diff --git a/rtic_v1/stm32l0_monotonic/Cargo.toml b/rtic_v1/stm32l0_monotonic/Cargo.toml
index fea1b1a..d0e169c 100644
--- a/rtic_v1/stm32l0_monotonic/Cargo.toml
+++ b/rtic_v1/stm32l0_monotonic/Cargo.toml
@@ -12,7 +12,7 @@ edition = "2021"
 cortex-m-rtic = "1.0.0"
 systick-monotonic = "1.0.1"
 panic-rtt-target = { version = "0.1.2", features = ["cortex-m"] }
-rtt-target = { version = "0.3.1", features = ["cortex-m"] }
+rtt-target = { version = "0.4.0", features = ["cortex-m"] }
 stm32l0xx-hal = { version = "0.10.0", features = ["rt", "mcu-STM32L031K6Tx"] }
 
 # this lets you use `cargo fix`!