diff --git a/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php b/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php
index c07f753e6..4c1c310cf 100644
--- a/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php
+++ b/src/Psalm/Internal/Analyzer/ProjectAnalyzer.php
@@ -256,6 +256,8 @@ class ProjectAnalyzer
         $this->threads = $threads;
         $this->config = $config;
 
+        $this->clearCacheDirectoryIfConfigOrComposerLockfileChanged();
+
         $this->codebase = new Codebase(
             $config,
             $providers,
@@ -281,17 +283,38 @@ class ProjectAnalyzer
             $this->addProjectFile($file_path);
         }
 
-        if ($this->project_cache_provider && $this->project_cache_provider->hasLockfileChanged()) {
+        self::$instance = $this;
+    }
+
+    private function clearCacheDirectoryIfConfigOrComposerLockfileChanged() : void
+    {
+        if ($this->project_cache_provider
+            && $this->project_cache_provider->hasLockfileChanged()
+        ) {
             $this->progress->debug(
                 'Composer lockfile change detected, clearing cache' . "\n"
             );
 
-            Config::removeCacheDirectory($config->getCacheDirectory());
+            Config::removeCacheDirectory($this->config->getCacheDirectory());
+
+            if ($this->file_reference_provider->cache) {
+                $this->file_reference_provider->cache->hasConfigChanged();
+            }
 
             $this->project_cache_provider->updateComposerLockHash();
-        }
+        } elseif ($this->file_reference_provider->cache
+            && $this->file_reference_provider->cache->hasConfigChanged()
+        ) {
+            $this->progress->debug(
+                'Config change detected, clearing cache' . "\n"
+            );
 
-        self::$instance = $this;
+            Config::removeCacheDirectory($this->config->getCacheDirectory());
+
+            if ($this->project_cache_provider) {
+                $this->project_cache_provider->hasLockfileChanged();
+            }
+        }
     }
 
     /**
diff --git a/src/Psalm/Internal/Provider/FileReferenceCacheProvider.php b/src/Psalm/Internal/Provider/FileReferenceCacheProvider.php
index 214bf4aa3..9ecf81075 100644
--- a/src/Psalm/Internal/Provider/FileReferenceCacheProvider.php
+++ b/src/Psalm/Internal/Provider/FileReferenceCacheProvider.php
@@ -41,16 +41,16 @@ class FileReferenceCacheProvider
      */
     private $config;
 
-    /**
-     * @var bool
-     */
-    public $config_changed;
-
     public function __construct(Config $config)
     {
         $this->config = $config;
-        $this->config_changed = $config->hash !== $this->getConfigHashCache();
-        $this->setConfigHashCache($config->hash);
+    }
+
+    public function hasConfigChanged() : bool
+    {
+        $has_changed = $this->config->hash !== $this->getConfigHashCache();
+        $this->setConfigHashCache($this->config->hash);
+        return $has_changed;
     }
 
     /**
@@ -62,7 +62,7 @@ class FileReferenceCacheProvider
     {
         $cache_directory = $this->config->getCacheDirectory();
 
-        if (!$cache_directory || $this->config_changed) {
+        if (!$cache_directory) {
             return null;
         }
 
@@ -90,7 +90,7 @@ class FileReferenceCacheProvider
     {
         $cache_directory = $this->config->getCacheDirectory();
 
-        if (!$cache_directory || $this->config_changed) {
+        if (!$cache_directory) {
             return null;
         }
 
@@ -549,7 +549,6 @@ class FileReferenceCacheProvider
 
         if ($cache_directory
             && file_exists($analyzed_methods_cache_location)
-            && !$this->config_changed
         ) {
             /** @var array<string, array<string, int>> */
             return unserialize(file_get_contents($analyzed_methods_cache_location));
@@ -590,7 +589,6 @@ class FileReferenceCacheProvider
 
         if ($cache_directory
             && file_exists($file_maps_cache_location)
-            && !$this->config_changed
         ) {
             /**
              * @var array<string, FileMapType>
@@ -633,7 +631,6 @@ class FileReferenceCacheProvider
 
