diff --git a/composer.json b/composer.json
index cad5b67..85f0bc9 100644
--- a/composer.json
+++ b/composer.json
@@ -1,6 +1,7 @@
 {
     "require-dev": {
-        "psalm/phar": "^4.10"
+        "psalm/phar": "^4.10",
+        "christophwurst/nextcloud": "^21.0"
     },
     "scripts": {
         "lint": "find . -name \\*.php -not -path './vendor/*' -print0 | xargs -0 -n1 php -l",
diff --git a/psalm.xml b/psalm.xml
new file mode 100644
index 0000000..1c2bb11
--- /dev/null
+++ b/psalm.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0"?>
+<psalm
+	errorLevel="4"
+	resolveFromConfigFile="true"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xmlns="https://getpsalm.org/schema/config"
+	xsi:schemaLocation="https://getpsalm.org/schema/config"
+>
+	<projectFiles>
+		<directory name="lib" />
+		<ignoreFiles>
+			<directory name="vendor" />
+		</ignoreFiles>
+	</projectFiles>
+	<extraFiles>
+		<directory name="vendor" />
+	</extraFiles>
+	<issueHandlers>
+		<UndefinedClass>
+			<errorLevel type="suppress">
+				<referencedClass name="OC" />
+				<referencedClass name="OC_App" />
+				<referencedClass name="OC_Util" />
+			</errorLevel>
+		</UndefinedClass>
+		<UndefinedDocblockClass>
+			<errorLevel type="suppress">
+				<referencedClass name="Doctrine\DBAL\Driver\Statement" />
+				<referencedClass name="Doctrine\DBAL\Schema\Schema" />
+				<referencedClass name="Doctrine\DBAL\Schema\SchemaException" />
+				<referencedClass name="Doctrine\DBAL\Schema\Table" />
+			</errorLevel>
+		</UndefinedDocblockClass>
+	</issueHandlers>
+</psalm>