diff --git a/.github/workflows/static.yml b/.github/workflows/static.yml
index 92e84f9b..b7778798 100644
--- a/.github/workflows/static.yml
+++ b/.github/workflows/static.yml
@@ -36,6 +36,9 @@ jobs:
           - ubuntu-latest
 
         php:
+          - '8.0'
+          - '8.1'
+          - '8.2'
           - '8.3'
 
     steps:
@@ -68,4 +71,9 @@ jobs:
         run: composer update --no-interaction --no-progress --optimize-autoloader --ansi
 
       - name: Static analysis.
+        if: ${{ matrix.php != '8.0' }}
         run: vendor/bin/psalm --config=${{ inputs.psalm-config }} --shepherd --stats --output-format=github --php-version=${{ matrix.php }}
+
+      - name: Static analysis.
+        if: ${{ matrix.php == '8.0' }}
+        run: vendor/bin/psalm --config=psalm4.xml --shepherd --stats --output-format=github --php-version=${{ matrix.php }}
diff --git a/psalm4.xml b/psalm4.xml
new file mode 100644
index 00000000..10d319ae
--- /dev/null
+++ b/psalm4.xml
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<psalm
+    errorLevel="1"
+    findUnusedBaselineEntry="true"
+    findUnusedCode="false"
+    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>
+        <MixedAssignment errorLevel="suppress"/>
+    </issueHandlers>
+</psalm>