diff --git a/.gitea/workflows/ci.yml b/.gitea/workflows/ci.yml
index 5637fd17..c2f70997 100644
--- a/.gitea/workflows/ci.yml
+++ b/.gitea/workflows/ci.yml
@@ -56,7 +56,15 @@ jobs:
       # pinned version itself. Version is read from package.json's
       # packageManager field so it cannot drift from the lockfile.
       - name: Install pnpm (version from packageManager field)
-        run: npm install -g "pnpm@$(node -p "require('./package.json').packageManager.split('@')[1].split('+')[0]")"
+        # The runner's cached Node toolchain keeps a corepack `pnpm` shim from
+        # earlier runs, and npm refuses to overwrite it (EEXIST, run #1855) —
+        # drop the shim first so the real binary lands.
+        run: |
+          B="$(dirname "$(command -v node)")"
+          corepack disable pnpm 2>/dev/null || true
+          rm -f "$B/pnpm" "$B/pnpx"
+          npm install -g "pnpm@$(node -p "require('./package.json').packageManager.split('@')[1].split('+')[0]")"
+          pnpm --version
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
@@ -125,7 +133,15 @@ jobs:
       # pinned version itself. Version is read from package.json's
       # packageManager field so it cannot drift from the lockfile.
       - name: Install pnpm (version from packageManager field)
-        run: npm install -g "pnpm@$(node -p "require('./package.json').packageManager.split('@')[1].split('+')[0]")"
+        # The runner's cached Node toolchain keeps a corepack `pnpm` shim from
+        # earlier runs, and npm refuses to overwrite it (EEXIST, run #1855) —
+        # drop the shim first so the real binary lands.
+        run: |
+          B="$(dirname "$(command -v node)")"
+          corepack disable pnpm 2>/dev/null || true
+          rm -f "$B/pnpm" "$B/pnpx"
+          npm install -g "pnpm@$(node -p "require('./package.json').packageManager.split('@')[1].split('+')[0]")"
+          pnpm --version
 
       - name: Install dependencies
         run: pnpm install --frozen-lockfile