diff --git a/core/build.gradle b/core/build.gradle
index a18c4f7..4ca180b 100644
--- a/core/build.gradle
+++ b/core/build.gradle
@@ -1,5 +1,5 @@
 group = 'asys'
-version = '0.0-SNAPSHOT'
+version = '0.1-SNAPSHOT'
 
 apply plugin: 'application'
 
diff --git a/core/src/main/java/asys/core/Core.java b/core/src/main/java/asys/core/Core.java
index 2f3d065..87b5cbd 100644
--- a/core/src/main/java/asys/core/Core.java
+++ b/core/src/main/java/asys/core/Core.java
@@ -55,11 +55,21 @@ public class Core {
         config.put("felix.fileinstall.poll", 250);
         config.put("felix.fileinstall.log.level", 2);
         config.put("felix.fileinstall.noInitialDelay", true);
-        config.put("org.osgi.framework.system.packages.extra", "com.sun.net.httpserver;asys.api");
+        config.put("org.osgi.framework.system.packages.extra", extraPackages());
 
         return ImmutableMap.newInstance(config);
     }
 
+    private String extraPackages() {
+        StringJoiner sj = new StringJoiner(",");
+        sj.add("com.sun.net.httpserver");
+        sj.add("asys.api");
+        sj.add("asys.api.*");
+        sj.add("org.slf4j; version=1.7.21");
+        sj.add("org.slf4j.*; version=1.7.21");
+        return sj.toString();
+    }
+
     @PreDestroy
     public void stop() {
         startFelix();