diff --git a/src/exercises/bare-metal/rtc/Cargo.lock b/src/exercises/bare-metal/rtc/Cargo.lock
index f2c5e615..7255a265 100644
--- a/src/exercises/bare-metal/rtc/Cargo.lock
+++ b/src/exercises/bare-metal/rtc/Cargo.lock
@@ -25,12 +25,9 @@ checksum = "ed570934406eb16438a4e976b1b4500774099c13b8cb96eec99f620f05090ddf"
 
 [[package]]
 name = "cc"
-version = "1.0.83"
+version = "1.0.88"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f1174fb0b6ec23863f8b971027804a42614e347eafb0a95bf0b12cdae21fc4d0"
-dependencies = [
- "libc",
-]
+checksum = "02f341c093d19155a6e41631ce5971aac4e9a868262212153124c15fa22d1cdc"
 
 [[package]]
 name = "chrono"
@@ -41,12 +38,6 @@ dependencies = [
  "num-traits",
 ]
 
-[[package]]
-name = "libc"
-version = "0.2.148"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9cdc71e17332e86d2e1d38c1f99edcb6288ee11b815fb1a4b049eaa2114d369b"
-
 [[package]]
 name = "lock_api"
 version = "0.4.10"
diff --git a/src/exercises/bare-metal/rtc/Cargo.toml b/src/exercises/bare-metal/rtc/Cargo.toml
index 1e83aa37..71f26397 100644
--- a/src/exercises/bare-metal/rtc/Cargo.toml
+++ b/src/exercises/bare-metal/rtc/Cargo.toml
@@ -15,4 +15,4 @@ smccc = "0.1.1"
 spin = "0.9.8"
 
 [build-dependencies]
-cc = "1.0.73"
+cc = "1.0.88"