` (max-s-lab)
 - Bug #20459: Fix return type in `RequestParserInterface::parse` (max-s-lab)
-
+- Bug #20475: Fix `Formatter` class `asScientific()` method for PHP `8.5` `sprintf` precision change (`6` to `0`) (terabytesoftw)
 
 2.0.53 June 27, 2025
 --------------------
diff --git a/framework/i18n/Formatter.php b/framework/i18n/Formatter.php
index 35deac4c6f..2a7066c9db 100644
--- a/framework/i18n/Formatter.php
+++ b/framework/i18n/Formatter.php
@@ -1261,10 +1261,12 @@ class Formatter extends Component
         if ($value === null) {
             return $this->nullDisplay;
         }
+
         $value = $this->normalizeNumericValue($value);
 
         if ($this->_intlLoaded) {
             $f = $this->createNumberFormatter(NumberFormatter::SCIENTIFIC, $decimals, $options, $textOptions);
+
             if (($result = $f->format($value)) === false) {
                 throw new InvalidArgumentException('Formatting scientific number value failed: ' . $f->getErrorCode() . ' ' . $f->getErrorMessage());
             }
@@ -1276,7 +1278,12 @@ class Formatter extends Component
             return sprintf("%.{$decimals}E", $value);
         }
 
-        return sprintf('%.E', $value);
+        // PHP 8.5+ changed sprintf('%.E') behavior: empty precision now defaults to '0' instead of '6'
+        // Specify explicit precision to maintain backward compatibility
+        // @link https://github.com/php/php-src/commit/5ed8b2be5533fbd4db95d9724d268eb9c9741f14
+        $format = PHP_VERSION_ID >= 80500 ? '%.6E' : '%.E';
+
+        return sprintf($format, $value);
     }
 
     /**