         if ($cache_directory
             && file_exists($type_coverage_cache_location)
-            && !$this->config_changed
         ) {
             /** @var array<string, array{int, int}> */
             $type_coverage_cache = unserialize(file_get_contents($type_coverage_cache_location));
@@ -676,7 +673,7 @@ class FileReferenceCacheProvider
             && file_exists($config_hash_cache_location)
         ) {
             /** @var string */
-            $file_maps_cache = unserialize(file_get_contents($config_hash_cache_location));
+            $file_maps_cache = file_get_contents($config_hash_cache_location);
 
             return $file_maps_cache;
         }
@@ -700,7 +697,7 @@ class FileReferenceCacheProvider
 
             file_put_contents(
                 $config_hash_cache_location,
-                serialize($hash)
+                $hash
             );
         }
     }
diff --git a/tests/EndToEnd/PsalmEndToEndTest.php b/tests/EndToEnd/PsalmEndToEndTest.php
index eeab63561..a25e5dbd3 100644
--- a/tests/EndToEnd/PsalmEndToEndTest.php
+++ b/tests/EndToEnd/PsalmEndToEndTest.php
@@ -48,6 +48,7 @@ class PsalmEndToEndTest extends TestCase
         mkdir(self::$tmpDir . '/src');
 
         copy(__DIR__ . '/../fixtures/DummyProjectWithErrors/composer.json', self::$tmpDir . '/composer.json');
+        copy(__DIR__ . '/../fixtures/DummyProjectWithErrors/composer.lock', self::$tmpDir . '/composer.lock');
 
         (new Process(['composer', 'install', '--no-plugins'], self::$tmpDir))->mustRun();
     }
@@ -65,6 +66,14 @@ class PsalmEndToEndTest extends TestCase
         parent::setUp();
     }
 
+    public function tearDown(): void
+    {
+        if (\file_exists(self::$tmpDir . '/cache')) {
+            self::recursiveRemoveDirectory(self::$tmpDir . '/cache');
+        }
+        parent::tearDown();
+    }
+
     public function testHelpReturnsMessage(): void
     {
         $this->assertStringContainsString('Usage:', $this->runPsalm(['--help'], self::$tmpDir)['STDOUT']);
@@ -110,6 +119,27 @@ class PsalmEndToEndTest extends TestCase
         $this->assertSame(1, $result['CODE']);
     }
 
+    public function testPsalmDiff(): void
+    {
+        $this->runPsalmInit(1);
+        $result = $this->runPsalm(['--diff', '-m'], self::$tmpDir, true);
+        $this->assertStringContainsString('InvalidReturnType', $result['STDOUT']);
+        $this->assertStringContainsString('InvalidReturnStatement', $result['STDOUT']);
+        $this->assertStringContainsString('2 errors', $result['STDOUT']);
+        $this->assertStringContainsString('E', $result['STDERR']);
+
+        $this->assertSame(1, $result['CODE']);
+
+        $result = $this->runPsalm(['--diff', '-m'], self::$tmpDir, true);
+
+        $this->assertStringContainsString('InvalidReturnType', $result['STDOUT']);
+        $this->assertStringContainsString('InvalidReturnStatement', $result['STDOUT']);
+        $this->assertStringContainsString('2 errors', $result['STDOUT']);
+        $this->assertStringNotContainsString('E', $result['STDERR']);
+
+        $this->assertSame(1, $result['CODE']);
+    }
+
     public function testLegacyConfigWithoutresolveFromConfigFile(): void
     {
         $this->runPsalmInit(1);
@@ -137,7 +167,18 @@ class PsalmEndToEndTest extends TestCase
             $args[] = 'src';
             $args[] = (string) $level;
         }
-        return $this->runPsalm($args, self::$tmpDir, false, false);
+
+        $ret = $this->runPsalm($args, self::$tmpDir, false, false);
+
+        $psalm_config_contents = file_get_contents(self::$tmpDir . '/psalm.xml');
+        $psalm_config_contents = \str_replace(
+            'errorLevel="1"',
+            'errorLevel="1" cacheDirectory="' . self::$tmpDir . '/cache"',
+            $psalm_config_contents
+        );
+        file_put_contents(self::$tmpDir . '/psalm.xml', $psalm_config_contents);
+
+        return $ret;
     }
 
