diff --git a/Cargo.toml b/Cargo.toml
index 414ec8d9..b70e6413 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -42,7 +42,7 @@ name = "bson"
 
 [dependencies]
 ahash = "0.7.2"
-chrono = "0.4.15"
+chrono = { version = "0.4.15", features = ["std"], default-features = false }
 rand = "0.8"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0", features = ["preserve_order"] }
@@ -59,7 +59,7 @@ criterion = "0.3.0"
 pretty_assertions = "0.6.1"
 proptest = "1.0.0"
 serde_bytes = "0.11"
-chrono = { version = "0.4", features = ["serde"] }
+chrono = { version = "0.4", features = ["serde", "clock", "std"], default-features = false }
 
 [package.metadata.docs.rs]
 all-features = true