diff --git a/Cargo.toml b/Cargo.toml
index fcc7d175..abda2479 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,12 +20,9 @@ name = "chrono"
 # Don't forget to adjust `ALL_NON_EXCLUSIVE_FEATURES` in CI scripts when adding a feature or an optional dependency.
 default = ["clock", "std"]
 alloc = []
-libc = []
-winapi = ["windows-targets"]
 std = ["alloc"]
-clock = ["winapi", "iana-time-zone", "android-tzdata", "now"]
+clock = ["windows-targets", "iana-time-zone", "android-tzdata", "now"]
 now = ["std"]
-oldtime = []
 wasmbind = ["wasm-bindgen", "js-sys"]
 unstable-locales = ["pure-rust-locales"]
 # Note that rkyv-16, rkyv-32, and rkyv-64 are mutually exclusive.