diff --git a/Cargo.toml b/Cargo.toml
index 3fe858369..15564def5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,7 +24,7 @@ default = ["std"]
 std = []
 
 [dependencies]
-serde = { version = "1.0.60", optional = true, default-features = false, features = ["alloc"] }
+serde = { version = "1.0.70", optional = true, default-features = false, features = ["alloc"] }
 # Use portable-atomic crate to support platforms without atomic CAS.
 # See "no_std support" section in readme for more information.
 #
diff --git a/ci/test-stable.sh b/ci/test-stable.sh
index ad9757449..bc95d0c1d 100755
--- a/ci/test-stable.sh
+++ b/ci/test-stable.sh
@@ -11,7 +11,7 @@ cargo hack "${cmd}" --each-feature --optional-deps
 # Run with all features
 cargo "${cmd}" --all-features
 
-if [[ "${RUST_VERSION}" == "nightly"* ]]; then
+if [[ "$(rustc --version)" == *"nightly"* ]]; then
     # Check benchmarks
     cargo check --benches