diff --git a/Cargo.toml b/Cargo.toml
index 048957b..28704cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -40,6 +40,7 @@ rug = "1.19.1"
 [[bench]]
 name = "fft"
 harness = false
+required-features = ["serde"]
 
 [package.metadata.docs.rs]
 all-features = true
diff --git a/toolchain.txt b/toolchain.txt
index 595cdb7..6920d07 100644
--- a/toolchain.txt
+++ b/toolchain.txt
@@ -1 +1 @@
-nightly-2023-01-30
+nightly-2024-01-04