diff --git a/library/Cargo.lock b/library/Cargo.lock
index 0d110b76b77ca..9eaf0e57730c1 100644
--- a/library/Cargo.lock
+++ b/library/Cargo.lock
@@ -42,9 +42,9 @@ checksum = "5c6cb57a04249c6480766f7f7cef5467412af1490f8d1e243141daddada3264f"
 
 [[package]]
 name = "cc"
-version = "1.0.105"
+version = "1.0.100"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5208975e568d83b6b05cc0a063c8e7e9acc2b43bee6da15616a5b73e109d7437"
+checksum = "c891175c3fb232128f48de6590095e59198bbeb8620c310be349bfc3afd12c7b"
 
 [[package]]
 name = "cfg-if"
diff --git a/library/profiler_builtins/Cargo.toml b/library/profiler_builtins/Cargo.toml
index d7b5c9fc0fb7e..33f4df3a2a45c 100644
--- a/library/profiler_builtins/Cargo.toml
+++ b/library/profiler_builtins/Cargo.toml
@@ -15,4 +15,4 @@ compiler_builtins = { version = "0.1.0", features = ['rustc-dep-of-std'] }
 [build-dependencies]
 # FIXME: updates past a certain point haven't been able to merge successfully.
 # See rust-lang/rust#130720.
-cc = "=1.0.105"
+cc = "=1.0.100"