diff --git a/CHANGELOG.md b/CHANGELOG.md
index ae684cc..fb2abd3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ### Removed
 
 ### Fixed
+- Explicitly require Prophecy (#511)
 
 ## 2.0.0
 
diff --git a/composer.json b/composer.json
index d18fcd1..a70c91d 100644
--- a/composer.json
+++ b/composer.json
@@ -41,6 +41,7 @@
 		"helmich/typo3-typoscript-lint": "^2.5.2",
 		"jangregor/phpstan-prophecy": "^1.0.0",
 		"php-coveralls/php-coveralls": "^2.5.2",
+		"phpspec/prophecy": "^1.15.0",
 		"phpstan/extension-installer": "^1.1.0",
 		"phpstan/phpstan": "^1.8.2",
 		"phpstan/phpstan-phpunit": "^1.1.1",