diff --git a/Dockerfile b/Dockerfile
index d3b80fb..fff87d3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -20,7 +20,8 @@ cargo new --bin crates/ptth_server && \
 cargo new --bin crates/ptth_file_server_bin && \
 cargo new --bin tools/ptth_tail && \
 cargo new --bin crates/debug_proxy && \
-cargo new --bin crates/ptth_quic
+cargo new --bin crates/ptth_quic && \
+cargo new --lib crates/udp_over_tcp
 
 # copy over your manifests
 COPY ./Cargo.lock                               ./
@@ -29,6 +30,7 @@ COPY ./crates/always_equal/Cargo.toml           ./crates/always_equal/
 COPY ./crates/ptth_core/Cargo.toml              ./crates/ptth_core/
 COPY ./crates/ptth_relay/Cargo.toml             ./crates/ptth_relay/
 COPY ./crates/ptth_quic/Cargo.toml              ./crates/ptth_quic/
+COPY ./crates/udp_over_tcp/Cargo.toml           ./crates/udp_over_tcp/
 
 # this build step will cache your dependencies
 RUN cargo build --release -p ptth_relay