diff --git a/psalm.xml b/psalm.xml
index 0bb2d4f..6c46721 100644
--- a/psalm.xml
+++ b/psalm.xml
@@ -12,11 +12,5 @@
         <directory name="src"/>
         <directory name="tests"/>
         <directory name="benchmark"/>
-        <ignoreFiles>
-            <directory name="vendor"/>
-        </ignoreFiles>
     </projectFiles>
-    <plugins>
-        <pluginClass class="Psalm\PhpUnitPlugin\Plugin"/>
-    </plugins>
 </psalm>
diff --git a/src/Numerics/Matrix.php b/src/Numerics/Matrix.php
index f3ff6ea..533227f 100644
--- a/src/Numerics/Matrix.php
+++ b/src/Numerics/Matrix.php
@@ -8,7 +8,7 @@ use Exception;
 
 class Matrix
 {
-    public const ERROR_TOLERANCE = 0.0000000001;
+    public const float ERROR_TOLERANCE = 0.0000000001;
 
     /**
      * @param array<int,array<int,float>> $matrixRowData
diff --git a/src/SkillCalculator.php b/src/SkillCalculator.php
index 905257a..a5f049e 100644
--- a/src/SkillCalculator.php
+++ b/src/SkillCalculator.php
@@ -11,11 +11,11 @@ use Exception;
  */
 abstract class SkillCalculator
 {
-    public const NONE = 0x00;
+    public const int NONE = 0x00;
 
-    public const PARTIAL_PLAY = 0x01;
+    public const int PARTIAL_PLAY = 0x01;
 
-    public const PARTIAL_UPDATE = 0x02;
+    public const int PARTIAL_UPDATE = 0x02;
 
     protected function __construct(
         private readonly int $supportedOptions,