diff --git a/README.md b/README.md
index 20e2bef2a8..fe2b9503d1 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,6 @@ It provides a common build configuration for all Jenkins plugins.
 
 ## Requirements
 
-Since version 6.2105.v0879858b_48d2, the plugin parent POM requires Jenkins 2.516 or newer and JDK 21 or newer.  
 Since version 5.0, the plugin parent POM requires Jenkins 2.479 or newer and JDK 17 or newer.  
 Since version 4.52, the plugin parent POM requires Jenkins 2.361 or newer and JDK 11 or newer.  
 Since version 4.40, the plugin parent POM supports Java 17.  
@@ -36,7 +35,7 @@ Then override the needed properties, e.g.:
     Take a look the developer documentation for the baseline version to use
     https://www.jenkins.io/doc/developer/plugin-development/choosing-jenkins-baseline/#currently-recommended-versions
     -->
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.361.4</jenkins.version>
   </properties>
 ```
 
diff --git a/pom.xml b/pom.xml
index 57a6fec383..1d089401c1 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,7 +61,7 @@
     <project.build.outputEncoding>UTF-8</project.build.outputEncoding>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-    <maven.compiler.release>21</maven.compiler.release>
+    <maven.compiler.release>17</maven.compiler.release>
     <maven.compiler.testRelease>${maven.compiler.release}</maven.compiler.testRelease>
     <!-- Generate metadata for reflection on method parameters -->
     <maven.compiler.parameters>true</maven.compiler.parameters>
@@ -83,7 +83,7 @@
     <incrementals-plugin.version>1.13</incrementals-plugin.version>
     <flatten-maven-plugin.version>1.7.3</flatten-maven-plugin.version>
     <jacoco-maven-plugin.version>0.8.14</jacoco-maven-plugin.version>
-    <jenkins.version>2.516</jenkins.version>
+    <jenkins.version>2.479</jenkins.version>
     <jenkins-bom.version>${jenkins.version}</jenkins-bom.version>
     <jenkins-test-harness.version>2544.v272f2b_d841b_2</jenkins-test-harness.version>
     <junit.version>6.0.1</junit.version>
@@ -1663,6 +1663,17 @@
         <yarn.lint.skip>true</yarn.lint.skip>
       </properties>
     </profile>
+    <profile>
+      <id>java-level-17</id>
+      <activation>
+        <file>
+          <exists>target/java-level/17</exists>
+        </file>
+      </activation>
+      <properties>
+        <maven.compiler.release>17</maven.compiler.release>
+      </properties>
+    </profile>
     <profile>
       <id>java-level-21</id>
       <activation>
diff --git a/src/it/ban-junit4-fail/pom.xml b/src/it/ban-junit4-fail/pom.xml
index d0f9f85e4c..a10136853c 100644
--- a/src/it/ban-junit4-fail/pom.xml
+++ b/src/it/ban-junit4-fail/pom.xml
@@ -12,7 +12,7 @@
     <version>1.0-SNAPSHOT</version>
     <packaging>hpi</packaging>
     <properties>
-        <jenkins.version>2.516.3</jenkins.version>
+        <jenkins.version>2.479.3</jenkins.version>
         <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
     </properties>
     <repositories>
diff --git a/src/it/ban-junit4-pass/pom.xml b/src/it/ban-junit4-pass/pom.xml
index 76c6acdcd3..d25632cee2 100644
--- a/src/it/ban-junit4-pass/pom.xml
+++ b/src/it/ban-junit4-pass/pom.xml
@@ -12,7 +12,7 @@
     <version>1.0-SNAPSHOT</version>
     <packaging>hpi</packaging>
     <properties>
-        <jenkins.version>2.516.3</jenkins.version>
+        <jenkins.version>2.479.3</jenkins.version>
         <ban-junit4-imports.skip>false</ban-junit4-imports.skip>
     </properties>
     <repositories>
diff --git a/src/it/benchmark/pom.xml b/src/it/benchmark/pom.xml
index eb336bd94a..fe55c5cc95 100644
--- a/src/it/benchmark/pom.xml
+++ b/src/it/benchmark/pom.xml
@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>jar</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
   </properties>
   <repositories>
     <repository>
