diff --git a/system/src/Grav/Common/Recovery/RecoveryManager.php b/system/src/Grav/Common/Recovery/RecoveryManager.php
index 4be5331fa..c179e4b24 100644
--- a/system/src/Grav/Common/Recovery/RecoveryManager.php
+++ b/system/src/Grav/Common/Recovery/RecoveryManager.php
@@ -185,7 +185,25 @@ class RecoveryManager
      * @param array $context
      * @return void
      */
-    private function quarantinePlugin(string $slug, array $context): void
+    public function disablePlugin(string $slug, array $context = []): void
+    {
+        $context += [
+            'message' => $context['message'] ?? 'Disabled during upgrade preflight',
+            'file' => $context['file'] ?? '',
+            'line' => $context['line'] ?? null,
+            'created_at' => $context['created_at'] ?? time(),
+            'plugin' => $context['plugin'] ?? $slug,
+        ];
+
+        $this->quarantinePlugin($slug, $context);
+    }
+
+    /**
+     * @param string $slug
+     * @param array $context
+     * @return void
+     */
+    protected function quarantinePlugin(string $slug, array $context): void
     {
         $slug = trim($slug);
         if ($slug === '') {
diff --git a/system/src/Grav/Common/Upgrade/SafeUpgradeService.php b/system/src/Grav/Common/Upgrade/SafeUpgradeService.php
index 6e5a5df12..c3092b013 100644
--- a/system/src/Grav/Common/Upgrade/SafeUpgradeService.php
+++ b/system/src/Grav/Common/Upgrade/SafeUpgradeService.php
@@ -15,6 +15,9 @@ use Grav\Common\Yaml;
 use InvalidArgumentException;
 use RuntimeException;
 use Throwable;
+use RecursiveDirectoryIterator;
+use RecursiveIteratorIterator;
+use FilesystemIterator;
 use function basename;
 use function count;
 use function dirname;
@@ -94,16 +97,21 @@ class SafeUpgradeService
         }
 
         $psrLogConflicts = $this->detectPsrLogConflicts();
+        $monologConflicts = $this->detectMonologConflicts();
         if ($pending) {
             $warnings[] = 'One or more plugins/themes are not up to date.';
         }
         if ($psrLogConflicts) {
             $warnings[] = 'Potential psr/log signature conflicts detected.';
         }
+        if ($monologConflicts) {
+            $warnings[] = 'Potential Monolog logger API incompatibilities detected.';
+        }
 
         return [
             'plugins_pending' => $pending,
             'psr_log_conflicts' => $psrLogConflicts,
+            'monolog_conflicts' => $monologConflicts,
             'warnings' => $warnings,
         ];
     }
@@ -263,6 +271,47 @@ class SafeUpgradeService
         return $conflicts;
     }
 
+    /**
+     * Detect usage of deprecated Monolog `add*` methods removed in newer releases.
+     *
+     * @return array<string, array>
+     */
+    protected function detectMonologConflicts(): array
+    {
+        $conflicts = [];
+        $pluginRoots = glob($this->rootPath . '/user/plugins/*', GLOB_ONLYDIR) ?: [];
+        $pattern = '/->add(?:Debug|Info|Notice|Warning|Error|Critical|Alert|Emergency)\s*\(/i';
+
+        foreach ($pluginRoots as $path) {
+            $iterator = new RecursiveIteratorIterator(
+                new RecursiveDirectoryIterator($path, FilesystemIterator::SKIP_DOTS)
+            );
+
+            foreach ($iterator as $file) {
+                /** @var \SplFileInfo $file */
+                if (!$file->isFile() || strtolower($file->getExtension()) !== 'php') {
+                    continue;
+                }
+
+                $contents = @file_get_contents($file->getPathname());
+                if ($contents === false) {
+                    continue;
+                }
+
+                if (preg_match($pattern, $contents, $match)) {
+                    $slug = basename($path);
+                    $relative = str_replace($this->rootPath . '/', '', $file->getPathname());
+                    $conflicts[$slug][] = [
+                        'file' => $relative,
+                        'method' => trim($match[0]),
+                    ];
+                }
+            }
+        }
+
+        return $conflicts;
+    }
+
     /**
      * Ensure directories flagged for ignoring get hydrated from the current installation.
      *
diff --git a/system/src/Grav/Console/Gpm/PreflightCommand.php b/system/src/Grav/Console/Gpm/PreflightCommand.php
index 63728a5ca..50a33331d 100644
--- a/system/src/Grav/Console/Gpm/PreflightCommand.php
+++ b/system/src/Grav/Console/Gpm/PreflightCommand.php
@@ -25,7 +25,7 @@ class PreflightCommand extends GpmCommand
         $service = $this->createSafeUpgradeService();
         $report = $service->preflight();
 
