diff --git a/Cargo.toml b/Cargo.toml
index 1701d6e1..1e0a9f9d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,6 +26,14 @@ name = "lightningcss"
 path = "src/lib.rs"
 crate-type = ["rlib"]
 
+[features]
+default = ["bundler", "grid"]
+browserslist = ["browserslist-rs"]
+bundler = ["dashmap", "rayon"]
+cli = ["clap", "serde_json", "browserslist", "jemallocator"]
+grid = []
+serde = ["smallvec/serde", "cssparser/serde"]
+
 [dependencies]
 serde = { version = "1.0.123", features = ["derive"] }
 cssparser = "0.29.1"
@@ -41,8 +49,8 @@ pathdiff = "0.2.1"
 # CLI deps
 clap = { version = "3.0.6", features = ["derive"], optional = true }
 browserslist-rs = { version = "0.7.0", optional = true }
-rayon = "1.5.1"
-dashmap = "5.0.0"
+rayon = { version = "1.5.1", optional = true }
+dashmap = { version = "5.0.0", optional = true }
 serde_json = { version = "1.0.78", optional = true }
 lightningcss-derive = { version = "1.0.0-alpha.35", path = "./derive" }
 
@@ -56,13 +64,6 @@ assert_fs = "1.0"
 predicates = "2.1"
 serde_json = "1"
 
-[features]
-default = ["grid"]
-browserslist = ["browserslist-rs"]
-cli = ["clap", "serde_json", "browserslist", "jemallocator"]
-grid = []
-serde = ["smallvec/serde", "cssparser/serde"]
-
 [[test]]
 name = "cli_integration_tests"
 path = "tests/cli_integration_tests.rs"
diff --git a/src/lib.rs b/src/lib.rs
index 7dbdfe60..0280f314 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -16,6 +16,7 @@
 
 #![deny(missing_docs)]
 
+#[cfg(feature = "bundler")]
 pub mod bundler;
 mod compat;
 mod context;