diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index d2546cd..f46a7b0 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -24,3 +24,18 @@ jobs:
         run: |
           & powershell.exe -NoProfile -ExecutionPolicy Bypass -File .\ParallelKit.Harness.ps1
           exit $LASTEXITCODE
+
+  # PowerShell 7 isn't a supported target. This job is informational, to see
+  # whether the kit keeps working there; it isn't a required check.
+  harness-pwsh:
+    name: Harness (PowerShell 7)
+    runs-on: windows-latest
+    timeout-minutes: 15
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Run ParallelKit.Harness.ps1 under pwsh
+        shell: pwsh
+        run: |
+          & pwsh -NoProfile -ExecutionPolicy Bypass -File .\ParallelKit.Harness.ps1
+          exit $LASTEXITCODE
diff --git a/ParallelKit.Harness.ps1 b/ParallelKit.Harness.ps1
index 39bfebe..fdc9c5f 100644
--- a/ParallelKit.Harness.ps1
+++ b/ParallelKit.Harness.ps1
@@ -43,6 +43,9 @@ function New-JobList {
 }
 
 $cmdExe  = Join-Path $env:SystemRoot "System32\cmd.exe"
+# Whichever PowerShell is running the harness (powershell.exe or pwsh.exe),
+# for the tests that need a fresh process of the same version.
+$selfExe = [System.Diagnostics.Process]::GetCurrentProcess().MainModule.FileName
 $pingExe = Join-Path $env:SystemRoot "System32\ping.exe"
 
 # A user function the workers share.
@@ -681,7 +684,7 @@ $kitPath = Join-Path $PSScriptRoot "ParallelKit.ps1"
 [System.Threading.ThreadPool]::GetMinThreads([ref]`$w, [ref]`$io)
 Write-Output ("before=" + `$before + " after=" + [PkChildProcessJob]::IsInitialized + " threads=" + `$w)
 "@)
-$probe = Invoke-PkProcessWithTimeout -FilePath (Join-Path $PSHOME "powershell.exe") -Arguments ('-NoProfile -ExecutionPolicy Bypass -File "' + $probeScript + '"') -TimeoutMs 60000
+$probe = Invoke-PkProcessWithTimeout -FilePath $selfExe -Arguments ('-NoProfile -ExecutionPolicy Bypass -File "' + $probeScript + '"') -TimeoutMs 60000
 [System.IO.File]::Delete($probeScript)
 Test-Assert ($probe.Stdout -match 'before=False after=True') ("starting a process sets up child cleanup by itself (" + ([string]$probe.Stdout).Trim() + ")")
 $probeThreads = 0
@@ -973,7 +976,7 @@ $staleScript = Join-Path $env:TEMP ("pk-stale-" + [guid]::NewGuid().ToString("N"
 Add-Type -TypeDefinition 'public static class PkConsoleCtrl { } public static class PkState { }'
 try { . '$kitPath'; Write-Output 'LOADED' } catch { Write-Output ('REFUSED: ' + `$_) }
 "@)
-$stale = Invoke-PkProcessWithTimeout -FilePath (Join-Path $PSHOME "powershell.exe") -Arguments ('-NoProfile -ExecutionPolicy Bypass -File "' + $staleScript + '"') -TimeoutMs 60000
+$stale = Invoke-PkProcessWithTimeout -FilePath $selfExe -Arguments ('-NoProfile -ExecutionPolicy Bypass -File "' + $staleScript + '"') -TimeoutMs 60000
 [System.IO.File]::Delete($staleScript)
 Test-Assert ($stale.Stdout -like '*REFUSED:*older version of the kit*start a new one*') "loading the kit over an older copy's types is refused with a clear message"