diff --git a/ci/docker-rust-nightly/Dockerfile b/ci/docker-rust-nightly/Dockerfile
index 29f7c7d61..8972023e1 100644
--- a/ci/docker-rust-nightly/Dockerfile
+++ b/ci/docker-rust-nightly/Dockerfile
@@ -1,4 +1,4 @@
-FROM solanalabs/rust
+FROM solanalabs/rust:1.38.0
 ARG date
 
 RUN set -x \
diff --git a/ci/rust-version.sh b/ci/rust-version.sh
index 35e373774..07ca557d7 100644
--- a/ci/rust-version.sh
+++ b/ci/rust-version.sh
@@ -14,7 +14,7 @@
 #
 
 stable_version=1.38.0
-nightly_version=2019-09-25
+nightly_version=2019-10-03
 
 export rust_stable="$stable_version"
 export rust_stable_docker_image=solanalabs/rust:"$stable_version"
diff --git a/scripts/coverage.sh b/scripts/coverage.sh
index 3574895f4..d0c8435e2 100755
--- a/scripts/coverage.sh
+++ b/scripts/coverage.sh
@@ -37,8 +37,6 @@ rm -rf target/cov/$reportName
 
 source ci/rust-version.sh nightly
 # shellcheck disable=SC2086 #
-_ cargo +$rust_nightly build --tests --bins --target-dir target/cov $crate
-# shellcheck disable=SC2086 #
 _ cargo +$rust_nightly test --target-dir target/cov --lib $crate
 
 echo "--- grcov"