diff --git a/libs/base/enums.d.ts b/libs/base/enums.d.ts
index 65d1dc38..bd7fcd0e 100644
--- a/libs/base/enums.d.ts
+++ b/libs/base/enums.d.ts
@@ -30,7 +30,5 @@
     Object = 4,
     Function = 5,
     }
-declare namespace serial {
-}
 
 // Auto-generated. Do not edit. Really.
diff --git a/libs/base/shims.d.ts b/libs/base/shims.d.ts
new file mode 100644
index 00000000..4fed2348
--- /dev/null
+++ b/libs/base/shims.d.ts
@@ -0,0 +1,158 @@
+// Auto-generated. Do not edit.
+
+
+
+    //% indexerGet=BufferMethods::getByte indexerSet=BufferMethods::setByte
+declare interface Buffer {
+    /**
+     * Write a number in specified format in the buffer.
+     */
+    //% shim=BufferMethods::setNumber
+    setNumber(format: NumberFormat, offset: int32, value: number): void;
+
+    /**
+     * Read a number in specified format from the buffer.
+     */
+    //% shim=BufferMethods::getNumber
+    getNumber(format: NumberFormat, offset: int32): number;
+
+    /** Returns the length of a Buffer object. */
+    //% property shim=BufferMethods::length
+    length: int32;
+
+    /**
+     * Fill (a fragment) of the buffer with given value.
+     */
+    //% offset.defl=0 length.defl=-1 shim=BufferMethods::fill
+    fill(value: int32, offset?: int32, length?: int32): void;
+
+    /**
+     * Return a copy of a fragment of a buffer.
+     */
+    //% offset.defl=0 length.defl=-1 shim=BufferMethods::slice
+    slice(offset?: int32, length?: int32): Buffer;
+
+    /**
+     * Shift buffer left in place, with zero padding.
+     * @param offset number of bytes to shift; use negative value to shift right
+     * @param start start offset in buffer. Default is 0.
+     * @param length number of elements in buffer. If negative, length is set as the buffer length minus
+     * start. eg: -1
+     */
+    //% start.defl=0 length.defl=-1 shim=BufferMethods::shift
+    shift(offset: int32, start?: int32, length?: int32): void;
+
+    /**
+     * Convert a buffer to its hexadecimal representation.
+     */
+    //% shim=BufferMethods::toHex
+    toHex(): string;
+
+    /**
+     * Rotate buffer left in place.
+     * @param offset number of bytes to shift; use negative value to shift right
+     * @param start start offset in buffer. Default is 0.
+     * @param length number of elements in buffer. If negative, length is set as the buffer length minus
+     * start. eg: -1
+     */
+    //% start.defl=0 length.defl=-1 shim=BufferMethods::rotate
+    rotate(offset: int32, start?: int32, length?: int32): void;
+
+    /**
+     * Write contents of `src` at `dstOffset` in current buffer.
+     */
+    //% shim=BufferMethods::write
+    write(dstOffset: int32, src: Buffer): void;
+}
+declare namespace loops {
+
+    /**
+     * Repeats the code forever in the background. On each iteration, allows other codes to run.
+     * @param body code to execute
+     */
+    //% help=loops/forever weight=100 blockGap=8
+    //% blockId=forever block="forever" blockAllowMultiple=1 shim=loops::forever
+    function forever(a: () => void): void;
+
+    /**
+     * Pause for the specified time in milliseconds
+     * @param ms how long to pause for, eg: 100, 200, 500, 1000, 2000
+     */
+    //% help=loops/pause weight=99
+    //% async block="pause (ms) %pause"
+    //% blockId=device_pause shim=loops::pause
+    function pause(ms: int32): void;
+}
+declare namespace control {
+
+    /**
+     * Gets the number of milliseconds elapsed since power on.
+     */
+    //% help=control/millis weight=50
+    //% blockId=control_running_time block="millis (ms)" shim=control::millis
+    function millis(): int32;
+
+    /**
+     * Run code when a registered event happens.
+     * @param id the event compoent id
+     * @param value the event value to match
+     */
+    //% weight=20 blockGap=8 blockId="control_on_event" block="on event|from %src|with value %value"
+    //% blockExternalInputs=1
+    //% help="control/on-event" shim=control::onEvent
+    function onEvent(src: int32, value: int32, handler: () => void): void;
+
+    /**
+     * Reset the device.
+     */
+    //% weight=30 async help=control/reset blockGap=8
+    //% blockId="control_reset" block="reset" shim=control::reset
+    function reset(): void;
+
+    /**
+     * Block the current fiber for the given microseconds
+     * @param micros number of micro-seconds to wait. eg: 4
+     */
+    //% help=control/wait-micros weight=29 async
+    //% blockId="control_wait_us" block="wait (µs)%micros" shim=control::waitMicros
+    function waitMicros(micros: int32): void;
+
+    /**
+     * Run other code in the background.
+     */
+    //% help=control/run-in-background blockAllowMultiple=1
+    //% blockId="control_run_in_background" block="run in background" blockGap=8 shim=control::runInBackground
+    function runInBackground(a: () => void): void;
+
+    /**
+     * Blocks the calling thread until the specified event is raised.
+     */
+    //% help=control/wait-for-event async
+    //% blockId=control_wait_for_event block="wait for event|from %src|with value %value" shim=control::waitForEvent
+    function waitForEvent(src: int32, value: int32): void;
+
+    /**
+     * Derive a unique, consistent serial number of this device from internal data.
+     */
+    //% blockId="control_device_serial_number" block="device serial number" weight=9 shim=control::deviceSerialNumber
+    function deviceSerialNumber(): int32;
+}
+declare namespace serial {
+
+    /**
+     * Write some text to the serial port.
+     */
+    //% help=serial/write-string
+    //% weight=87
+    //% blockId=serial_writestring block="serial|write string %text" shim=serial::writeString
+    function writeString(text: string): void;
+
+    /**
+     * Send a buffer across the serial connection.
+     */
+    //% help=serial/write-buffer advanced=true weight=6
+    //% blockId=serial_writebuffer block="serial|write buffer %buffer" shim=serial::writeBuffer
+    function writeBuffer(buffer: Buffer): void;
+}
+
+// Auto-generated. Do not edit. Really.
diff --git a/package.json b/package.json
index aee9e0a1..6f76c4b6 100644
--- a/package.json
+++ b/package.json
@@ -39,8 +39,8 @@
     "semantic-ui-less": "^2.2.4"
   },
   "dependencies": {
-    "pxt-common-packages": "0.8.1",
-    "pxt-core": "1.7.4"
+    "pxt-common-packages": "0.9.1",
+    "pxt-core": "1.8.10"
   },
   "scripts": {
     "test": "node node_modules/pxt-core/built/pxt.js travis"