diff --git a/src/it/beta-fail/pom.xml b/src/it/beta-fail/pom.xml
index ed0070ca8c..cea847baa9 100644
--- a/src/it/beta-fail/pom.xml
+++ b/src/it/beta-fail/pom.xml
@@ -16,7 +16,7 @@
     <module>downstream</module>
   </modules>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
   </properties>
diff --git a/src/it/beta-just-testing/pom.xml b/src/it/beta-just-testing/pom.xml
index 78a24d4250..354466be3b 100644
--- a/src/it/beta-just-testing/pom.xml
+++ b/src/it/beta-just-testing/pom.xml
@@ -16,7 +16,7 @@
     <module>downstream</module>
   </modules>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
   </properties>
diff --git a/src/it/beta-pass/pom.xml b/src/it/beta-pass/pom.xml
index 518bb33c0f..0268b123cf 100644
--- a/src/it/beta-pass/pom.xml
+++ b/src/it/beta-pass/pom.xml
@@ -16,7 +16,7 @@
     <module>downstream</module>
   </modules>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
   </properties>
diff --git a/src/it/cd-plugin/pom.xml b/src/it/cd-plugin/pom.xml
index 7ecc28fc3f..1716a6bb85 100644
--- a/src/it/cd-plugin/pom.xml
+++ b/src/it/cd-plugin/pom.xml
@@ -14,7 +14,7 @@
   <name>CD plugin</name>
   <description>CD description</description>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <changelist>999999-SNAPSHOT</changelist>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>
diff --git a/src/it/incrementals-and-plugin-bom/pom.xml b/src/it/incrementals-and-plugin-bom/pom.xml
index c93d65ab36..a384a77842 100644
--- a/src/it/incrementals-and-plugin-bom/pom.xml
+++ b/src/it/incrementals-and-plugin-bom/pom.xml
@@ -14,15 +14,15 @@
   <properties>
     <revision>1.0</revision>
     <changelist>-SNAPSHOT</changelist>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>
   <dependencyManagement>
     <dependencies>
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
-        <artifactId>bom-2.516.x</artifactId>
-        <version>5857.vb_f3dd0731f44</version>
+        <artifactId>bom-2.479.x</artifactId>
+        <version>3559.vb_5b_81183b_d23</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>
diff --git a/src/it/localizer/pom.xml b/src/it/localizer/pom.xml
index 184e8f6d03..f302b4cc1b 100644
--- a/src/it/localizer/pom.xml
+++ b/src/it/localizer/pom.xml
@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
     <maven-hpi-plugin.disabledTestInjection>true</maven-hpi-plugin.disabledTestInjection>
   </properties>
diff --git a/src/it/override-jth-fail/pom.xml b/src/it/override-jth-fail/pom.xml
index e65adb22d9..059749b834 100644
--- a/src/it/override-jth-fail/pom.xml
+++ b/src/it/override-jth-fail/pom.xml
@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
   </properties>
   <dependencyManagement>
     <dependencies>
diff --git a/src/it/override-jth-pass/pom.xml b/src/it/override-jth-pass/pom.xml
index 31710c1812..251c81fe78 100644
--- a/src/it/override-jth-pass/pom.xml
+++ b/src/it/override-jth-pass/pom.xml
@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <!-- Must differ from the current jth version defined via property -->
     <jenkins-test-harness.version>2384.va_d3a_58a_4b_df5</jenkins-test-harness.version>
   </properties>
diff --git a/src/it/sample-plugin/pom.xml b/src/it/sample-plugin/pom.xml
index 02d251cb83..2dbab61e4f 100644
--- a/src/it/sample-plugin/pom.xml
+++ b/src/it/sample-plugin/pom.xml
@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
     <spotless.check.skip>false</spotless.check.skip>
   </properties>
   <dependencies>
diff --git a/src/it/servlet-api/pom.xml b/src/it/servlet-api/pom.xml
index d8f628fe90..0d44d9b101 100644
--- a/src/it/servlet-api/pom.xml
+++ b/src/it/servlet-api/pom.xml
@@ -12,7 +12,7 @@
   <version>1.0-SNAPSHOT</version>
   <packaging>hpi</packaging>
   <properties>
-    <jenkins.version>2.516.3</jenkins.version>
+    <jenkins.version>2.479.1</jenkins.version>
   </properties>
   <dependencies>
     <dependency>