diff --git a/.changeset/pre.json b/.changeset/pre.json
new file mode 100644
index 000000000..f15999a4d
--- /dev/null
+++ b/.changeset/pre.json
@@ -0,0 +1,25 @@
+{
+  "mode": "pre",
+  "tag": "rc",
+  "initialVersions": {
+    "@cipherstash/e2e": "0.0.2",
+    "@cipherstash/basic-example": "1.2.13",
+    "@cipherstash/prisma-next-example": "0.0.5",
+    "@cipherstash/supabase-worker-example": "0.0.0",
+    "@cipherstash/bench": "0.0.4",
+    "stash": "0.17.1",
+    "@cipherstash/drizzle": "3.0.3",
+    "@cipherstash/migrate": "0.2.0",
+    "@cipherstash/nextjs": "4.1.1",
+    "@cipherstash/prisma-next": "0.3.2",
+    "@cipherstash/protect": "12.0.1",
+    "@cipherstash/protect-dynamodb": "12.0.1",
+    "@cipherstash/schema": "3.0.1",
+    "@cipherstash/stack": "0.19.0",
+    "@cipherstash/stack-drizzle": "0.0.0",
+    "@cipherstash/stack-supabase": "0.0.0",
+    "@cipherstash/test-kit": "0.0.0",
+    "@cipherstash/wizard": "0.4.0"
+  },
+  "changesets": []
+}
diff --git a/.changeset/stack-1-0-0-rc.md b/.changeset/stack-1-0-0-rc.md
new file mode 100644
index 000000000..555ae5c8e
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+++ b/.changeset/stack-1-0-0-rc.md
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+---
+'@cipherstash/stack': major
+'@cipherstash/stack-drizzle': major
+'@cipherstash/stack-supabase': major
+'stash': major
+---
+
+CipherStash Stack 1.0 (release candidate).
+
+This is the first 1.0-line release of `@cipherstash/stack`, the first published
+release of the split-out EQL v3 adapters `@cipherstash/stack-drizzle` and
+`@cipherstash/stack-supabase`, and moves the `stash` CLI to 1.0 alongside them.
+These four packages now version together as the Stack 1.0 family.