diff --git a/renovate-presets/fleet.json b/renovate-presets/fleet.json
new file mode 100644
index 000000000..eb9cf3777
--- /dev/null
+++ b/renovate-presets/fleet.json
@@ -0,0 +1,34 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "description": "stranske fleet-shared Renovate preset — single source of truth for dependency automation across all stranske/* repos. Replaces Dependabot for runtime pip deps + GitHub Actions, grouped with automerge-on-green. Dev-tool pins (ruff/black/mypy/pytest/...) are EXCLUDED: they move through autofix-versions.env via the maint workflows, NOT the bumper (mirrors the retired Dependabot ignore list). The vendored .github/scripts npm cascade (minimatch/brace-expansion/balanced-match) is kept in one PR. Each repo's renovate.json extends this via `github>stranske/Workflows//renovate-presets/fleet`, so a fleet-wide policy change is one edit here — no per-repo re-sync.",
+  "extends": ["config:recommended"],
+  "platformAutomerge": true,
+  "labels": ["dependencies"],
+  "packageRules": [
+    {
+      "description": "Dev-tool pins are owned by autofix-versions.env + the maint workflows — Renovate must not bump them",
+      "matchPackageNames": ["ruff", "black", "mypy", "pytest", "pytest-cov", "pytest-xdist", "coverage", "isort", "docformatter"],
+      "enabled": false
+    },
+    {
+      "description": "Runtime/test-support minor+patch: group + automerge on green (majors stay separate for review)",
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "non-major updates",
+      "automerge": true,
+      "automergeType": "pr"
+    },
+    {
+      "description": "GitHub Actions minor+patch: group + automerge on green",
+      "matchManagers": ["github-actions"],
+      "matchUpdateTypes": ["minor", "patch"],
+      "groupName": "github-actions",
+      "automerge": true
+    },
+    {
+      "description": "Vendored minimatch cascade — keep minimatch, brace-expansion, balanced-match in one PR",
+      "matchFileNames": [".github/scripts/**"],
+      "matchPackageNames": ["minimatch", "brace-expansion", "balanced-match"],
+      "groupName": "vendored minimatch cascade"
+    }
+  ]
+}
diff --git a/renovate.json b/renovate.json
index 1b2971db3..c743ffb68 100644
--- a/renovate.json
+++ b/renovate.json
@@ -1,34 +1,5 @@
 {
   "$schema": "https://docs.renovatebot.com/renovate-schema.json",
-  "description": "Workflows Renovate config — replaces Dependabot for runtime pip deps + GitHub Actions, grouped with automerge-on-green. Shared dev-tool pins (ruff/black/mypy/pytest/...) are EXCLUDED here: they move through autofix-versions.env via maint-auto-update-pypi-versions.yml + maint-51-dependency-refresh.yml, NOT the bumper (mirrors the retired dependabot ignore list).",
-  "extends": ["config:recommended"],
-  "platformAutomerge": true,
-  "labels": ["dependencies"],
-  "packageRules": [
-    {
-      "description": "Dev-tool pins are owned by autofix-versions.env + the maint workflows — Renovate must not bump them",
-      "matchPackageNames": ["ruff", "black", "mypy", "pytest", "pytest-cov", "pytest-xdist", "coverage", "isort", "docformatter"],
-      "enabled": false
-    },
-    {
-      "description": "Runtime/test-support minor+patch: group + automerge on green (majors stay separate for review)",
-      "matchUpdateTypes": ["minor", "patch"],
-      "groupName": "non-major updates",
-      "automerge": true,
-      "automergeType": "pr"
-    },
-    {
-      "description": "GitHub Actions minor+patch: group + automerge on green",
-      "matchManagers": ["github-actions"],
-      "matchUpdateTypes": ["minor", "patch"],
-      "groupName": "github-actions",
-      "automerge": true
-    },
-    {
-      "description": "Vendored minimatch cascade — keep minimatch, brace-expansion, balanced-match in one PR",
-      "matchFileNames": [".github/scripts/**"],
-      "matchPackageNames": ["minimatch", "brace-expansion", "balanced-match"],
-      "groupName": "vendored minimatch cascade"
-    }
-  ]
+  "description": "Workflows Renovate config — extends the stranske fleet-shared preset (renovate-presets/fleet.json), the single source of truth for grouping, automerge-on-green, dev-tool exclusions, and the vendored-minimatch cascade. Workflows dogfoods the same preset every consumer repo extends. Repo-specific overrides, if ever needed, go in packageRules below.",
+  "extends": ["github>stranske/Workflows//renovate-presets/fleet"]
 }