diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 732e3bb8c1..c4f7f9da36 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -339,16 +339,41 @@ jobs:
       - uses: actions/cache@v3
         with:
           path: ${{ env.DEPS_BUILD_DIR }}
-          key: windows-${{ hashFiles('cmake.deps/**', 'ci/build.ps1') }}
+          key: windows-${{ hashFiles('cmake.deps/**') }}
+
+      - name: Set env
+        run: ./.github/workflows/env.ps1
 
       - name: Build deps
-        run: .\ci\build.ps1 -BuildDeps
+        run: |
+          cmake -S cmake.deps -B $env:DEPS_BUILD_DIR -G Ninja -DCMAKE_BUILD_TYPE='RelWithDebInfo'
+          cmake --build $env:DEPS_BUILD_DIR
 
       - name: Build nvim
-        run: .\ci\build.ps1 -Build
+        run: |
+          cmake -B build -G Ninja -DCMAKE_BUILD_TYPE='RelWithDebInfo' -DDEPS_PREFIX="$env:DEPS_PREFIX"
+          cmake --build build
 
       - name: Install test deps
-        run: .\ci\build.ps1 -EnsureTestDeps
+        run: |
+          & build\bin\nvim.exe "--version"
+
+          # Ensure that the "win32" feature is set.
+          & build\bin\nvim -u NONE --headless -c 'exe !has(\"win32\").\"cq\"'
+
+          python -m pip install pynvim
+          # Sanity check
+          python -c "import pynvim; print(str(pynvim))"
+
+          gem.cmd install --pre neovim
+          Get-Command -CommandType Application neovim-ruby-host.bat
+
+          node --version
+          npm.cmd --version
+
+          npm.cmd install -g neovim
+          Get-Command -CommandType Application neovim-node-host.cmd
+          npm.cmd link neovim
 
       - if: "!cancelled()"
         name: Determine if run should be aborted
@@ -357,9 +382,15 @@ jobs:
           "status=${{ job.status }}" >> $env:GITHUB_OUTPUT
 
       - if: success() || failure() && steps.abort_job.outputs.status == 'success'
-        name: Run tests
-        run: .\ci\build.ps1 -Test
+        name: Run functionaltests
+        run: cmake --build build --target functionaltest
 
