diff --git a/composer.json b/composer.json
index fd892a2..635fcb7 100644
--- a/composer.json
+++ b/composer.json
@@ -24,7 +24,7 @@
         "friends-of-behat/mink-extension": "^2.2",
         "friends-of-behat/page-object-extension": "^0.3.1",
         "friends-of-behat/service-container-extension": "^1.0",
-        "phpstan/phpstan-shim": "^0.11",
+        "vimeo/psalm": "3.10.1",
         "sylius-labs/coding-standard": "^3.0",
         "symfony/browser-kit": "^4.4|^5.0",
         "symfony/framework-bundle": "^4.4|^5.0",
@@ -55,7 +55,7 @@
         ],
         "analyse": [
             "vendor/bin/ecs check --ansi --no-progress-bar src tests",
-            "vendor/bin/phpstan analyse --ansi --no-progress -c phpstan.neon -l max src"
+            "vendor/bin/psalm src --no-progress"
         ]
     },
     "extra": {
diff --git a/phpstan.neon b/phpstan.neon
deleted file mode 100644
index b282061..0000000
--- a/phpstan.neon
+++ /dev/null
@@ -1,12 +0,0 @@
-parameters:
-    reportUnmatchedIgnoredErrors: false
-
-    ignoreErrors:
-        - '/Cannot access offset 0 on callable/'
-        - '/Cannot access offset 1 on callable/'
-        - '/Cannot call method [a-zA-Z0-9]+\(\) on Symfony\\Component\\Config\\Definition\\Builder\\NodeParentInterface|null\./'
-        - '/Method FriendsOfBehat\\SymfonyExtension\\Context\\Environment\\InitializedSymfonyExtensionEnvironment::bindCallee\(\) should return callable/'
-        - '/Strict comparison using === between 0\|1 and 2 will always evaluate to false\./'
-        - '/Class Symfony\\Component\\BrowserKit\\Client not found\./'
-        - '/Class Symfony\\Component\\BrowserKit\\AbstractBrowser not found\./'
-        - '/Parameter \#1 \$client of method Behat\\Mink\\Driver\\BrowserKitDriver::__construct\(\) expects/'
diff --git a/psalm.xml b/psalm.xml
new file mode 100644
index 0000000..fe98d98
--- /dev/null
+++ b/psalm.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0"?>
+<psalm
+    totallyTyped="true"
+    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 vendor/vimeo/psalm/config.xsd"
+>
+    <projectFiles>
+        <directory name="src" />
+        <ignoreFiles>
+            <directory name="vendor" />
+        </ignoreFiles>
+    </projectFiles>
+
+    <issueHandlers>
+        <UndefinedClass>
+            <errorLevel type="suppress">
+                <referencedClass name="Symfony\Component\BrowserKit\AbstractBrowser" />
+                <referencedClass name="Symfony\Component\BrowserKit\Client" />
+            </errorLevel>
+        </UndefinedClass>
+    </issueHandlers>
+</psalm>
diff --git a/src/Context/Environment/Handler/ContextServiceEnvironmentHandler.php b/src/Context/Environment/Handler/ContextServiceEnvironmentHandler.php
index 1493794..b9db9f2 100644
--- a/src/Context/Environment/Handler/ContextServiceEnvironmentHandler.php
+++ b/src/Context/Environment/Handler/ContextServiceEnvironmentHandler.php
@@ -85,8 +85,6 @@ final class ContextServiceEnvironmentHandler implements EnvironmentHandler
     }
 
     /**
-     * @param UninitializedSymfonyExtensionEnvironment $uninitializedEnvironment
-     *
      * @throws EnvironmentIsolationException
      */
     public function isolateEnvironment(Environment $uninitializedEnvironment, $testSubject = null): Environment
@@ -174,6 +172,8 @@ final class ContextServiceEnvironmentHandler implements EnvironmentHandler
     }
 
     /**
+     * @psalm-assert UninitializedSymfonyExtensionEnvironment $uninitializedEnvironment
+     *
      * @throws EnvironmentIsolationException
      */
     private function assertEnvironmentCanBeIsolated(Environment $uninitializedEnvironment, $testSubject): void
diff --git a/src/Context/Environment/InitializedSymfonyExtensionEnvironment.php b/src/Context/Environment/InitializedSymfonyExtensionEnvironment.php
index 6527899..1aa4bf6 100644
--- a/src/Context/Environment/InitializedSymfonyExtensionEnvironment.php
+++ b/src/Context/Environment/InitializedSymfonyExtensionEnvironment.php
@@ -49,7 +49,7 @@ final class InitializedSymfonyExtensionEnvironment implements SymfonyExtensionEn
     {
         $callable = $callee->getCallable();
 
-        if ($callee->isAnInstanceMethod()) {
+        if (is_array($callable) && $callee->isAnInstanceMethod()) {
             return [$this->getContext($callable[0]), $callable[1]];
         }
 
diff --git a/src/Context/Environment/UninitializedSymfonyExtensionEnvironment.php b/src/Context/Environment/UninitializedSymfonyExtensionEnvironment.php
index f3d0626..db1504e 100644
--- a/src/Context/Environment/UninitializedSymfonyExtensionEnvironment.php
+++ b/src/Context/Environment/UninitializedSymfonyExtensionEnvironment.php
@@ -26,7 +26,7 @@ final class UninitializedSymfonyExtensionEnvironment extends StaticEnvironment i
     /** @var string[] */
     private $contexts;
 
-    /** @var ContextEnvironment|null */
+    /** @var ContextEnvironment */
     private $delegatedEnvironment;
 
     public function __construct(Suite $suite, array $contexts, ContextEnvironment $delegatedEnvironment)
diff --git a/src/Listener/KernelOrchestrator.php b/src/Listener/KernelOrchestrator.php
index 92d01b0..2fad7d7 100644
--- a/src/Listener/KernelOrchestrator.php
+++ b/src/Listener/KernelOrchestrator.php
@@ -36,6 +36,7 @@ final class KernelOrchestrator implements EventSubscriberInterface
 
     public function setUp(): void
     {
+        /** @psalm-suppress InvalidArgument Psalm complains that ContainerInterface does not match object|null */
         $this->symfonyKernel->getContainer()->set('behat.service_container', $this->behatContainer);
     }