-        $hasIssues = !empty($report['plugins_pending']) || !empty($report['psr_log_conflicts']) || !empty($report['warnings']);
+        $hasIssues = !empty($report['plugins_pending']) || !empty($report['psr_log_conflicts']) || !empty($report['monolog_conflicts']) || !empty($report['warnings']);
 
         if ($this->getInput()->getOption('json')) {
             $io->writeln(json_encode($report, JSON_PRETTY_PRINT));
@@ -60,6 +60,19 @@ class PreflightCommand extends GpmCommand
             $io->newLine();
         }
 
+        if (!empty($report['monolog_conflicts'])) {
+            $io->writeln('<comment>Potential Monolog logger conflicts</comment>');
+            foreach ($report['monolog_conflicts'] as $slug => $entries) {
+                foreach ($entries as $entry) {
+                    $file = $entry['file'] ?? 'unknown file';
+                    $method = $entry['method'] ?? 'add*';
+                    $io->writeln(sprintf('  - %s (%s in %s)', $slug, $method, $file));
+                }
+            }
+            $io->writeln('    › Update the plugin to use PSR-3 style logger calls (e.g. $logger->error()).');
+            $io->newLine();
+        }
+
         if (!$hasIssues) {
             $io->success('No blocking issues detected.');
         } else {
diff --git a/system/src/Grav/Console/Gpm/SelfupgradeCommand.php b/system/src/Grav/Console/Gpm/SelfupgradeCommand.php
index 2c991e93c..99f863adc 100644
--- a/system/src/Grav/Console/Gpm/SelfupgradeCommand.php
+++ b/system/src/Grav/Console/Gpm/SelfupgradeCommand.php
@@ -22,6 +22,7 @@ use RuntimeException;
 use Symfony\Component\Console\Input\ArrayInput;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Question\ConfirmationQuestion;
+use Symfony\Component\Console\Style\SymfonyStyle;
 use ZipArchive;
 use function count;
 use function is_callable;
@@ -289,9 +290,10 @@ class SelfupgradeCommand extends GpmCommand
         $io = $this->getIO();
         $pending = $preflight['plugins_pending'] ?? [];
         $conflicts = $preflight['psr_log_conflicts'] ?? [];
+        $monologConflicts = $preflight['monolog_conflicts'] ?? [];
         $warnings = $preflight['warnings'] ?? [];
 
-        if (empty($pending) && empty($conflicts)) {
+        if (empty($pending) && empty($conflicts) && empty($monologConflicts)) {
             return true;
         }
 
@@ -319,25 +321,98 @@ class SelfupgradeCommand extends GpmCommand
             return false;
         }
 
-        if ($conflicts) {
-            $io->newLine();
-            $io->writeln('<yellow>Potential psr/log incompatibilities:</yellow>');
-            foreach ($conflicts as $slug => $info) {
-                $requires = $info['requires'] ?? '*';
-                $io->writeln(sprintf('  - %s (requires psr/log %s)', $slug, $requires));
-            }
-            $io->writeln('    › Update the plugin or add "replace": {"psr/log": "*"} to its composer.json and reinstall dependencies.');
-
-            if (!$this->all_yes) {
-                $question = new ConfirmationQuestion('Continue despite psr/log warnings? [y|N] ', false);
-                if (!$io->askQuestion($question)) {
-                    $io->writeln('Aborting self-upgrade. Adjust composer requirements or update affected plugins.');
-
-                    return false;
+        $handled = $this->handleConflicts(
+            $conflicts,
+            static function (SymfonyStyle $io, array $conflicts): void {
+                $io->newLine();
+                $io->writeln('<yellow>Potential psr/log incompatibilities:</yellow>');
+                foreach ($conflicts as $slug => $info) {
+                    $requires = $info['requires'] ?? '*';
+                    $io->writeln(sprintf('  - %s (requires psr/log %s)', $slug, $requires));
                 }
-            }
+            },
+            'Update the plugin or add "replace": {"psr/log": "*"} to its composer.json and reinstall dependencies.',
+            'Aborting self-upgrade. Adjust composer requirements or update affected plugins.',
+            'Proceeding with potential psr/log incompatibilities still active.',
+            'Disabled before upgrade because of psr/log conflict'
+        );
+
+        if (!$handled) {
+            return false;
         }
 
