diff --git a/simtools.gaml.extensions.physics/.classpath b/simtools.gaml.extensions.physics/.classpath
index 2e3010ebb3..9ccfd50ace 100644
--- a/simtools.gaml.extensions.physics/.classpath
+++ b/simtools.gaml.extensions.physics/.classpath
@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
+	<classpathentry exported="true" kind="lib" path="lib/jbullet-1.0.1.jar" sourcepath="lib/jbullet-1.0.1-sources.jar"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-11"/>
 	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
 	<classpathentry exported="true" kind="lib" path="lib/vecmath-1.5.2.jar"/>
 	<classpathentry kind="src" path="src"/>
-	<classpathentry exported="true" kind="lib" path="lib/jbullet.jar"/>
 	<classpathentry kind="src" path="gaml">
 		<attributes>
 			<attribute name="optional" value="true"/>
diff --git a/simtools.gaml.extensions.physics/META-INF/MANIFEST.MF b/simtools.gaml.extensions.physics/META-INF/MANIFEST.MF
index fc085d3caa..cfc1605ff6 100644
--- a/simtools.gaml.extensions.physics/META-INF/MANIFEST.MF
+++ b/simtools.gaml.extensions.physics/META-INF/MANIFEST.MF
@@ -6,8 +6,8 @@ Bundle-Version: 1.8.1.qualifier
 Require-Bundle: msi.gama.core,
  msi.gama.ext
 Bundle-ClassPath: .,
- lib/jbullet.jar,
- lib/vecmath-1.5.2.jar
+ lib/vecmath-1.5.2.jar,
+ lib/jbullet-1.0.1.jar
 Export-Package: 
  javax.vecmath,
  simtools.gaml.extensions.physics
diff --git a/simtools.gaml.extensions.physics/build.properties b/simtools.gaml.extensions.physics/build.properties
index 07c3001d53..871d6d1c0f 100644
--- a/simtools.gaml.extensions.physics/build.properties
+++ b/simtools.gaml.extensions.physics/build.properties
@@ -5,5 +5,8 @@ bin.includes = META-INF/,\
                .,\
                plugin.xml,\
                lib/,\
-               models/
+               models/,\
+               lib/jbullet-1.0.1.jar
+bin.excludes = lib/jbullet.jar,\
+               lib/jbullet-1.0.1-sources.jar
  
\ No newline at end of file
diff --git a/simtools.gaml.extensions.physics/lib/jbullet-1.0.1-sources.jar b/simtools.gaml.extensions.physics/lib/jbullet-1.0.1-sources.jar
new file mode 100644
index 0000000000..1d33947749
Binary files /dev/null and b/simtools.gaml.extensions.physics/lib/jbullet-1.0.1-sources.jar differ
diff --git a/simtools.gaml.extensions.physics/lib/jbullet-1.0.1.jar b/simtools.gaml.extensions.physics/lib/jbullet-1.0.1.jar
new file mode 100644
index 0000000000..64e6cb0d57
Binary files /dev/null and b/simtools.gaml.extensions.physics/lib/jbullet-1.0.1.jar differ
diff --git a/simtools.gaml.extensions.physics/lib/jbullet.jar b/simtools.gaml.extensions.physics/lib/jbullet.jar
deleted file mode 100644
index 43926d5df8..0000000000
Binary files a/simtools.gaml.extensions.physics/lib/jbullet.jar and /dev/null differ