diff --git a/Cargo.toml b/Cargo.toml
index fcbf6ddd8..e8c023de3 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ dyn-cache = { path = "dyn-cache", version = "0.12.0"}
 futures = "0.3.5"
 illicit = { path = "illicit", version = "1.1.1"}
 moxie-macros = { path = "macros", version = "0.1.0-pre" }
-parking_lot = "0.11"
+simple-mutex = "1.1.5"
 scopeguard = "1"
 topo = { path = "topo", version = "0.13.0"}
 tracing = "^0.1"
diff --git a/dyn-cache/Cargo.toml b/dyn-cache/Cargo.toml
index 9229b855f..b1daa9160 100644
--- a/dyn-cache/Cargo.toml
+++ b/dyn-cache/Cargo.toml
@@ -18,7 +18,7 @@ downcast-rs = "1.1.1"
 hash_hasher = "2.0.3"
 hashbrown = "0.9.0"
 illicit = { path = "../illicit", version = "1.1.1"}
-parking_lot = "0.11.0"
+simple-mutex = "1.1.5"
 paste = "1.0.0"
 
 [dev-dependencies]
diff --git a/dyn-cache/src/definition.rs b/dyn-cache/src/definition.rs
index 8f3de3418..8a0042922 100644
--- a/dyn-cache/src/definition.rs
+++ b/dyn-cache/src/definition.rs
@@ -379,7 +379,7 @@ impl std::panic::RefUnwindSafe for $shared {}
 mod $test_mod {
     use super::*;
     use std::sync::Arc;
-    use parking_lot::Mutex;
+    use simple_mutex::Mutex;
 
     #[test]
     fn single_query_with_gc() {
diff --git a/dyn-cache/src/dep_node.rs b/dyn-cache/src/dep_node.rs
index b5d807acd..f029eb224 100644
--- a/dyn-cache/src/dep_node.rs
+++ b/dyn-cache/src/dep_node.rs
@@ -1,6 +1,6 @@
 use super::Liveness;
 use illicit::AsContext;
-use parking_lot::Mutex;
+use simple_mutex::Mutex;
 use std::{
     cmp::Ordering,
     hash::{Hash, Hasher},
diff --git a/dyn-cache/src/lib.rs b/dyn-cache/src/lib.rs
index b9d18ae93..5b09b55ad 100644
--- a/dyn-cache/src/lib.rs
+++ b/dyn-cache/src/lib.rs
@@ -423,7 +423,7 @@ pub mod local {
 
 /// A thread-safe cache which requires stored types implement `Send`.
 pub mod sync {
-    use parking_lot::Mutex;
+    use simple_mutex::Mutex;
     use std::sync::Arc;
 
     define_cache!(sync, SendCache: Send, Arc, Mutex::lock);
diff --git a/src/lib.rs b/src/lib.rs
index 2ef4e8d10..09224378a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -60,7 +60,7 @@ pub mod runtime;
 pub mod testing;
 
 use crate::runtime::{Context, Var};
-use parking_lot::Mutex;
+use simple_mutex::Mutex;
 use std::{
     borrow::Borrow,
     fmt::{Debug, Display, Formatter, Result as FmtResult},
diff --git a/src/runtime/var.rs b/src/runtime/var.rs
index e9334464b..d3d0901e4 100644
--- a/src/runtime/var.rs
+++ b/src/runtime/var.rs
@@ -1,5 +1,5 @@
 use crate::{Commit, Key};
-use parking_lot::Mutex;
+use simple_mutex::Mutex;
 use std::{sync::Arc, task::Waker};
 
 /// The underlying container of state variables. Vends copies of the latest
diff --git a/topo/Cargo.toml b/topo/Cargo.toml
index 9f67177c0..1190f4f54 100644
--- a/topo/Cargo.toml
+++ b/topo/Cargo.toml
@@ -17,7 +17,7 @@ edition = "2018"
 dyn-cache = { path = "../dyn-cache", version = "0.12.0"}
 illicit = { path = "../illicit", version = "1.1.1"}
 once_cell = "1.4.0"
-parking_lot = "0.11.0"
+simple-mutex = "1.1.5"
 topo-macro = { path = "macro", version = "0.10.0"}
 
 [dev-dependencies]
diff --git a/topo/src/slot.rs b/topo/src/slot.rs
index 74ee24b0e..1a6d45a30 100644
--- a/topo/src/slot.rs
+++ b/topo/src/slot.rs
@@ -1,6 +1,6 @@
 use dyn_cache::sync::SendCache;
 use once_cell::sync::Lazy;
-use parking_lot::Mutex;
+use simple_mutex::Mutex;
 use std::{
     any::{type_name, TypeId},
     borrow::Borrow,