diff --git a/native/Cargo.toml b/native/Cargo.toml
index d38b863..510fdc1 100755
--- a/native/Cargo.toml
+++ b/native/Cargo.toml
@@ -29,9 +29,9 @@ reduce = "0.1.2"
 serde = { version = "1.0.106", features = ["derive"] }
 bincode = "1.2.1"
 better-panic = "0.2.0"
-squaremat = { path = "./squaremat", version = "0.6" }
+squaremat = { path = "./squaremat" }
 md5 = "0.7.0"
-lbfgsb-sys = { git = "https://github.com/ethanhs/lbfgsb-sys.git", version = "0.1.0", features = ["static"], optional = true }
+lbfgsb-sys = { git = "https://github.com/ethanhs/lbfgsb-sys.git", features = ["static"], optional = true }
 rand = "0.7.3"
 
 [dependencies.pyo3]
diff --git a/native/Dockerfile b/native/Dockerfile
index d965cca..97dd331 100644
--- a/native/Dockerfile
+++ b/native/Dockerfile
@@ -7,17 +7,18 @@ ENV PATH /opt/python/cp35-cp35m/bin/:/opt/python/cp36-cp36m/bin/:/opt/python/cp3
 ENV USER root
 
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y \
-    && rustup toolchain add nightly-2020-01-23 \
+    && rustup set profile minimal \
+    && rustup toolchain add nightly-2020-04-27 \
     && python3 -m pip install --no-cache-dir cffi \
     && mkdir /io
 
 RUN git clone https://github.com/PyO3/maturin /maturin/
 
-RUN cargo +nightly-2020-01-23 rustc --bin maturin --manifest-path /maturin/Cargo.toml -- -C link-arg=-s \
+RUN cargo +nightly-2020-04-27 rustc --bin maturin --manifest-path /maturin/Cargo.toml -- -C link-arg=-s \
     && mv /maturin/target/debug/maturin /usr/bin/maturin \
     && rm -rf /maturin
 
-RUN rustup default nightly-2020-01-23
+RUN rustup default nightly-2020-04-27
 
 WORKDIR /io