diff --git a/reverie-ptrace/Cargo.toml b/reverie-ptrace/Cargo.toml
index a1067ce..5c6dc43 100644
--- a/reverie-ptrace/Cargo.toml
+++ b/reverie-ptrace/Cargo.toml
@@ -19,7 +19,7 @@ lazy_static = "1.0"
 libc = "0.2.98"
 nix = "0.22"
 num-traits = "0.2"
-parking_lot = { version = "0.12.0", features = ["send_guard"] }
+parking_lot = { version = "0.11.2", features = ["send_guard"] }
 paste = "1.0"
 perf-event-open-sys = "1.0"
 procfs = "0.9"