     /** from comment by itay at itgoldman dot com at
diff --git a/tests/Internal/Provider/FakeFileReferenceCacheProvider.php b/tests/Internal/Provider/FakeFileReferenceCacheProvider.php
index f02145129..a749c800f 100644
--- a/tests/Internal/Provider/FakeFileReferenceCacheProvider.php
+++ b/tests/Internal/Provider/FakeFileReferenceCacheProvider.php
@@ -57,7 +57,6 @@ class FakeFileReferenceCacheProvider extends \Psalm\Internal\Provider\FileRefere
 
     public function __construct()
     {
-        $this->config_changed = false;
     }
 
     /**
diff --git a/tests/fixtures/DummyProjectWithErrors/composer.json b/tests/fixtures/DummyProjectWithErrors/composer.json
index 3f46bb5cf..0e3aa839f 100644
--- a/tests/fixtures/DummyProjectWithErrors/composer.json
+++ b/tests/fixtures/DummyProjectWithErrors/composer.json
@@ -2,7 +2,9 @@
     "name": "acme/sample-project",
     "description": "A sample project to be used when testing Psalm",
     "type": "project",
-    "require": {},
+    "require": {
+        "vimeo/psalm": "^3.11"
+    },
     "autoload": {
         "psr-4": {
             "Acme\\SampleProject\\": "src/"
diff --git a/tests/fixtures/DummyProjectWithErrors/composer.lock b/tests/fixtures/DummyProjectWithErrors/composer.lock
new file mode 100644
index 000000000..136dc87ef
--- /dev/null
+++ b/tests/fixtures/DummyProjectWithErrors/composer.lock
@@ -0,0 +1,1658 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "c0ce39a6f253ebd491227d76ea75119d",
+    "packages": [
+        {
+            "name": "amphp/amp",
+            "version": "v2.4.4",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/amphp/amp.git",
+                "reference": "1e58d53e4af390efc7813e36cd215bd82cba4b06"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/amphp/amp/zipball/1e58d53e4af390efc7813e36cd215bd82cba4b06",
+                "reference": "1e58d53e4af390efc7813e36cd215bd82cba4b06",
+                "shasum": ""
+            },
+            "require": {
+                "php": ">=7"
+            },
+            "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1",
+                "ext-json": "*",
+                "jetbrains/phpstorm-stubs": "^2019.3",
+                "phpunit/phpunit": "^6.0.9 | ^7",
+                "react/promise": "^2",
+                "vimeo/psalm": "^3.11@dev"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "2.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Amp\\": "lib"
+                },
+                "files": [
+                    "lib/functions.php",
+                    "lib/Internal/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Daniel Lowrey",
+                    "email": "rdlowrey@php.net"
+                },
+                {
+                    "name": "Aaron Piotrowski",
+                    "email": "aaron@trowski.com"
+                },
+                {
+                    "name": "Bob Weinand",
+                    "email": "bobwei9@hotmail.com"
+                },
+                {
+                    "name": "Niklas Keller",
+                    "email": "me@kelunik.com"
+                }
+            ],
+            "description": "A non-blocking concurrency framework for PHP applications.",
+            "homepage": "http://amphp.org/amp",
+            "keywords": [
+                "async",
+                "asynchronous",
+                "awaitable",
+                "concurrency",
+                "event",
+                "event-loop",
+                "future",
+                "non-blocking",
+                "promise"
+            ],
+            "time": "2020-04-30T04:54:50+00:00"
+        },
+        {
+            "name": "amphp/byte-stream",
+            "version": "v1.7.3",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/amphp/byte-stream.git",
+                "reference": "b867505edb79dda8f253ca3c3a2bbadae4b16592"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/amphp/byte-stream/zipball/b867505edb79dda8f253ca3c3a2bbadae4b16592",
+                "reference": "b867505edb79dda8f253ca3c3a2bbadae4b16592",
+                "shasum": ""
+            },
+            "require": {
+                "amphp/amp": "^2"
+            },
+            "require-dev": {
+                "amphp/php-cs-fixer-config": "dev-master",
+                "amphp/phpunit-util": "^1",
+                "friendsofphp/php-cs-fixer": "^2.3",
+                "jetbrains/phpstorm-stubs": "^2019.3",
