diff --git a/pom.xml b/pom.xml
index 6d92ff7..9c1e68d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,12 +4,6 @@
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
-    <parent>
-        <groupId>net.kemitix</groupId>
-        <artifactId>kemitix-parent</artifactId>
-        <version>5.1.0</version>
-        <relativePath/>
-    </parent>
     <groupId>net.kemitix</groupId>
     <artifactId>mon</artifactId>
     <version>0.7.0-SNAPSHOT</version>
@@ -21,10 +15,10 @@
         <lombok.version>1.18.0</lombok.version>
         <tiles-maven-plugin.version>2.11</tiles-maven-plugin.version>
         <kemitix-tiles.version>0.8.1</kemitix-tiles.version>
-        <maven-surefire-plugin.version>2.20.1</maven-surefire-plugin.version>
-        <maven-failsafe-plugin.version>2.20.1</maven-failsafe-plugin.version>
+        <maven-surefire-plugin.version>2.22.0</maven-surefire-plugin.version>
+        <maven-failsafe-plugin.version>2.22.0</maven-failsafe-plugin.version>
         <digraph-dependency.basePackage>net.kemitix.mon</digraph-dependency.basePackage>
-        <kemitix-checkstyle.version>4.0.1</kemitix-checkstyle.version>
+        <kemitix-checkstyle.version>4.1.1</kemitix-checkstyle.version>
     </properties>
 
     <dependencies>
diff --git a/src/test/java/net/kemitix/mon/MaybeTest.java b/src/test/java/net/kemitix/mon/MaybeTest.java
index ba68b3c..f8e7e33 100644
--- a/src/test/java/net/kemitix/mon/MaybeTest.java
+++ b/src/test/java/net/kemitix/mon/MaybeTest.java
@@ -24,7 +24,7 @@ public class MaybeTest {
     @Test
     public void justMustBeNonNull() {
         assertThatNullPointerException().isThrownBy(() -> just(null))
-                                        .withMessage("value");
+                                        .withMessageContaining("value");
     }
 
     @Test
diff --git a/src/test/java/net/kemitix/mon/MonTest.java b/src/test/java/net/kemitix/mon/MonTest.java
index abe6a55..e54f9f9 100644
--- a/src/test/java/net/kemitix/mon/MonTest.java
+++ b/src/test/java/net/kemitix/mon/MonTest.java
@@ -97,7 +97,7 @@ public class MonTest {
     public void factoryRequiresValidator() {
         assertThatNullPointerException().isThrownBy(
                 () -> Mon.factory(null, Optional::of, Optional::empty))
-                .withMessage("validator");
+                .withMessageContaining("validator");
     }
 
     @Test
@@ -105,7 +105,7 @@ public class MonTest {
     public void factoryRequiresOnValid() {
         assertThatNullPointerException().isThrownBy(
                 () -> Mon.factory(v -> true, null, Optional::empty))
-                .withMessage("onValid");
+                .withMessageContaining("onValid");
     }
 
     @Test
@@ -113,7 +113,7 @@ public class MonTest {
     public void factoryRequiresOnInvalid() {
         assertThatNullPointerException().isThrownBy(
                 () -> Mon.factory(v -> true, Optional::of, null))
-                .withMessage("onInvalid");
+                .withMessageContaining("onInvalid");
     }
 
     @Test