diff --git a/composer.json b/composer.json
index 1c05cca5..cd5e687e 100644
--- a/composer.json
+++ b/composer.json
@@ -30,7 +30,7 @@
     "ergebnis/php-cs-fixer-config": "^2.10.0",
     "ergebnis/phpstan-rules": "~0.15.2",
     "ergebnis/test-util": "^1.4.0",
-    "phpstan/extension-installer": "^1.0.5",
+    "phpstan/extension-installer": "^1.1.0",
     "phpstan/phpstan": "~0.12.64",
     "phpstan/phpstan-deprecation-rules": "~0.12.6",
     "phpstan/phpstan-phpunit": "~0.12.17",
diff --git a/composer.lock b/composer.lock
index ed43d350..601782c3 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "a23d3b1102f3f1a09b692d880f233ad9",
+    "content-hash": "31dab3caf69b31a95b3fcdbe01683066",
     "packages": [
         {
             "name": "ergebnis/json-normalizer",
@@ -2403,16 +2403,16 @@
         },
         {
             "name": "phpstan/extension-installer",
-            "version": "1.0.5",
+            "version": "1.1.0",
             "source": {
                 "type": "git",
                 "url": "https://github.com/phpstan/extension-installer.git",
-                "reference": "5c2da3846819f951385cb6a25d3277051481c48a"
+                "reference": "66c7adc9dfa38b6b5838a9fb728b68a7d8348051"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/phpstan/extension-installer/zipball/5c2da3846819f951385cb6a25d3277051481c48a",
-                "reference": "5c2da3846819f951385cb6a25d3277051481c48a",
+                "url": "https://api.github.com/repos/phpstan/extension-installer/zipball/66c7adc9dfa38b6b5838a9fb728b68a7d8348051",
+                "reference": "66c7adc9dfa38b6b5838a9fb728b68a7d8348051",
                 "shasum": ""
             },
             "require": {
@@ -2422,13 +2422,9 @@
             },
             "require-dev": {
                 "composer/composer": "^1.8",
-                "consistence/coding-standard": "^3.8",
-                "dealerdirect/phpcodesniffer-composer-installer": "^0.7.0",
-                "ergebnis/composer-normalize": "^2.0.2",
-                "phing/phing": "^2.16",
+                "phing/phing": "^2.16.3",
                 "php-parallel-lint/php-parallel-lint": "^1.2.0",
-                "phpstan/phpstan-strict-rules": "^0.11",
-                "slevomat/coding-standard": "^5.0.4"
+                "phpstan/phpstan-strict-rules": "^0.11 || ^0.12"
             },
             "type": "composer-plugin",
             "extra": {
@@ -2446,9 +2442,9 @@
             "description": "Composer plugin for automatic installation of PHPStan extensions",
             "support": {
                 "issues": "https://github.com/phpstan/extension-installer/issues",
-                "source": "https://github.com/phpstan/extension-installer/tree/1.0.5"
+                "source": "https://github.com/phpstan/extension-installer/tree/1.1.0"
             },
-            "time": "2020-08-30T12:06:42+00:00"
+            "time": "2020-12-13T13:06:13+00:00"
         },
         {
             "name": "phpstan/phpstan",