diff --git a/libs/microbit/core.cpp b/libs/microbit/core.cpp
index b74c3cc5..ab1638b4 100644
--- a/libs/microbit/core.cpp
+++ b/libs/microbit/core.cpp
@@ -171,9 +171,13 @@ namespace pxt {
   //%
   void registerWithDal(int id, int event, Action a);
   //%
-  void runAction0(Action a);
+  uint32_t runAction3(Action a, int arg0, int arg1, int arg2);
   //%
-  void runAction1(Action a, int arg);
+  uint32_t runAction2(Action a, int arg0, int arg1);
+  //%
+  uint32_t runAction1(Action a, int arg0);
+  //%
+  uint32_t runAction0(Action a);
   //%
   Action mkAction(int reflen, int totallen, int startptr);
   //%
diff --git a/pxtarget.json b/pxtarget.json
index 238d364d..f99004db 100644
--- a/pxtarget.json
+++ b/pxtarget.json
@@ -74,7 +74,7 @@
         "yottaTarget": "bbc-microbit-classic-gcc",
         "yottaCorePackage": "pxt-microbit-core",
         "githubCorePackage": "microsoft/pxt-microbit-core",
-        "gittag": "v0.2.2",
+        "gittag": "v0.3.1",
         "serviceId": "ws"
     },
     "serial": {