diff --git a/Cargo.toml b/Cargo.toml
index 50f251f..8708730 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,7 +16,4 @@ features = ["atmega32u4"]
 
 # The latest releases of `proc-macro2` do not support the rust toolchain that
 # we use.  Thus, we must fix this dependency to an older version where our
-# toolchain is still supported.  See https://github.com/Rahix/avr-hal/issues/537
-[build-dependencies.proc-macro2]
-version = "=1.0.79"
-
+# toolchain is still supported.  See https://github.com/Rahix/avr-hal/issues/537
\ No newline at end of file