+                "phpunit/phpunit": "^6 || ^7 || ^8",
+                "vimeo/psalm": "^3.9@dev"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Amp\\ByteStream\\": "lib"
+                },
+                "files": [
+                    "lib/functions.php"
+                ]
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Aaron Piotrowski",
+                    "email": "aaron@trowski.com"
+                },
+                {
+                    "name": "Niklas Keller",
+                    "email": "me@kelunik.com"
+                }
+            ],
+            "description": "A stream abstraction to make working with non-blocking I/O simple.",
+            "homepage": "http://amphp.org/byte-stream",
+            "keywords": [
+                "amp",
+                "amphp",
+                "async",
+                "io",
+                "non-blocking",
+                "stream"
+            ],
+            "time": "2020-04-04T16:56:54+00:00"
+        },
+        {
+            "name": "composer/semver",
+            "version": "1.5.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/semver.git",
+                "reference": "c6bea70230ef4dd483e6bbcab6005f682ed3a8de"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/semver/zipball/c6bea70230ef4dd483e6bbcab6005f682ed3a8de",
+                "reference": "c6bea70230ef4dd483e6bbcab6005f682ed3a8de",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.5 || ^5.0.5"
+            },
+            "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.x-dev"
+                }
+            },
+            "autoload": {
+                "psr-4": {
+                    "Composer\\Semver\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "Nils Adermann",
+                    "email": "naderman@naderman.de",
+                    "homepage": "http://www.naderman.de"
+                },
+                {
+                    "name": "Jordi Boggiano",
+                    "email": "j.boggiano@seld.be",
+                    "homepage": "http://seld.be"
+                },
+                {
+                    "name": "Rob Bast",
+                    "email": "rob.bast@gmail.com",
+                    "homepage": "http://robbast.nl"
+                }
+            ],
+            "description": "Semver library that offers utilities, version constraint parsing and validation.",
+            "keywords": [
+                "semantic",
+                "semver",
+                "validation",
+                "versioning"
+            ],
+            "time": "2020-01-13T12:06:48+00:00"
+        },
+        {
+            "name": "composer/xdebug-handler",
+            "version": "1.4.2",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/composer/xdebug-handler.git",
+                "reference": "fa2aaf99e2087f013a14f7432c1cd2dd7d8f1f51"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/composer/xdebug-handler/zipball/fa2aaf99e2087f013a14f7432c1cd2dd7d8f1f51",
+                "reference": "fa2aaf99e2087f013a14f7432c1cd2dd7d8f1f51",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^5.3.2 || ^7.0 || ^8.0",
+                "psr/log": "^1.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^4.8.35 || ^5.7 || 6.5 - 8"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "Composer\\XdebugHandler\\": "src"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "MIT"
+            ],
+            "authors": [
+                {
+                    "name": "John Stevenson",
+                    "email": "john-stevenson@blueyonder.co.uk"
+                }
+            ],
+            "description": "Restarts a process without Xdebug.",
+            "keywords": [
+                "Xdebug",
+                "performance"
+            ],
+            "time": "2020-06-04T11:16:35+00:00"
+        },
+        {
+            "name": "felixfbecker/advanced-json-rpc",
+            "version": "v3.1.1",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/felixfbecker/php-advanced-json-rpc.git",
+                "reference": "0ed363f8de17d284d479ec813c9ad3f6834b5c40"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/felixfbecker/php-advanced-json-rpc/zipball/0ed363f8de17d284d479ec813c9ad3f6834b5c40",
+                "reference": "0ed363f8de17d284d479ec813c9ad3f6834b5c40",
+                "shasum": ""
+            },
+            "require": {
+                "netresearch/jsonmapper": "^1.0 || ^2.0",
