diff --git a/.github/pull_request_template.md b/.github/pull_request_template.md
index 9baf775..ecfe4a0 100644
--- a/.github/pull_request_template.md
+++ b/.github/pull_request_template.md
@@ -19,7 +19,7 @@ Closes #
 
 ## Companion Pull Requests
 
-<!-- optionnal, indicate if this PR must be accepted in conjunction with some PR in other GEMOC github repositories in order to provide a working Studio-->
-<!-- you may have to edit this PR afte submitting it in order to get all cross references between the PRs -->
+<!-- optional, indicate if this PR must be accepted in conjunction with some PR in other GEMOC github repositories in order to provide a working Studio-->
+<!-- you may have to edit this PR after submitting it in order to get all cross references between the PRs -->
 
  - PR # 
diff --git a/.gitignore b/.gitignore
index d447a79..69fa912 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 bin/
 **/xtend-gen/
+**/*.class
 **/target/
diff --git a/.mvn/extensions.xml b/.mvn/extensions.xml
index 5724f5e..c8b79d9 100644
--- a/.mvn/extensions.xml
+++ b/.mvn/extensions.xml
@@ -3,6 +3,6 @@
   <extension>
     <groupId>org.eclipse.tycho.extras</groupId>
     <artifactId>tycho-pomless</artifactId>
-    <version>1.5.1</version>
+    <version>1.7.0</version>
   </extension>
 </extensions>
\ No newline at end of file
diff --git a/java_xdsml/plugins/org.eclipse.gemoc.execution.sequential.javaxdsml.ide.ui/src/org/eclipse/gemoc/execution/sequential/javaxdsml/ide/ui/wizards/CreateNewGemocSequentialLanguageProject.java b/java_xdsml/plugins/org.eclipse.gemoc.execution.sequential.javaxdsml.ide.ui/src/org/eclipse/gemoc/execution/sequential/javaxdsml/ide/ui/wizards/CreateNewGemocSequentialLanguageProject.java
index 524926c..7e235de 100644
--- a/java_xdsml/plugins/org.eclipse.gemoc.execution.sequential.javaxdsml.ide.ui/src/org/eclipse/gemoc/execution/sequential/javaxdsml/ide/ui/wizards/CreateNewGemocSequentialLanguageProject.java
+++ b/java_xdsml/plugins/org.eclipse.gemoc.execution.sequential.javaxdsml.ide.ui/src/org/eclipse/gemoc/execution/sequential/javaxdsml/ide/ui/wizards/CreateNewGemocSequentialLanguageProject.java
@@ -176,8 +176,8 @@ private void updateManifestFile (IProject project, IProgressMonitor monitor) {
 		try {
 			ManifestChanger manifestChanger = new ManifestChanger(project.getFile("META-INF/MANIFEST.MF"));
 
-			manifestChanger.addPluginDependency("org.eclipse.xtend.lib", "2.14.0", false, true);
-			manifestChanger.addPluginDependency("org.eclipse.xtext.xbase.lib", "2.14.0", false, true);
+			manifestChanger.addPluginDependency("org.eclipse.xtend.lib", "2.21.0", false, true);
+			manifestChanger.addPluginDependency("org.eclipse.xtext.xbase.lib", "2.21.0", false, true);
 			manifestChanger.addPluginDependency("com.google.guava", "0.0.0", false, true);
 			manifestChanger.addPluginDependency("org.eclipse.emf.ecore.xmi", "2.8.0", true, true);
 			manifestChanger.addPluginDependency("org.eclipse.emf.ecore", "2.8.0", true, true);
diff --git a/pom.xml b/pom.xml
index 6d62def..fa26dff 100644
--- a/pom.xml
+++ b/pom.xml
@@ -10,15 +10,15 @@
     <packaging>pom</packaging>    
 
     <properties>
-		<tycho-version>1.5.1</tycho-version>
-    	<xtend.version>2.14.0</xtend.version>
+		<tycho-version>1.7.0</tycho-version>
+    	<xtend.version>2.21.0</xtend.version>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<tycho.scmUrl>scm:git:https://github.com/eclipse/gemoc-studio-execution-java.git</tycho.scmUrl>
 		<!-- <sonar.projectKey>gemoc:${project.groupId}:${project.artifactId}</sonar.projectKey>-->	
 		
-		<eclipse.release.p2.url>http://download.eclipse.org/releases/photon</eclipse.release.p2.url>
+		<eclipse.release.p2.url>http://download.eclipse.org/releases/2020-03</eclipse.release.p2.url>
 		<k3.p2.url>http://www.kermeta.org/k3/update_2018-09-05</k3.p2.url>
-		<melange.p2.url>http://melange.inria.fr/updatesite/nightly/update_2018-12-03/</melange.p2.url>
+		<melange.p2.url>http://melange.inria.fr/updatesite/nightly/update_2020-06-19</melange.p2.url>
 		<elk.p2.url>http://download.eclipse.org/elk/updates/releases/0.4.1</elk.p2.url>
 		<aspectJ.p2.url>http://download.eclipse.org/tools/ajdt/48/dev/update</aspectJ.p2.url>
 		<sirius.p2.url>https://download.eclipse.org/sirius/updates/releases/6.1.3/photon</sirius.p2.url>