diff --git a/sigil/common/core/.classpath b/sigil/common/core/.classpath
index 2503159..c9ffd60 100644
--- a/sigil/common/core/.classpath
+++ b/sigil/common/core/.classpath
@@ -2,6 +2,6 @@
 <classpath>
 	<classpathentry kind="src" path="src"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER"/>
-	<classpathentry kind="con" path="org.cauldron.sigil.core.classpathContainer"/>
+	<classpathentry kind="con" path="org.apache.felix.sigil.classpathContainer"/>
 	<classpathentry kind="output" path="build/classes"/>
 </classpath>
diff --git a/sigil/common/core/.project b/sigil/common/core/.project
index 08f3aa5..b7701c6 100644
--- a/sigil/common/core/.project
+++ b/sigil/common/core/.project
@@ -11,14 +11,13 @@
 			</arguments>
 		</buildCommand>
 		<buildCommand>
-			<name>org.cauldron.sigil.core.newtonBuilder</name>
+			<name>org.apache.felix.sigil.eclipse.core.sigilBuilder</name>
 			<arguments>
 			</arguments>
 		</buildCommand>
 	</buildSpec>
 	<natures>
-		<nature>org.eclipse.pde.PluginNature</nature>
+		<nature>org.apache.felix.sigil.sigilnature</nature>
 		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.cauldron.sigil.core.newtonnature</nature>
 	</natures>
 </projectDescription>