diff --git a/Dockerfile b/Dockerfile
index 9a4ba26..97cfc2a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,12 +1,12 @@
 
 ARG NODE_VERSION=20
-ARG RUST_TOOLCHAIN=""
 
 FROM node:${NODE_VERSION}
 
 ENV CARGO_HOME=/usr/local/cargo
 ENV RUSTUP_HOME=/usr/local/rustup
 ENV PATH=/usr/local/cargo/bin:$PATH
+ENV PKG_CONFIG_SYSROOT_DIR=/
 
 RUN apt update && apt upgrade -y
 RUN apt install -y g++-mingw-w64-x86-64 \
@@ -22,13 +22,3 @@ ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc \
 ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc \
 	CC_aarch64_unknown_linux_gnu=aarch64-linux-gnu-gcc \
 	CXX_aarch64_unknown_linux_gnu=aarch64-linux-gnu-g++
-
-RUN if test "${RUST_TOOLCHAIN}x" != "x" ; \
-	then rustup toolchain install $RUST_TOOLCHAIN ; \
-	fi
-
-RUN rustup target add x86_64-pc-windows-gnu
-RUN rustup target add x86_64-unknown-linux-gnu
-RUN rustup target add armv7-unknown-linux-gnueabihf
-RUN rustup target add aarch64-unknown-linux-gnu
-RUN rustup target add wasm32-unknown-unknown
diff --git a/readme.md b/readme.md
index 2a0b030..c6ef12f 100644
--- a/readme.md
+++ b/readme.md
@@ -33,5 +33,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Build
-        run: cargo build --target ${{ matrix.rust-target }}
+        run: |
+          rustup target add ${{ matrix.rust-target }}
+          cargo build --target ${{ matrix.rust-target }}
 ```