diff --git a/README.md b/README.md
index abffbb0..ecde479 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ Inputs
 
 The following configuration options are available:
 
-+ `version` The version of PHPStan to use e.g. `9` or `9.5.0` (default: latest)
++ `version` The version of PHPStan to use e.g. `9`, `9.5.0`, `latest` or `composer` (default: `composer` will use the version in your `vendor/bin` directory)
 + `php_version` The version of PHP to use e.g. `7.4` (default: latest)
 + `php_extensions` Space-separated list of extensions using [php-build][php-build] e.g. `xdebug mbstring` (default: N/A)
 + `vendored_phpstan_path` The path to a phar file already present on the runner (default: N/A)
@@ -100,13 +100,12 @@ PHP and PHPStan versions
 
 It's possible to run any version of PHPStan under any version of PHP, with any PHP extensions you require. This is configured with the following inputs:
 
-+ `version` - the version number of PHPStan to run e.g. `0.12.63` (default: latest)
-+ `php_version` - the version number of PHP to use e.g. `7.4` (default: latest)
++ `version` - the version number of PHPStan to run e.g. `1.10.14` (default: `composer`)
++ `php_version` - the version number of PHP to use e.g. `8.1` (default: `latest`)
 + `php_extensions` - a space-separated list of extensions to install using [php-build][php-build] e.g. `xdebug mbstring` (default: N/A)
 
 If you require a specific version combination that is not compatible with Github Actions for some reason, please make a request in the [Github issue tracker][issues].
 
-
 ***
 
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diff --git a/action.yml b/action.yml
index fdf3e66..7019530 100644
--- a/action.yml
+++ b/action.yml
@@ -4,7 +4,7 @@ description: PHP Static Analysis in Github Actions.
 inputs:
   version:
     description: What version of PHPStan to use
-    default: latest
+    default: composer
     required: false
 
   php_version:
diff --git a/phpstan-action.bash b/phpstan-action.bash
index fd0d95d..542e013 100755
--- a/phpstan-action.bash
+++ b/phpstan-action.bash
@@ -4,6 +4,18 @@ github_action_path=$(dirname "$0")
 docker_tag=$(cat ./docker_tag)
 echo "Docker tag: $docker_tag" >> output.log 2>&1
 
+if [ "$ACTION_VERSION" = "composer" ]
+then
+	VENDOR_BIN="vendor/bin/phpstan"
+	if test -f "$VENDOR_BIN"
+	then
+		ACTION_PHPSTAN_PATH="$VENDOR_BIN"
+	else
+		echo "Trying to use version installed by Composer, but there is no file at $ACTION_PHPSTAN_PATH"
+		exit 1
+	fi
+fi
+
 if [ -z "$ACTION_PHPSTAN_PATH" ]
 then
 	phar_url="https://www.getrelease.download/phpstan/phpstan/$ACTION_VERSION/phar"
@@ -94,6 +106,7 @@ echo "Command: " "${command_string[@]}" >> output.log 2>&1
 
 docker run --rm \
 	--volume "$phar_path":/usr/local/bin/phpstan \
+	--volume "${GITHUB_WORKSPACE}/vendor/phpstan:/usr/local/phpstan" \
 	--volume "${GITHUB_WORKSPACE}":/app \
 	--workdir /app \
 	--env-file ./DOCKER_ENV \