diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index c93fae75..a3f6b700 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -15,9 +15,6 @@ jobs:
     - name: Install hub
       run: ci/install-hub.sh ${{ matrix.os }}
       shell: bash
-    - name: Install Rustup
-      run: ci/install-rustup.sh stable
-      shell: bash
     - name: Install Rust
       run: ci/install-rust.sh stable
       shell: bash
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index fb610ad5..5ced8e95 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -34,8 +34,6 @@ jobs:
             rust: 1.35.0
     steps:
     - uses: actions/checkout@master
-    - name: Install Rustup
-      run: bash ci/install-rustup.sh ${{ matrix.rust }}
     - name: Install Rust
       run: bash ci/install-rust.sh ${{ matrix.rust }}
     - name: Build and run tests
diff --git a/ci/install-rustup.sh b/ci/install-rustup.sh
deleted file mode 100755
index 2d3dded5..00000000
--- a/ci/install-rustup.sh
+++ /dev/null
@@ -1,26 +0,0 @@
-#!/usr/bin/env bash
-# Install/update rustup.
-# The first argument should be the toolchain to install.
-#
-# It is helpful to have this as a separate script due to some issues on
-# Windows where immediately after `rustup self update`, rustup can fail with
-# "Device or resource busy".
-
-set -ex
-if [ -z "$1" ]
-then
-    echo "First parameter must be toolchain to install."
-    exit 1
-fi
-TOOLCHAIN="$1"
-
-# Install/update rustup.
-if command -v rustup
-then
-    echo `command -v rustup` `rustup -V` already installed
-    rustup self update
-else
-    # macOS currently does not have rust pre-installed.
-    curl https://sh.rustup.rs -sSf | sh -s -- -y --default-toolchain $TOOLCHAIN --profile=minimal
-    echo "##[add-path]$HOME/.cargo/bin"
-fi