diff --git a/pmd-ruleset.xml b/pmd-ruleset.xml
deleted file mode 100644
index 5e469f3..0000000
--- a/pmd-ruleset.xml
+++ /dev/null
@@ -1,76 +0,0 @@
-<?xml version="1.0"?>
-
-<ruleset name="PMD HappyCoders ruleset - Hexagonal Architecture"
-         xmlns="http://pmd.sourceforge.net/ruleset/2.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://pmd.sourceforge.net/ruleset/2.0.0 https://pmd.sourceforge.io/ruleset_2_0_0.xsd">
-
-    <description>PMD ruleset for HappyCoders.eu (relaxed for Hexagonal Architecture tutorial)</description>
-
-    <!-- Rule reference: https://pmd.github.io/pmd/pmd_rules_java.html -->
-
-    <rule ref="category/java/bestpractices.xml">
-        <exclude name="PreserveStackTrace"/>              <!-- We're using very specific exceptions like "ProductNotFoundException"; for those, the stack trace is not important. -->
-    </rule>
-
-    <rule ref="category/java/codestyle.xml">
-        <exclude name="AtLeastOneConstructor"/>           <!-- I don't think we should implement artificial default constructors. -->
-        <exclude name="CommentDefaultAccessModifier"/>    <!-- We don't comment why we make fields private, protected or public. So why should we comment on default access? -->
-        <exclude name="LocalVariableCouldBeFinal"/>       <!-- Using 'final' on local variables (in contrast to fields) has no effect on the compiler; IMO it's noise. -->
-        <exclude name="MethodArgumentCouldBeFinal"/>      <!-- Using 'final' on method arguments (in contrast to fields) has no effect on the compiler; IMO it's noise. -->
-        <exclude name="OnlyOneReturn"/>                   <!-- Outdated in times of short methods. -->
-    </rule>
-
-    <rule ref="category/java/codestyle.xml/LongVariable">
-        <properties>
-            <property name="minimum" value="65" />        <!-- Default max is 16, which is not always enough for a descriptive name; allow longer variables. -->
-        </properties>
-    </rule>
-
-    <rule ref="category/java/codestyle.xml/ShortClassName">
-        <properties>
-            <property name="minimum" value="4" />         <!-- Default minimum is 5, that wouldn't allow a class name like "Cart". -->
-        </properties>
-    </rule>
-
-    <rule ref="category/java/codestyle.xml/ShortMethodName">
-        <properties>
-            <property name="minimum" value="2" />         <!-- Default minimum is 3, that wouldn't allow a method name like "id()". -->
-        </properties>
-    </rule>
-
-    <rule ref="category/java/codestyle.xml/ShortVariable">
-        <properties>
-            <property name="minimum" value="2" />         <!-- Default minimum is 3, that wouldn't allow a variable name like "id". -->
-        </properties>
-    </rule>
-
-    <rule ref="category/java/design.xml">
-        <exclude name="LawOfDemeter"/>                    <!-- This rule also prohibits a fluent programming style. -->
-        <exclude name="LoosePackageCoupling"/>            <!-- This rule requires configuration. -->
-    </rule>
-
-    <rule ref="category/java/documentation.xml">
-        <exclude name="CommentRequired"/>                 <!-- Would require comments on all fields, public methods, and constructors. Good names are a much better documentation. -->
-        <exclude name="CommentSize"/>                     <!-- Don't limit the size of comments. -->
-    </rule>
-
-    <rule ref="category/java/errorprone.xml">
-        <exclude name="AvoidFieldNameMatchingMethodName"/><!-- I personally like using the field name also as an accessor name for final fields (like in records). -->
-        <exclude name="MissingSerialVersionUID"/>         <!-- We're not using serialization. -->
-    </rule>
-
-    <rule ref="category/java/errorprone.xml/AvoidLiteralsInIfCondition">
-        <properties>
-            <property name="ignoreMagicNumbers" value="-1,0,1,2" /><!-- Allow a few other literals than the default (-1, 0). -->
-        </properties>
-    </rule>
-
-    <rule ref="category/java/multithreading.xml">
-        <exclude name="UseConcurrentHashMap"/>            <!-- I prefer to decide on my own. -->
-    </rule>
-
-    <rule ref="category/java/performance.xml"/>
-    <rule ref="category/java/security.xml"/>
-
-</ruleset>
diff --git a/pom.xml b/pom.xml
index d43685b..d1b2378 100644
--- a/pom.xml
+++ b/pom.xml
@@ -232,9 +232,6 @@
                         <version>3.21.0</version>
                         <configuration>
                             <targetJdk>19</targetJdk>
-                            <rulesets>
-                                <ruleset>pmd-ruleset.xml</ruleset>
-                            </rulesets>
                         </configuration>
                         <dependencies>
                             <dependency>