diff --git a/Makefile b/Makefile
index f14cad4..159e4c3 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ RUST_TOOLCHAIN ?= 1.40.0
 TOOLCHAIN = $(RUST_TOOLCHAIN)
 CARGO = $(RUSTUP) run --install $(TOOLCHAIN) cargo --color always
 
-NIGHTLY_TOOLCHAIN = nightly-2019-12-30
+NIGHTLY_TOOLCHAIN = nightly-2020-04-10
 CARGO_NIGHTLY = $(RUSTUP) run --install $(NIGHTLY_TOOLCHAIN) cargo --color always
 
 GIT_HOOKS_PATH = ".githooks"
diff --git a/tests/rfc003_bitcoin_htlc.rs b/tests/rfc003_bitcoin_htlc.rs
index d0c5ef9..9783929 100644
--- a/tests/rfc003_bitcoin_htlc.rs
+++ b/tests/rfc003_bitcoin_htlc.rs
@@ -153,7 +153,7 @@ fn redeem_htlc_with_secret() {
         inputs: vec![PrimedInput::new(
             vout,
             input_amount,
-            htlc.unlock_with_secret(&crate::ethereum_helper::SECP, secret_key, SECRET.clone()),
+            htlc.unlock_with_secret(&crate::ethereum_helper::SECP, secret_key, *SECRET),
         )],
         output_address: alice_addr.clone(),
     }