+        $handledMonolog = $this->handleConflicts(
+            $monologConflicts,
+            static function (SymfonyStyle $io, array $conflicts): void {
+                $io->newLine();
+                $io->writeln('<yellow>Potential Monolog logger API incompatibilities:</yellow>');
+                foreach ($conflicts as $slug => $entries) {
+                    foreach ($entries as $entry) {
+                        $file = $entry['file'] ?? 'unknown file';
+                        $method = $entry['method'] ?? 'add*';
+                        $io->writeln(sprintf('  - %s (%s in %s)', $slug, $method, $file));
+                    }
+                }
+            },
+            'Update the plugin to use PSR-3 style logger methods (e.g. $logger->error()) before upgrading.',
+            'Aborting self-upgrade. Update plugins to remove deprecated Monolog add* calls.',
+            'Proceeding with potential Monolog API incompatibilities still active.',
+            'Disabled before upgrade because of Monolog API conflict'
+        );
+
+        if (!$handledMonolog) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * @param array $conflicts
+     * @param callable $printer
+     * @param string $advice
+     * @param string $abortMessage
+     * @param string $continueMessage
+     * @param string $disableNote
+     * @return bool
+     */
+    private function handleConflicts(array $conflicts, callable $printer, string $advice, string $abortMessage, string $continueMessage, string $disableNote): bool
+    {
+        if (empty($conflicts)) {
+            return true;
+        }
+
+        $io = $this->getIO();
+        $printer($io, $conflicts);
+        $io->writeln('    › ' . $advice);
+
+        $choice = $this->all_yes ? 'abort' : $io->choice(
+            'How would you like to proceed?',
+            ['disable', 'continue', 'abort'],
+            'abort'
+        );
+
+        if ($choice === 'abort') {
+            $io->writeln($abortMessage);
+
+            return false;
+        }
+
+        /** @var \Grav\Common\Recovery\RecoveryManager $recovery */
+        $recovery = Grav::instance()['recovery'];
+
+        if ($choice === 'disable') {
+            foreach (array_keys($conflicts) as $slug) {
+                $recovery->disablePlugin($slug, ['message' => $disableNote]);
+                $io->writeln(sprintf('  - Disabled plugin %s.', $slug));
+            }
+            $io->writeln('Continuing with conflicted plugins disabled.');
+
+            return true;
+        }
+
+        $io->writeln($continueMessage);
+
         return true;
     }
 
diff --git a/tests/unit/Grav/Common/Recovery/RecoveryManagerTest.php b/tests/unit/Grav/Common/Recovery/RecoveryManagerTest.php
index 88cc54d2e..f7e7e7375 100644
--- a/tests/unit/Grav/Common/Recovery/RecoveryManagerTest.php
+++ b/tests/unit/Grav/Common/Recovery/RecoveryManagerTest.php
@@ -120,4 +120,25 @@ class RecoveryManagerTest extends \Codeception\TestCase\Test
         $manager = new RecoveryManager($this->tmpDir);
         self::assertNull($manager->getContext());
     }
+
+    public function testDisablePluginRecordsQuarantineWithoutFlag(): void
+    {
+        $plugin = $this->tmpDir . '/user/plugins/problem';
+        Folder::create($plugin);
+
+        $manager = new RecoveryManager($this->tmpDir);
+        $manager->disablePlugin('problem', ['message' => 'Manual disable']);
+
+        $flag = $this->tmpDir . '/system/recovery.flag';
+        self::assertFileDoesNotExist($flag);
+
+        $configFile = $this->tmpDir . '/user/config/plugins/problem.yaml';
+        self::assertFileExists($configFile);
+        self::assertStringContainsString('enabled: false', file_get_contents($configFile));
+
+        $quarantine = $this->tmpDir . '/user/data/upgrades/quarantine.json';
+        self::assertFileExists($quarantine);
+        $decoded = json_decode(file_get_contents($quarantine), true);
+        self::assertSame('Manual disable', $decoded['problem']['message']);
+    }
 }
diff --git a/tests/unit/Grav/Common/Upgrade/SafeUpgradeServiceTest.php b/tests/unit/Grav/Common/Upgrade/SafeUpgradeServiceTest.php
index 15b03f842..b69bef31e 100644
--- a/tests/unit/Grav/Common/Upgrade/SafeUpgradeServiceTest.php
+++ b/tests/unit/Grav/Common/Upgrade/SafeUpgradeServiceTest.php
@@ -30,6 +30,11 @@ class SafeUpgradeServiceTest extends \Codeception\TestCase\Test
             public $conflicts = [
                 'beta' => ['requires' => '^1.0']
             ];
+            public $monolog = [
+                'gamma' => [
+                    ['file' => 'user/plugins/gamma/gamma.php', 'method' => '->addError(']
+                ]
+            ];
 
