diff --git a/composer.json b/composer.json
index 9b082b3..45f4c24 100644
--- a/composer.json
+++ b/composer.json
@@ -15,10 +15,10 @@
         "php": ">=8.0"
     },
     "require-dev": {
-        "phpstan/phpstan": "^1.4",
-        "phpunit/phpunit": "^9.5.0",
-        "symfony/phpunit-bridge": "^6.3",
-        "symfony/var-dumper": "^5.4|^6.0"
+        "phpstan/phpstan": "^2.1.31",
+        "phpunit/phpunit": "^9.6.29",
+        "symfony/phpunit-bridge": "^6.4|^7.0",
+        "symfony/var-dumper": "^5.4|^6.0|^7.0|^8.0"
     },
     "config": {
         "preferred-install": "dist",
diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
new file mode 100644
index 0000000..231dfe1
--- /dev/null
+++ b/phpstan-baseline.neon
@@ -0,0 +1,19 @@
+parameters:
+	ignoreErrors:
+		-
+			message: '#^@readonly property Zenstruck\\Bytes\:\:\$system is assigned outside of the constructor\.$#'
+			identifier: property.readOnlyByPhpDocAssignNotInConstructor
+			count: 2
+			path: src/Bytes.php
+
+		-
+			message: '#^@readonly property Zenstruck\\Bytes\:\:\$units is assigned outside of the constructor\.$#'
+			identifier: property.readOnlyByPhpDocAssignNotInConstructor
+			count: 2
+			path: src/Bytes.php
+
+		-
+			message: '#^@readonly property cannot have a default value\.$#'
+			identifier: property.readOnlyByPhpDocDefaultValue
+			count: 2
+			path: src/Bytes.php
diff --git a/phpstan.neon b/phpstan.neon
index f6c9ddc..b6d062c 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,3 +1,6 @@
+includes:
+    - phpstan-baseline.neon
+
 parameters:
     level: 8
     treatPhpDocTypesAsCertain: false