diff --git a/Cargo.lock b/Cargo.lock
index 30212b3..2bb6b1f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "aligned"
 version = "0.3.4"
@@ -11,9 +13,9 @@ dependencies = [
 
 [[package]]
 name = "arrayvec"
-version = "0.5.2"
+version = "0.7.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "23b62fc65de8e4e7f52534fb52b0f3ed04746ae267519eef2a83941e8085068b"
+checksum = "96d30a06541fbafbc7f82ed10c06164cfbd2c401138f6addd8404629c4b16711"
 
 [[package]]
 name = "as-slice"
@@ -224,8 +226,8 @@ dependencies = [
 
 [[package]]
 name = "panel-protocol"
-version = "0.4.0"
-source = "git+https://github.com/tonarino/panel-protocol.git?rev=0.4#47f7a1ed57a8ccee9fe69fe56ce22828e7ae6fa8"
+version = "0.6.0"
+source = "git+https://github.com/tonarino/panel-protocol.git?rev=0.6#7f8c353640619100a9a1d0fe577196c630657d94"
 dependencies = [
  "arrayvec",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index a023675..3e2feaf 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -12,7 +12,7 @@ cortex-m = "0.7"
 cortex-m-rt = "0.6"
 panic-reset = "0.1"
 nb = "1"
-panel-protocol = { git = "https://github.com/tonarino/panel-protocol.git", rev = "0.4" }
+panel-protocol = { git = "https://github.com/tonarino/panel-protocol.git", rev = "0.6" }
 usb-device = "0.2"
 usbd-serial = "0.1"
 libm = "0.2"
diff --git a/src/serial.rs b/src/serial.rs
index 748afb5..d7eb5bb 100644
--- a/src/serial.rs
+++ b/src/serial.rs
@@ -4,11 +4,13 @@ use hal::{
     otg_fs::{UsbBus, USB},
     serial::{self},
 };
-use panel_protocol::{ArrayString, ArrayVec, MAX_COMMAND_LEN, MAX_COMMAND_QUEUE_LEN};
+use panel_protocol::{ArrayString, ArrayVec, MAX_COMMAND_LEN};
 pub use panel_protocol::{Command, CommandReader, Report};
 use usb_device::{device::UsbDevice, UsbError};
 use usbd_serial::SerialPort;
 
+const MAX_COMMAND_QUEUE_LEN: usize = 8;
+
 type Stm32F4UsbDevice = stm32f4xx_hal::otg_fs::UsbBus<stm32f4xx_hal::otg_fs::USB>;
 
 #[derive(Debug)]
@@ -65,7 +67,7 @@ impl<'a> SerialProtocol<'a> {
     }
 
     /// Check to see if a new command from host is available
-    pub fn poll(&mut self) -> Result<ArrayVec<[Command; MAX_COMMAND_QUEUE_LEN]>, Error> {
+    pub fn poll(&mut self) -> Result<ArrayVec<Command, MAX_COMMAND_QUEUE_LEN>, Error> {
         self.usb_device.poll(&mut [&mut self.usb_serial_device]);
 
         match self.usb_serial_device.read(&mut self.read_buf[..]) {