             protected function detectPendingPluginUpdates(): array
             {
@@ -40,14 +45,20 @@ class SafeUpgradeServiceTest extends \Codeception\TestCase\Test
             {
                 return $this->conflicts;
             }
+
+            protected function detectMonologConflicts(): array
+            {
+                return $this->monolog;
+            }
         };
 
         $result = $service->preflight();
 
         self::assertArrayHasKey('warnings', $result);
-        self::assertCount(2, $result['warnings']);
+        self::assertCount(3, $result['warnings']);
         self::assertArrayHasKey('alpha', $result['plugins_pending']);
         self::assertArrayHasKey('beta', $result['psr_log_conflicts']);
+        self::assertArrayHasKey('gamma', $result['monolog_conflicts']);
     }
 
     public function testPreflightHandlesDetectionFailure(): void
@@ -62,12 +73,18 @@ class SafeUpgradeServiceTest extends \Codeception\TestCase\Test
             {
                 return [];
             }
+
+            protected function detectMonologConflicts(): array
+            {
+                return [];
+            }
         };
 
         $result = $service->preflight();
 
         self::assertSame([], $result['plugins_pending']);
         self::assertSame([], $result['psr_log_conflicts']);
+        self::assertSame([], $result['monolog_conflicts']);
         self::assertCount(1, $result['warnings']);
         self::assertStringContainsString('Cannot reach GPM', $result['warnings'][0]);
     }
@@ -140,6 +157,37 @@ class SafeUpgradeServiceTest extends \Codeception\TestCase\Test
         self::assertArrayHasKey('problem', $conflicts);
     }
 
+    public function testDetectsMonologConflictsFromFilesystem(): void
+    {
+        [$root] = $this->prepareLiveEnvironment();
+        $plugin = $root . '/user/plugins/logger';
+        Folder::create($plugin . '/src');
+        $code = <<<'PHP'
+<?php
+class LoggerTest {
+    public function test(
+        \Monolog\Logger $logger
+    ) {
+        $logger->addError('deprecated');
+    }
+}
+PHP;
+        file_put_contents($plugin . '/src/logger.php', $code);
+
+        $service = new SafeUpgradeService([
+            'root' => $root,
+            'staging_root' => $this->tmpDir . '/staging',
+        ]);
+
+        $method = new ReflectionMethod(SafeUpgradeService::class, 'detectMonologConflicts');
+        $method->setAccessible(true);
+        $conflicts = $method->invoke($service);
+
+        self::assertArrayHasKey('logger', $conflicts);
+        self::assertNotEmpty($conflicts['logger']);
+        self::assertStringContainsString('addError', $conflicts['logger'][0]['method']);
+    }
+
     public function testClearRecoveryFlagRemovesFile(): void
     {
         [$root] = $this->prepareLiveEnvironment();
@@ -190,4 +238,3 @@ class SafeUpgradeServiceTest extends \Codeception\TestCase\Test
         return $package;
     }
 }
-
diff --git a/tests/unit/Grav/Console/Gpm/PreflightCommandTest.php b/tests/unit/Grav/Console/Gpm/PreflightCommandTest.php
index 442166838..85b1fb6eb 100644
--- a/tests/unit/Grav/Console/Gpm/PreflightCommandTest.php
+++ b/tests/unit/Grav/Console/Gpm/PreflightCommandTest.php
@@ -14,6 +14,7 @@ class PreflightCommandTest extends \Codeception\TestCase\Test
         $service = new StubSafeUpgradeService([
             'plugins_pending' => [],
             'psr_log_conflicts' => [],
+            'monolog_conflicts' => [],
             'warnings' => []
         ]);
         $command = new TestPreflightCommand($service);
@@ -31,6 +32,7 @@ class PreflightCommandTest extends \Codeception\TestCase\Test
         $service = new StubSafeUpgradeService([
             'plugins_pending' => ['alpha' => ['type' => 'plugin', 'current' => '1', 'available' => '2']],
             'psr_log_conflicts' => ['beta' => ['requires' => '^1']],
+            'monolog_conflicts' => ['gamma' => [['file' => 'user/plugins/gamma/gamma.php', 'method' => '->addError(']]],
             'warnings' => ['pending updates']
         ]);
         $command = new TestPreflightCommand($service);
@@ -42,6 +44,7 @@ class PreflightCommandTest extends \Codeception\TestCase\Test
         $output = implode("\n", $style->messages);
         self::assertStringContainsString('pending updates', $output);
         self::assertStringContainsString('beta', $output);
+        self::assertStringContainsString('gamma', $output);
     }
 
