diff --git a/examples/stm32f4-event-printer/Cargo.lock b/examples/stm32f4-event-printer/Cargo.lock
index 2bc35b5..ea0b138 100644
--- a/examples/stm32f4-event-printer/Cargo.lock
+++ b/examples/stm32f4-event-printer/Cargo.lock
@@ -127,9 +127,9 @@ checksum = "7059fff8937831a9ae6f0fe4d658ffabf58f2ca96aa9dec1c889f936f705f216"
 
 [[package]]
 name = "defmt"
-version = "0.3.6"
+version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3939552907426de152b3c2c6f51ed53f98f448babd26f28694c95f5906194595"
+checksum = "a99dd22262668b887121d4672af5a64b238f026099f1a2a1b322066c9ecfe9e0"
 dependencies = [
  "bitflags",
  "defmt-macros",
diff --git a/examples/stm32f4-event-printer/Cargo.toml b/examples/stm32f4-event-printer/Cargo.toml
index 6b6afb4..be83dd8 100644
--- a/examples/stm32f4-event-printer/Cargo.toml
+++ b/examples/stm32f4-event-printer/Cargo.toml
@@ -13,7 +13,7 @@ stm32f4xx-hal = { version = "0.19", features = ["stm32f401", "rtic", "rtic-monot
 
 fugit = "0.3"
 
-defmt = "0.3.6"
+defmt = "0.3.8"
 defmt-rtt = "0.4"
 
 # use `adafruit-bluefruit-protocol = "0.1"` in reality; path used here to ensure that the example always compiles against the latest master