diff --git a/worker/Dockerfile b/worker/Dockerfile
index 80cf540..6f04afe 100644
--- a/worker/Dockerfile
+++ b/worker/Dockerfile
@@ -44,8 +44,7 @@ RUN mkdir -p /ipfs && \
     cd go-ipfs && \
     ./install.sh
 
-# install WASM toolchain
-RUN /root/.cargo/bin/rustup target install wasm32-unknown-unknown
+RUN /root/.cargo/bin/rustup self update
 
 # install packages needed for substrate
 RUN apt-get update && \