diff --git a/src/tss/Dockerfile-local b/src/tss/Dockerfile-local
index 632aadf..909a9b8 100644
--- a/src/tss/Dockerfile-local
+++ b/src/tss/Dockerfile-local
@@ -10,12 +10,13 @@ ENV PATH=/root/.cargo/bin:$PATH
 WORKDIR /tss
 
 COPY ./multi-party-ecdsa/Cargo.toml /tss/
+COPY ./multi-party-ecdsa/Cargo.lock /tss/
 COPY ./multi-party-ecdsa/src/lib.rs /tss/src/lib.rs
 
-RUN cargo build --release || true
+RUN cargo build --locked --release || true
 
 COPY ./multi-party-ecdsa /tss/
 
-RUN cargo build --release
+RUN cargo build --locked --release
 
 CMD echo Done
diff --git a/src/tss/multi-party-ecdsa b/src/tss/multi-party-ecdsa
index 1b71aae..8f44762 160000
--- a/src/tss/multi-party-ecdsa
+++ b/src/tss/multi-party-ecdsa
@@ -1 +1 @@
-Subproject commit 1b71aae16f2c8c497f8d10067efcf522e6ad575b
+Subproject commit 8f4476240ffcd7b651177c6f3d9849e6ef48f6a0