diff --git a/Cargo.toml b/Cargo.toml
index c3fcacf53dd..9abf06857e1 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -64,7 +64,7 @@ walkdir = "2.2"
 clap = "2.31.2"
 unicode-width = "0.1.5"
 openssl = { version = '0.10.11', optional = true }
-im-rc = "12.1.0"
+im-rc = "13.0.0"
 
 # A noop dependency that changes in the Rust repository, it's a bit of a hack.
 # See the `src/tools/rustc-workspace-hack/README.md` file in `rust-lang/rust`