diff --git a/advanced/firmware/Cargo.toml b/advanced/firmware/Cargo.toml
index 2938341..6e72cfd 100644
--- a/advanced/firmware/Cargo.toml
+++ b/advanced/firmware/Cargo.toml
@@ -12,18 +12,18 @@ usb2 = "0.0.1"
 
 [dependencies]
 consts = { path = "../common/consts" }
-cortex-m = "0.7.3"
-cortex-m-rt = "0.7.1"
-cortex-m-rtic = "1.0.0"
-defmt = "0.3.0"
-defmt-rtt = "0.3.1"
+cortex-m = "0.7.6"
+cortex-m-rt = "0.7.2"
+cortex-m-rtic = "1.1.3"
+defmt = "0.3.2"
+defmt-rtt = "0.3.2"
 dk = { path = "../../boards/dk", features = ["advanced"] }
 panic-probe = { version = "0.3.0", features = ["print-defmt"] }
 usb = { path = "../common/usb" }
 usb2 = "0.0.1"
 
 [dependencies.heapless]
-version = "0.7.9"
+version = "0.7.16"
 features = ["defmt-impl"]
 
 # optimize code in both profiles
diff --git a/beginner/apps/Cargo.toml b/beginner/apps/Cargo.toml
index 633f9b2..61ee794 100644
--- a/beginner/apps/Cargo.toml
+++ b/beginner/apps/Cargo.toml
@@ -6,13 +6,13 @@ name = "apps"
 version = "0.0.0"
 
 [dependencies]
-cortex-m = "0.7.3"
-cortex-m-rt = "0.7.1"
+cortex-m = {version = "0.7.6", features = ["critical-section-single-core"]}
+cortex-m-rt = "0.7.2"
 dk = { path = "../../boards/dk", features = ["beginner"] }
-heapless = "0.7.9"
+heapless = "0.7.16"
 panic-probe = { version = "0.3.0", features = ["print-defmt"] }
-defmt = "0.3.0"
-defmt-rtt = "0.3.1"
+defmt = "0.3.2"
+defmt-rtt = "0.3.2"
 
 # optimize code in both profiles
 [profile.dev]
@@ -34,12 +34,11 @@ opt-level = 3
 overflow-checks = false
 
 [features]
-# set defmt logging levels here
-default = [
-  "defmt-default",
-  # "dependency-a/defmt-trace",
-]
 
+default = [
+  "other-feature"
+]
+other-feature = []
 # do NOT modify these features
 defmt-default = []
 defmt-trace = []
diff --git a/beginner/apps/src/bin/radio-puzzle-3.rs b/beginner/apps/src/bin/radio-puzzle-3.rs
index 10529f4..a5041ae 100644
--- a/beginner/apps/src/bin/radio-puzzle-3.rs
+++ b/beginner/apps/src/bin/radio-puzzle-3.rs
@@ -20,7 +20,7 @@ fn main() -> ! {
     radio.set_channel(Channel::_25);
 
     // capacity (128) should be large enough for the ASCII range
-    let mut dict = LinearMap::<u8, u8, 128>::new();
+    let dict = LinearMap::<u8, u8, 128>::new();
 
     let mut packet = Packet::new();
     // TODO do the whole ASCII range [0, 127]
diff --git a/boards/dk/Cargo.toml b/boards/dk/Cargo.toml
index a4213f6..aebbd62 100644
--- a/boards/dk/Cargo.toml
+++ b/boards/dk/Cargo.toml
@@ -6,23 +6,22 @@ name = "dk"
 version = "0.0.0"
 
 [dependencies]
-cortex-m = "0.7.3"
-cortex-m-rt = "0.7.1"
-embedded-hal = "0.2.6"
+cortex-m = {version = "0.7.6", features = ["critical-section-single-core"]}
+cortex-m-rt = "0.7.2"
+embedded-hal = "0.2.7"
 hal = { package = "nrf52840-hal", version = "0.14.0" }
 panic-probe = { version = "0.3.0", features = ["print-defmt"] }
-defmt = "0.3.0"
-defmt-rtt = "0.3.1"
+defmt = "0.3.2"
+defmt-rtt = "0.3.2"
 
 [features]
 advanced = []
 beginner = []
 
-# set defmt logging levels here
 default = [
-  "defmt-info",
-  # "dependency-a/defmt-trace",
+  "other-feature"
 ]
+other-feature = []
 
 # do NOT modify these features
 defmt-default = []
diff --git a/common/panic-log/Cargo.toml b/common/panic-log/Cargo.toml
index 5b61b67..b182e53 100644
--- a/common/panic-log/Cargo.toml
+++ b/common/panic-log/Cargo.toml
@@ -6,16 +6,16 @@ name = "panic-log"
 version = "0.0.0"
 
 [dependencies]
-cortex-m = "0.6.4"
-defmt = "0.2.1"
+cortex-m = "0.7.6"
+defmt = "0.3.2"
 
 
 [features]
-# set defmt logging levels here
+
 default = [
-  "defmt-debug",
-  # "dependency-a/defmt-trace",
+  "other-feature"
 ]
+other-feature = []
 
 # do NOT modify these features
 defmt-default = []
diff --git a/embedded-workshop-book/src/panicking.md b/embedded-workshop-book/src/panicking.md
index 72cba13..2d0665e 100644
--- a/embedded-workshop-book/src/panicking.md
+++ b/embedded-workshop-book/src/panicking.md
@@ -37,12 +37,13 @@ stack backtrace:
 
 In `no_std` programs the behavior of panic is defined using the `#[panic_handler]` attribute. In the example, the *panic handler* is defined in the `panic_log` crate but we can also implement it manually:
 
-✅ Comment out the `panic_probe` import and add the following function to the example:
+✅ Comment out the `use apps as _;` import and add the following function to the example:
 
 ``` rust
 #[panic_handler]
 fn panic(info: &core::panic::PanicInfo) -> ! {
-    defmt::panic!("{}", info);
+    defmt::error!("{}", defmt::Debug2Format(info));
+    asm::udf();
 }
 ```
 
diff --git a/embedded-workshop-book/src/using-hal.md b/embedded-workshop-book/src/using-hal.md
index 1537497..67e5f1c 100644
--- a/embedded-workshop-book/src/using-hal.md
+++ b/embedded-workshop-book/src/using-hal.md
@@ -28,15 +28,10 @@ $ cargo doc -p dk --open
 
 ✅ Check the API docs of the `Led` abstraction. Change the `led` program, so that the bottom two LEDs are turned on, and the top two are turned off.
 
-🔎 If you want to see logs from Led API of the `dk` Hardware Abstraction Layer, go to `boards/dk/Cargo.toml` and change the log level of the `dk` crate:
+🔎 If you want to see logs from Led API of the `dk` Hardware Abstraction Layer, flash the dk with the following environment variable:
 
-```diff
-# set defmt logging levels here
-default = [
--  "defmt-debug",
-+  "defmt-trace",
-  # "dependency-a/defmt-trace",
-]
+```console
+$ DEFMT_LOG=trace cargo run --bin led
 ```
 
 Among the logs you'll find the line "I/O pins have been configured for digital output". At this point the electrical pins of the nRF52840 microcontroller have been configured to drive the 4 LEDs on the board.