     /**
diff --git a/tests/unit/Grav/Console/Gpm/SelfupgradeCommandTest.php b/tests/unit/Grav/Console/Gpm/SelfupgradeCommandTest.php
index c11d0c65d..0542f0870 100644
--- a/tests/unit/Grav/Console/Gpm/SelfupgradeCommandTest.php
+++ b/tests/unit/Grav/Console/Gpm/SelfupgradeCommandTest.php
@@ -1,5 +1,6 @@
 <?php
 
+use Codeception\Util\Fixtures;
 use Grav\Console\Gpm\SelfupgradeCommand;
 use Symfony\Component\Console\Input\ArrayInput;
 use Symfony\Component\Console\Input\InputInterface;
@@ -43,7 +44,7 @@ class SelfupgradeCommandTest extends \Codeception\TestCase\Test
     public function testHandlePreflightReportAbortsOnPendingWhenDeclined(): void
     {
         $command = new TestSelfupgradeCommand();
-        [$style] = $this->injectIo($command, [false]);
+        [$style] = $this->injectIo($command);
         $this->setAllYes($command, false);
 
         $result = $command->runHandle([
@@ -59,7 +60,7 @@ class SelfupgradeCommandTest extends \Codeception\TestCase\Test
     public function testHandlePreflightReportAbortsOnConflictWhenDeclined(): void
     {
         $command = new TestSelfupgradeCommand();
-        [$style] = $this->injectIo($command, [false]);
+        [$style] = $this->injectIo($command, ['abort']);
         $this->setAllYes($command, false);
 
         $result = $command->runHandle([
@@ -72,6 +73,50 @@ class SelfupgradeCommandTest extends \Codeception\TestCase\Test
         self::assertStringContainsString('Adjust composer requirements', implode("\n", $style->messages));
     }
 
+    public function testHandlePreflightReportDisablesPluginsWhenRequested(): void
+    {
+        $gravFactory = Fixtures::get('grav');
+        $grav = $gravFactory();
+        $stub = new class {
+            public $disabled = [];
+            public function disablePlugin(string $slug, array $context = []): void
+            {
+                $this->disabled[] = $slug;
+            }
+        };
+        $grav['recovery'] = $stub;
+
+        $command = new TestSelfupgradeCommand();
+        [$style] = $this->injectIo($command, ['disable']);
+
+        $result = $command->runHandle([
+            'plugins_pending' => [],
+            'psr_log_conflicts' => ['foo' => ['requires' => '^1.0']],
+            'warnings' => []
+        ]);
+
+        self::assertTrue($result);
+        self::assertSame(['foo'], $stub->disabled);
+        $output = implode("\n", $style->messages);
+        self::assertStringContainsString('Continuing with conflicted plugins disabled.', $output);
+    }
+
+    public function testHandlePreflightReportContinuesWhenRequested(): void
+    {
+        $command = new TestSelfupgradeCommand();
+        [$style] = $this->injectIo($command, ['continue']);
+
+        $result = $command->runHandle([
+            'plugins_pending' => [],
+            'psr_log_conflicts' => ['foo' => ['requires' => '^1.0']],
+            'warnings' => []
+        ]);
+
+        self::assertTrue($result);
+        $output = implode("\n", $style->messages);
+        self::assertStringContainsString('Proceeding with potential psr/log incompatibilities still active.', $output);
+    }
+
     /**
      * @param TestSelfupgradeCommand $command
      * @param array<int, mixed> $responses
@@ -156,4 +201,13 @@ class SelfUpgradeMemoryStyle extends SymfonyStyle
 
         return parent::askQuestion($question);
     }
+
+    public function choice($question, array $choices, $default = null, $attempts = null, $errorMessage = 'Invalid value.')
+    {
+        if ($this->responses) {
+            return array_shift($this->responses);
+        }
+
+        return parent::choice($question, $choices, $default, $attempts, $errorMessage);
+    }
 }