diff --git a/pgp-keys-map.list b/pgp-keys-map.list
index f713d66..86f9d12 100644
--- a/pgp-keys-map.list
+++ b/pgp-keys-map.list
@@ -34,7 +34,7 @@ org.apache.maven.* = 0xB920D295BF0E61CB4CF0896C33CD6733AF5EC452,0x6A814B1F869C2B
 org.apache.velocity.* = 0x7B9751FC3F01F134F476464CD0EB627D4885CED1, 0x6F9D10E747DC79485ABB4F72B709E61252F136DD, 0xCE4439C1BEF3DA83B1832F9DBEFEEF227A98B809
 org.apache.xbean:xbean-reflect = 0x223D3A74B068ECA354DC385CE126833F9CF64915
 org.apiguardian:apiguardian-api = 0xFF6E2C001948C5F2F38B0CC385911F425EC61B51
-org.codehaus.plexus = 0x84789D24DF77A32433CE1F079EB80E92EB2135B1,0xFA77DCFEF2EE6EB2DEBEDD2C012579464D01C06A,0xB91AB7D2121DC6B0A61AA182D7742D58455ECC7C,0xF254B35617DC255D9344BCFA873A8E86B4372146,0x09A808E1930F779CC6C54807E4C753D85335E876,0x190D5A957FF22273E601F7A7C92C5FEC70161C62,0x073F7A9345756F3B40CDB99E6C70A3B7599C5736,0x32118CF76C9EC5D918E54967CA80D1F0EB6CA4BA
+org.codehaus.plexus = 0x84789D24DF77A32433CE1F079EB80E92EB2135B1,0xFA77DCFEF2EE6EB2DEBEDD2C012579464D01C06A,0xB91AB7D2121DC6B0A61AA182D7742D58455ECC7C,0xF254B35617DC255D9344BCFA873A8E86B4372146,0x09A808E1930F779CC6C54807E4C753D85335E876,0x190D5A957FF22273E601F7A7C92C5FEC70161C62,0x073F7A9345756F3B40CDB99E6C70A3B7599C5736,0x32118CF76C9EC5D918E54967CA80D1F0EB6CA4BA,0xEA23DB1360D9029481E7F2EFECDFEA3CB4493B94
 org.codehaus.plexus:plexus-i18n:jar:1.0-beta-10 = noSig
 org.codehaus.plexus:plexus-i18n:pom:1.0-beta-10 = noSig
 org.eclipse.sisu = 0x88BE34F94BDB2B5357044E2E3A387D43964143E3
diff --git a/pom.xml b/pom.xml
index 47ad2c0..06d660d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,8 @@
   <parent>
     <groupId>org.apache.maven.plugins</groupId>
     <artifactId>maven-plugins</artifactId>
-    <version>47</version>
+    <!-- also update in ITs: check-buildplan-info // compare-mono-->
+    <version>48</version>
     <relativePath />
   </parent>
 
@@ -35,6 +36,7 @@
   <description>Plugin to manage artifacts tasks</description>
 
   <prerequisites>
+    <!-- Several ITs list 3.0.5 as prerequisite-->
     <maven>3.6.3</maven>
   </prerequisites>
 
@@ -60,11 +62,12 @@
   </distributionManagement>
 
   <properties>
-    <mavenVersion>3.9.14</mavenVersion>
+    <mavenVersion>3.9.16</mavenVersion>
     <resolverVersion>1.9.27</resolverVersion>
     <doxiaVersion>2.1.0</doxiaVersion>
     <javaVersion>8</javaVersion>
     <project.build.outputTimestamp>2025-09-29T16:18:23Z</project.build.outputTimestamp>
+    <version.flatten-maven-plugin>1.7.3</version.flatten-maven-plugin>
   </properties>
 
   <dependencies>
diff --git a/src/it/check-buildplan-info/pom.xml b/src/it/check-buildplan-info/pom.xml
index b01cf47..d41e556 100644
--- a/src/it/check-buildplan-info/pom.xml
+++ b/src/it/check-buildplan-info/pom.xml
@@ -22,7 +22,7 @@
   <parent>
     <groupId>org.apache.maven</groupId>
     <artifactId>maven-parent</artifactId>
-    <version>39</version>
+    <version>48</version>
   </parent>
 
   <groupId>org.apache.maven.plugins.it</groupId>
@@ -40,7 +40,7 @@
         </plugin>
         <plugin>
           <artifactId>maven-remote-resources-plugin</artifactId>
-          <version>3.3.0</version>
+          <version>@version.maven-remote-resources-plugin@</version>
         </plugin>
       </plugins>
     </pluginManagement>
diff --git a/src/it/check-buildplan-info/verify.groovy b/src/it/check-buildplan-info/verify.groovy
index 9fca08d..7ebe779 100644
--- a/src/it/check-buildplan-info/verify.groovy
+++ b/src/it/check-buildplan-info/verify.groovy
@@ -21,4 +21,9 @@
 def buildLog = new File(basedir, 'build.log').text
 
 // https://issues.apache.org/jira/browse/MARTIFACT-24 & MARTIFACT-53 & MARTIFACT-71
-assert buildLog.contains('[INFO] <project.build.outputTimestamp> property (= 2022-12-11T20:07:23Z) is inherited, you can override in pom.xml')
+//assert buildLog.contains('[INFO] <project.build.outputTimestamp> property (= 2022-12-11T20:07:23Z) is inherited, you can override in pom.xml')
+// Afaik it's not possible to get a property from a parent when the own project (here: maven-artifact-plugin) overwrites it.
+// So it's not possible to pass the outputTimestamp property from maven-parent to the invoker-plugin as a script variable to be a checked here.
+// Therefore the string to be checked is divided to not contain a fixed timestamp.
+assert buildLog.contains("[INFO] <project.build.outputTimestamp> property (= ")
+assert buildLog.contains(" is inherited, you can override in pom.xml")
\ No newline at end of file
diff --git a/src/it/compare-flatten/pom.xml b/src/it/compare-flatten/pom.xml
index 0c3c784..f613b6e 100644
--- a/src/it/compare-flatten/pom.xml
+++ b/src/it/compare-flatten/pom.xml
@@ -69,7 +69,7 @@
       <plugin>
         <groupId>org.codehaus.mojo</groupId>
         <artifactId>flatten-maven-plugin</artifactId>
-        <version>1.2.2</version>
+        <version>@version.flatten-maven-plugin@</version>
         <configuration>
           <flattenedPomFilename>flattened-pom.xml</flattenedPomFilename>
         </configuration>
diff --git a/src/it/compare-mono/pom.xml b/src/it/compare-mono/pom.xml
index 7d86283..920231f 100644
--- a/src/it/compare-mono/pom.xml
+++ b/src/it/compare-mono/pom.xml
@@ -23,7 +23,7 @@
   <parent>
     <groupId>org.apache.maven</groupId>
     <artifactId>maven-parent</artifactId>
-    <version>39</version>
+    <version>48</version>
   </parent>
 
   <groupId>org.apache.maven.plugins.it.compare</groupId>
diff --git a/src/it/git-mono/pom.xml b/src/it/git-mono/pom.xml
index ba73928..2578916 100644
--- a/src/it/git-mono/pom.xml
+++ b/src/it/git-mono/pom.xml
@@ -76,7 +76,7 @@
       <plugins>
         <plugin>
           <artifactId>maven-jar-plugin</artifactId>
-          <version>3.4.1</version>
+          <version>@version.maven-jar-plugin@</version>
         </plugin>
       </plugins>
     </pluginManagement>