diff --git a/.circleci/build_win.ps1 b/.circleci/build_win.ps1
deleted file mode 100644
index e95caa7c1cf6..000000000000
--- a/.circleci/build_win.ps1
+++ /dev/null
@@ -1,26 +0,0 @@
-$ErrorActionPreference = "Stop"
-
-cd "$PSScriptRoot\.."
-
-if ("$Env:FORCE_RELEASE" -Or "$Env:CIRCLE_TAG") {
-	New-Item prerelease.txt -type file
-	Write-Host "Building release version."
-}
-else {
-	# Use last commit date rather than build date to avoid ending up with builds for
-	# different platforms having different version strings (and therefore producing different bytecode)
-	# if the CI is triggered just before midnight.
-	$last_commit_timestamp = git log -1 --date=unix --format=%cd HEAD
-	$last_commit_date = (Get-Date -Date "1970-01-01 00:00:00Z").toUniversalTime().addSeconds($last_commit_timestamp).ToString("yyyy.M.d")
-	-join("ci.", $last_commit_date) | out-file -encoding ascii prerelease.txt
-}
-
-mkdir build
-cd build
-$boost_dir=(Resolve-Path $PSScriptRoot\..\deps\boost\lib\cmake\Boost-*)
-..\deps\cmake\bin\cmake -G "Visual Studio 16 2019" -DBoost_DIR="$boost_dir\" -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded -DCMAKE_INSTALL_PREFIX="$PSScriptRoot\..\upload" ..
-if ( -not $? ) { throw "CMake configure failed." }
-msbuild solidity.sln /p:Configuration=Release /m:10 /v:minimal
-if ( -not $? ) { throw "Build failed." }
-..\deps\cmake\bin\cmake --build . -j 10 --target install --config Release
-if ( -not $? ) { throw "Install target failed." }
diff --git a/.circleci/config.yml b/.circleci/config.yml
index 0931fae8e832..0b526ae70d59 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -1640,8 +1640,7 @@ jobs:
             - .\deps
       - run:
           name: "Building solidity"
-          command: .circleci/build_win.ps1
-          shell: powershell.exe
+          command: scripts/ci/build_win.sh
       - run:
           name: "Run solc.exe to make sure build was successful."
           command: .\build\solc\Release\solc.exe --version
diff --git a/scripts/ci/build_win.sh b/scripts/ci/build_win.sh
new file mode 100755
index 000000000000..647cb02d95b6
--- /dev/null
+++ b/scripts/ci/build_win.sh
@@ -0,0 +1,46 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+(( $# <= 1 )) || { >&2 echo "Usage: $0 [PRERELEASE_SOURCE]"; exit 1; }
+prerelease_source="${1:-ci}"
+ROOTDIR="$(realpath "$(dirname "$0")/../../")"
+FORCE_RELEASE="${FORCE_RELEASE:-}"
+CIRCLE_TAG="${CIRCLE_TAG:-}"
+
+cd "$ROOTDIR"
+if [[ $FORCE_RELEASE != "" || $CIRCLE_TAG != "" ]]; then
+    echo -n > prerelease.txt
+else
+    # Use last commit date rather than build date to avoid ending up with builds for
+    # different platforms having different version strings (and therefore producing different bytecode)
+    # if the CI is triggered just before midnight.
+    # NOTE: The -local suffix makes git not use the timezone from the commit but instead convert to
+    # local one, which we explicitly set to UTC.
+    # NOTE: git --date is supposed to support the %-m/%-d format too, but it does not seem to
+    # work on Windows. Without it we get leading zeros for month and day.
+    last_commit_date=$(TZ=UTC git show --quiet --date="format-local:%Y-%m-%d" --format="%cd")
+    last_commit_date_stripped=$(date --date="$last_commit_date" "+%Y.%-m.%-d")
+    echo -n "${prerelease_source}.${last_commit_date_stripped}" > prerelease.txt
+fi
+
+mkdir -p build/
+cd build/
+
+# NOTE: Using an array to force Bash to do wildcard expansion
+boost_dir=("${ROOTDIR}/deps/boost/lib/cmake/Boost-"*)
+
+"${ROOTDIR}/deps/cmake/bin/cmake" \
+    -G "Visual Studio 16 2019" \
+    -DBoost_DIR="${boost_dir[*]}" \
+    -DCMAKE_MSVC_RUNTIME_LIBRARY=MultiThreaded \
+    -DCMAKE_INSTALL_PREFIX="${ROOTDIR}/uploads/" \
+    ..
+MSBuild.exe solidity.sln \
+    -property:Configuration=Release \
+    -maxCpuCount:10 \
+    -verbosity:minimal
+"${ROOTDIR}/deps/cmake/bin/cmake" \
+    --build . \
+    -j 10 \
+    --target install \
+    --config Release
diff --git a/scripts/install_cmake.sh b/scripts/install_cmake.sh
deleted file mode 100755
index 0533de7234e4..000000000000
--- a/scripts/install_cmake.sh
+++ /dev/null
@@ -1,40 +0,0 @@
-#!/usr/bin/env sh
-
-# This script downloads the CMake binary and installs it in ~/.local directory
-# (the cmake executable will be in ~/.local/bin).
-# This is mostly suitable for CIs, not end users.
-
-set -eu
-
-VERSION_MAJOR=3
-VERSION_MINOR=15
-VERSION_MICRO=2
-VERSION=$VERSION_MAJOR.$VERSION_MINOR.$VERSION_MICRO
-PREFIX="/usr/local"
-
-OS=$(uname -s)
-case $OS in
-Linux)  SHA256=f8cbec2abc433938bd9378b129d1d288bb33b8b5a277afe19644683af6e32a59;;
-Darwin) SHA256=7ec056d641b8cbea98b220efdcc99da1991758a370063dcac3a0cd388d6b30b6;;
-esac
-
-BIN=$PREFIX/bin
-
-PATH=$PREFIX/bin:$PATH
-
-if test -f $BIN/cmake && ($BIN/cmake --version | grep -q "$VERSION"); then
-    echo "CMake $VERSION already installed in $BIN"
-else
-    FILE=cmake-$VERSION-$OS-x86_64.tar.gz
-    URL=https://cmake.org/files/v$VERSION_MAJOR.$VERSION_MINOR/$FILE
-    TMPFILE=$(mktemp --tmpdir "cmake-$VERSION-$OS-x86_64.XXXXXXXX.tar.gz")
-    echo "Downloading CMake ($URL)..."
-    wget "$URL" -O "$TMPFILE" -nv
-    if ! (shasum -a256 "$TMPFILE" | grep -q "$SHA256"); then
-        echo "Checksum mismatch ($TMPFILE)"
-        exit 1
-    fi
-    mkdir -p "$PREFIX"
-    tar xzf "$TMPFILE" -C "$PREFIX" --strip 1
-    rm "$TMPFILE"
-fi