       - if: success() || failure() && steps.abort_job.outputs.status == 'success'
-        name: Run old tests
-        run: .\ci\build.ps1 -TestOld
+        name: Run oldtests
+        run: |
+          # Add MSYS to path, required for e.g. `find` used in test scripts.
+          # But would break functionaltests, where its `more` would be used then.
+          $OldPath = $env:PATH
+          $env:PATH = "C:\msys64\usr\bin;$env:PATH"
+          & "C:\msys64\mingw64\bin\mingw32-make.exe" -C $(Convert-Path src\nvim\testdir) VERBOSE=1
+          $env:PATH = $OldPath
diff --git a/.github/workflows/env.ps1 b/.github/workflows/env.ps1
new file mode 100644
index 0000000000..8ac267f2f9
--- /dev/null
+++ b/.github/workflows/env.ps1
@@ -0,0 +1,7 @@
+$installationPath = vswhere.exe -latest -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath
+if ($installationPath -and (Test-Path "$installationPath\Common7\Tools\vsdevcmd.bat")) {
+  & "${env:COMSPEC}" /s /c "`"$installationPath\Common7\Tools\vsdevcmd.bat`" -arch=x64 -no_logo && set" | ForEach-Object {
+    $name, $value = $_ -split '=', 2
+    "$name=$value" >> $env:GITHUB_ENV
+  }
+}
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 1444109eae..1c033fc1dc 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -150,10 +150,16 @@ jobs:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 0
+      - name: Set env
+        run: ./.github/workflows/env.ps1
       - name: Build deps
-        run: .\ci\build.ps1 -BuildDeps
+        run: |
+          cmake -S cmake.deps -B $env:DEPS_BUILD_DIR -G Ninja -DCMAKE_BUILD_TYPE='RelWithDebInfo'
+          cmake --build $env:DEPS_BUILD_DIR
       - name: build package
-        run: .\ci\build.ps1 -Package
+        run: |
+          cmake -B build -G Ninja -DCMAKE_BUILD_TYPE='RelWithDebInfo' -DDEPS_PREFIX="$env:DEPS_PREFIX"
+          cmake --build build --target package
       - uses: actions/upload-artifact@v3
         with:
           name: nvim-win64
diff --git a/ci/build.ps1 b/ci/build.ps1
deleted file mode 100644
index 2340c2273f..0000000000
--- a/ci/build.ps1
+++ /dev/null
@@ -1,97 +0,0 @@
-[CmdletBinding(DefaultParameterSetName = "Build")]
-param(
-  [Parameter(ParameterSetName="Build")][switch]$Build,
-  [Parameter(ParameterSetName="BuildDeps")][switch]$BuildDeps,
-  [Parameter(ParameterSetName="EnsureTestDeps")][switch]$EnsureTestDeps,
-  [Parameter(ParameterSetName="Package")][switch]$Package,
-  [Parameter(ParameterSetName="Test")][switch]$Test,
-  [Parameter(ParameterSetName="TestOld")][switch]$TestOld
-)
-
-Set-StrictMode -Version Latest
-$ErrorActionPreference = 'Stop'
-$ProgressPreference = 'SilentlyContinue'
-
-$projectDir = [System.IO.Path]::GetFullPath("$(Get-Location)")
-$buildDir = Join-Path -Path $projectDir -ChildPath "build"
-
-function exitIfFailed() {
-  if ($LastExitCode -ne 0) {
-    exit $LastExitCode
-  }
-}
-
-$installationPath = vswhere.exe -latest -requires Microsoft.VisualStudio.Component.VC.Tools.x86.x64 -property installationPath
-if ($installationPath -and (Test-Path "$installationPath\Common7\Tools\vsdevcmd.bat")) {
-  & "${env:COMSPEC}" /s /c "`"$installationPath\Common7\Tools\vsdevcmd.bat`" -arch=x64 -no_logo && set" | ForEach-Object {
-    $name, $value = $_ -split '=', 2
-    Set-Content env:\"$name" $value
-  }
-}
-
-function BuildDeps {
-  cmake -S "$projectDir\cmake.deps" -B $env:DEPS_BUILD_DIR -G Ninja -DCMAKE_BUILD_TYPE='RelWithDebInfo'; exitIfFailed
-  cmake --build $env:DEPS_BUILD_DIR; exitIfFailed
-}
-
-function Build {
-  cmake -S $projectDir -B $buildDir -G Ninja -DCMAKE_BUILD_TYPE='RelWithDebInfo' -DDEPS_PREFIX="$env:DEPS_PREFIX"; exitIfFailed
-  cmake --build $buildDir; exitIfFailed
-}
-
-function EnsureTestDeps {
-  & $buildDir\bin\nvim.exe "--version"; exitIfFailed
-
-  # Ensure that the "win32" feature is set.
-  & $buildDir\bin\nvim -u NONE --headless -c 'exe !has(\"win32\").\"cq\"' ; exitIfFailed
-
-  python -m pip install pynvim
-  # Sanity check
-  python -c "import pynvim; print(str(pynvim))"; exitIfFailed
-
-  gem.cmd install --pre neovim
-  Get-Command -CommandType Application neovim-ruby-host.bat; exitIfFailed
-
-  node --version
-  npm.cmd --version
-
-  npm.cmd install -g neovim; exitIfFailed
-  Get-Command -CommandType Application neovim-node-host.cmd; exitIfFailed
-  npm.cmd link neovim
-}
-
-function Test {
-  # Functional tests
-  # The $LastExitCode from MSBuild can't be trusted
-  $failed = $false
-
-  # Run only this test file:
-  # $env:TEST_FILE = "test\functional\foo.lua"
-  cmake --build $buildDir --target functionaltest 2>&1 |
-    ForEach-Object { $failed = $failed -or
-      $_ -match 'functional tests failed with error'; $_ }
-
-  if ($failed) {
-    exit $LastExitCode
-  }
-}
-
-function TestOld {
-  # Old tests
-  # Add MSYS to path, required for e.g. `find` used in test scripts.
-  # But would break functionaltests, where its `more` would be used then.
-  $OldPath = $env:PATH
-  $env:PATH = "C:\msys64\usr\bin;$env:PATH"
-  & "C:\msys64\mingw64\bin\mingw32-make.exe" -C $(Convert-Path $projectDir\src\nvim\testdir) VERBOSE=1; exitIfFailed
-  $env:PATH = $OldPath
-}
-
-function Package {
-  cmake -S $projectDir -B $buildDir -G Ninja -DCMAKE_BUILD_TYPE='RelWithDebInfo' -DDEPS_PREFIX="$env:DEPS_PREFIX"; exitIfFailed
-  cmake --build $buildDir --target package; exitIfFailed
-}
-
-if ($PSCmdlet.ParameterSetName) {
-  & (Get-ChildItem "Function:$($PSCmdlet.ParameterSetName)")
-  exit
-}