+                "php": ">=7.0",
+                "phpdocumentor/reflection-docblock": "^4.0.0 || ^5.0.0"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "^6.0.0"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "AdvancedJsonRpc\\": "lib/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "ISC"
+            ],
+            "authors": [
+                {
+                    "name": "Felix Becker",
+                    "email": "felix.b@outlook.com"
+                }
+            ],
+            "description": "A more advanced JSONRPC implementation",
+            "time": "2020-03-11T15:21:41+00:00"
+        },
+        {
+            "name": "felixfbecker/language-server-protocol",
+            "version": "v1.4.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/felixfbecker/php-language-server-protocol.git",
+                "reference": "378801f6139bb74ac215d81cca1272af61df9a9f"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/felixfbecker/php-language-server-protocol/zipball/378801f6139bb74ac215d81cca1272af61df9a9f",
+                "reference": "378801f6139bb74ac215d81cca1272af61df9a9f",
+                "shasum": ""
+            },
+            "require": {
+                "php": "^7.0"
+            },
+            "require-dev": {
+                "phpstan/phpstan": "*",
+                "phpunit/phpunit": "^6.3",
+                "squizlabs/php_codesniffer": "^3.1"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-4": {
+                    "LanguageServerProtocol\\": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "ISC"
+            ],
+            "authors": [
+                {
+                    "name": "Felix Becker",
+                    "email": "felix.b@outlook.com"
+                }
+            ],
+            "description": "PHP classes for the Language Server Protocol",
+            "keywords": [
+                "language",
+                "microsoft",
+                "php",
+                "server"
+            ],
+            "time": "2019-06-23T21:03:50+00:00"
+        },
+        {
+            "name": "netresearch/jsonmapper",
+            "version": "v2.1.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/cweiske/jsonmapper.git",
+                "reference": "e0f1e33a71587aca81be5cffbb9746510e1fe04e"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/cweiske/jsonmapper/zipball/e0f1e33a71587aca81be5cffbb9746510e1fe04e",
+                "reference": "e0f1e33a71587aca81be5cffbb9746510e1fe04e",
+                "shasum": ""
+            },
+            "require": {
+                "ext-json": "*",
+                "ext-pcre": "*",
+                "ext-reflection": "*",
+                "ext-spl": "*",
+                "php": ">=5.6"
+            },
+            "require-dev": {
+                "phpunit/phpunit": "~4.8.35 || ~5.7 || ~6.4 || ~7.0",
+                "squizlabs/php_codesniffer": "~3.5"
+            },
+            "type": "library",
+            "autoload": {
+                "psr-0": {
+                    "JsonMapper": "src/"
+                }
+            },
+            "notification-url": "https://packagist.org/downloads/",
+            "license": [
+                "OSL-3.0"
+            ],
+            "authors": [
+                {
+                    "name": "Christian Weiske",
+                    "email": "cweiske@cweiske.de",
+                    "homepage": "http://github.com/cweiske/jsonmapper/",
+                    "role": "Developer"
+                }
+            ],
+            "description": "Map nested JSON structures onto PHP classes",
+            "time": "2020-04-16T18:48:43+00:00"
+        },
+        {
+            "name": "nikic/php-parser",
+            "version": "v4.5.0",
+            "source": {
+                "type": "git",
+                "url": "https://github.com/nikic/PHP-Parser.git",
+                "reference": "53c2753d756f5adb586dca79c2ec0e2654dd9463"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://api.github.com/repos/nikic/PHP-Parser/zipball/53c2753d756f5adb586dca79c2ec0e2654dd9463",
+                "reference": "53c2753d756f5adb586dca79c2ec0e2654dd9463",
+                "shasum": ""
+            },
+            "require": {
+                "ext-tokenizer": "*",
+                "php": ">=7.0"
+            },
+            "require-dev": {
+                "ircmaxell/php-yacc": "0.0.5",
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