diff --git a/build.gradle b/build.gradle
index dad5682f..db9d6ae2 100644
--- a/build.gradle
+++ b/build.gradle
@@ -48,7 +48,9 @@ configure(subprojects) {
         implementation platform(libs.groovy.bom)
         implementation 'org.codehaus.groovy:groovy'
 
-        testImplementation platform(libs.spock)
+        implementation platform (libs.slf4j.bom)
+
+        testImplementation platform (libs.spock)
         testImplementation "org.spockframework:spock-core"
         testImplementation "org.spockframework:spock-junit4"
 
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
index be776d19..dee311e6 100644
--- a/gradle/libs.versions.toml
+++ b/gradle/libs.versions.toml
@@ -2,16 +2,17 @@
 groovy-version = "3.0.17"
 junit5-version = "5.10.1"
 picocli-version = "4.7.5"
+slf4j-version = "2.0.11"
 
 [libraries]
 # Use Groovy which corresponds to Gradle version (of hsc build)
 groovy-bom = { module = "org.codehaus.groovy:groovy-bom", version.ref = "groovy-version" }
 jsoup = "org.jsoup:jsoup:1.17.2"
 junit-vintage = { module = "org.junit.vintage:junit-vintage-engine", version.ref = "junit5-version" }
+mockito = "org.mockito:mockito-junit-jupiter:3.11.2"
 picocli-impl = { module = 'info.picocli:picocli', version.ref = "picocli-version" }
 picocli-annotationprocessor = { module = 'info.picocli:picocli-codegen', version.ref = "picocli-version" }
-slf4j-api = "org.slf4j:slf4j-api:2.0.11"
-slf4j-nop = "org.slf4j:slf4j-nop:2.0.11"
+slf4j-bom = { module = "org.slf4j:slf4j-bom", version.ref = "slf4j-version" }
 spock = "org.spockframework:spock-bom:2.3-groovy-3.0"
 
 [plugins]
diff --git a/htmlSanityCheck-cli/build.gradle b/htmlSanityCheck-cli/build.gradle
index 5ee0437a..3fdcdf4b 100644
--- a/htmlSanityCheck-cli/build.gradle
+++ b/htmlSanityCheck-cli/build.gradle
@@ -2,25 +2,16 @@ plugins {
     id 'application'
 }
 
-test {
-    useJUnitPlatform()
-}
-
 dependencies {
     implementation libs.picocli.impl
     annotationProcessor libs.picocli.annotationprocessor
 
-    implementation libs.slf4j.api
-    implementation libs.slf4j.simple
-    implementation libs.groovy.all
+    implementation 'org.slf4j:slf4j-api'
+    implementation 'org.slf4j:slf4j-simple'
 
     implementation project(":htmlSanityCheck-core")
 
-    testImplementation libs.spock.core
-    testImplementation libs.jupiter.api
     testImplementation libs.mockito
-    testRuntimeOnly libs.jupiter.engine
-    testImplementation libs.spock.reports
 }
 
 compileGroovy {
@@ -30,4 +21,33 @@ compileGroovy {
 application {
     mainClass = 'org.aim42.htmlsanitycheck.cli.Main'
     applicationName = 'hsc'
-}
\ No newline at end of file
+}
+
+/*
+ * Copyright Gerd Aschemann and aim42 contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ */
diff --git a/htmlSanityCheck-core/build.gradle b/htmlSanityCheck-core/build.gradle
index 8a5898f9..a9086f93 100644
--- a/htmlSanityCheck-core/build.gradle
+++ b/htmlSanityCheck-core/build.gradle
@@ -1,8 +1,8 @@
 import org.apache.tools.ant.filters.ReplaceTokens
 
 dependencies {
-    implementation libs.slf4j.api
-    testImplementation libs.slf4j.nop
+    implementation 'org.slf4j:slf4j-api'
+    testImplementation 'org.slf4j:slf4j-nop'
     // jsoup is our awesome html parser, see jsoup.org
     implementation libs.jsoup
     implementation 'org.codehaus.groovy:groovy-xml'
diff --git a/htmlSanityCheck-gradle-plugin/build.gradle b/htmlSanityCheck-gradle-plugin/build.gradle
index 67c3f547..e2d47621 100755
--- a/htmlSanityCheck-gradle-plugin/build.gradle
+++ b/htmlSanityCheck-gradle-plugin/build.gradle
@@ -13,9 +13,11 @@ gradlePlugin {
 
 dependencies {
     implementation gradleApi()
+
     implementation project(":htmlSanityCheck-core")
 
     testImplementation(
+            libs.jsoup,
             gradleTestKit()
     )
 }