diff --git a/CHANGELOG.md b/CHANGELOG.md
index db237ac..319c1f2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -102,6 +102,13 @@ changes listed under Unreleased above as of this tag.
   the Homebrew tap and Scoop bucket. The `cli-v*` tags and GitHub releases are retired; `scripts/install.sh`,
   the formula and the Scoop manifest download from `https://git.kof22.com/QRun-IO/qqq-cli/releases`.
 
+### Fixed
+
+- **Windows: the DPAPI keyring works when `qqq` is started from PowerShell 7.** The inherited `PSModulePath`
+  named PowerShell 7's modules, so Windows PowerShell 5.1 could not load `Microsoft.PowerShell.Security` and every
+  sign-in failed with "Windows credential protection failed". The keyring now starts PowerShell without it.
+  Found by the first native Windows release lane.
+
 ## [1.0.0] - 2026-11-01
 
 `qqq` 1.0: the command-line client and the full-screen terminal UI (`qqq ui`), shipped together as one
diff --git a/packages/core/src/session/keyring.ts b/packages/core/src/session/keyring.ts
index 25e4f80..8197e57 100644
--- a/packages/core/src/session/keyring.ts
+++ b/packages/core/src/session/keyring.ts
@@ -110,7 +110,10 @@ export class DpapiFileStore implements SecretStore {
       + '[Console]::Write((ConvertTo-Json -InputObject $qqqResult -Compress))'
     return new Promise<string>((resolve, reject) => {
       const failed = () => reject(new Error('Windows credential protection failed; check PowerShell and your Windows profile'))
-      const child = execFile(shell, ['-NoProfile', '-NonInteractive', '-Command', command], { timeout: 15000 }, (error, stdout) => {
+      // Started from PowerShell 7, the inherited PSModulePath names PowerShell 7's modules, and Windows PowerShell 5.1
+      // then cannot load Microsoft.PowerShell.Security (ConvertTo-SecureString). Without it, each shell uses its own.
+      const env = Object.fromEntries(Object.entries(process.env).filter(([name]) => name.toUpperCase() !== 'PSMODULEPATH'))
+      const child = execFile(shell, ['-NoProfile', '-NonInteractive', '-Command', command], { timeout: 15000, env }, (error, stdout) => {
         if (error) { failed(); return }
         try {
           const result: unknown = JSON.parse(stdout.trim())