diff --git a/.github/workflows/integrate.yaml b/.github/workflows/integrate.yaml
index a6d0fe14..287f8edc 100644
--- a/.github/workflows/integrate.yaml
+++ b/.github/workflows/integrate.yaml
@@ -9,7 +9,7 @@ on: # yamllint disable-line rule:truthy
       - "main"
 
 env:
-  COMPOSER_VERSION: "1.10.13"
+  COMPOSER_VERSION: "1.10.15"
   ERGEBNIS_BOT_NAME: "ergebnis-bot"
   PHP_EXTENSIONS: "mbstring"
   PHP_INI_VALUES: "memory_limit=-1, phar.readonly=0"
diff --git a/.github/workflows/release.yaml b/.github/workflows/release.yaml
index 4ccea4da..0b780dab 100644
--- a/.github/workflows/release.yaml
+++ b/.github/workflows/release.yaml
@@ -8,7 +8,7 @@ on: # yamllint disable-line rule:truthy
       - "**"
 
 env:
-  COMPOSER_VERSION: "1.10.13"
+  COMPOSER_VERSION: "1.10.15"
   PHP_EXTENSIONS: "mbstring"
   PHP_INI_VALUES: "memory_limit=-1, phar.readonly=0"
 
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 233d538d..d6a70a77 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -16,6 +16,10 @@ For a full diff see [`2.8.2...2.9.0`][2.8.2...2.9.0].
 
 * Updated `schema.json` ([#572]), by [@ergebnis-bot]
 
+### Fixed
+
+* Required at least `composer/composer:^1.10.15` and use `composer/composer:1.10.15` for PHAR ([#582]), by [@localheinz]
+
 ## [`2.8.2`][2.8.2]
 
 For a full diff see [`2.8.1...2.8.2`][2.8.1...2.8.2].
@@ -570,6 +574,7 @@ For a full diff see [`81bc3a8...0.1.0`][81bc3a8...0.1.0].
 [#529]: https://github.com/ergebnis/composer-normalize/pull/529
 [#554]: https://github.com/ergebnis/composer-normalize/pull/554
 [#572]: https://github.com/ergebnis/composer-normalize/pull/572
+[#582]: https://github.com/ergebnis/composer-normalize/pull/582
 
 [@core23]: https://github.com/core23
 [@dependabot]: https://github.com/dependabot
diff --git a/Makefile b/Makefile
index 3dd4d7d6..ab8e560a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,4 @@
-COMPOSER_VERSION:=1.10.13
+COMPOSER_VERSION:=1.10.15
 
 .PHONY: it
 it: coding-standards static-code-analysis tests ## Runs the coding-standards, static-code-analysis, and tests targets
diff --git a/composer.json b/composer.json
index 45f90051..0380d337 100644
--- a/composer.json
+++ b/composer.json
@@ -25,7 +25,7 @@
     "localheinz/diff": "^1.1.1"
   },
   "require-dev": {
-    "composer/composer": "^1.10.13 || ^2.0.0",
+    "composer/composer": "^1.10.15 || ^2.0.0",
     "composer/package-versions-deprecated": "^1.11.99",
     "ergebnis/license": "^1.1.0",
     "ergebnis/php-cs-fixer-config": "^2.3.0",
diff --git a/composer.lock b/composer.lock
index fe4bc490..5ac5be51 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": "f77e87f4ecc63dd736a023237816ac52",
+    "content-hash": "a74696fb90c670ef7e2e3029caced5de",
     "packages": [
         {
             "name": "ergebnis/json-normalizer",
@@ -480,16 +480,16 @@
         },
         {
             "name": "composer/composer",
-            "version": "1.10.13",
+            "version": "1.10.15",
             "source": {
                 "type": "git",
                 "url": "https://github.com/composer/composer.git",
-                "reference": "47c841ba3b2d3fc0b4b13282cf029ea18b66d78b"
+                "reference": "547c9ee73fe26c77af09a0ea16419176b1cdbd12"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/composer/composer/zipball/47c841ba3b2d3fc0b4b13282cf029ea18b66d78b",
-                "reference": "47c841ba3b2d3fc0b4b13282cf029ea18b66d78b",
+                "url": "https://api.github.com/repos/composer/composer/zipball/547c9ee73fe26c77af09a0ea16419176b1cdbd12",
+                "reference": "547c9ee73fe26c77af09a0ea16419176b1cdbd12",
                 "shasum": ""
             },
             "require": {
@@ -570,7 +570,7 @@
                     "type": "tidelift"
                 }
             ],
-            "time": "2020-09-09T09:46:34+00:00"
+            "time": "2020-10-13T13:59:09+00:00"
         },
         {
             "name": "composer/package-versions-deprecated",