diff --git a/README.md b/README.md
index 12cd6eb..13e8ac0 100644
--- a/README.md
+++ b/README.md
@@ -72,6 +72,21 @@ root).
 - [`examples/complete`](examples/complete) — manage an entire organization.
 - [`examples/repository`](examples/repository) — use only the repository submodule.
 
+## Stability
+
+orgkit is **pre-1.0** and the input interface may still change between minor
+releases. Pin a version (`version = "~> 0.2"`) and review the changelog before
+upgrading. Breaking input changes so far, since the initial release:
+
+- **`unsafe_merges` removed** — use `allow_squash_merge` / `allow_rebase_merge`
+  (and the other granular merge controls) instead.
+- **`baseline_ruleset` and `require_signed_commits` removed** — use
+  `enabled_presets` (defaults reproduce the previous behavior) and
+  `organization_rulesets`; per-repo rules via `repositories[].rulesets`.
+- **Default merge strategy is now squash-only** (`allow_squash_merge = true`,
+  `allow_merge_commit = false`). Set the `allow_*` fields per repository to
+  change it.
+
 <!-- BEGIN_TF_DOCS -->
 ## Requirements
 
@@ -113,7 +128,7 @@ root).
 | <a name="input_organization_variables"></a> [organization\_variables](#input\_organization\_variables) | Org-level shared Actions variables (plaintext value + visibility). | <pre>map(object({<br/>    value        = string<br/>    visibility   = optional(string, "private")<br/>    repositories = optional(list(string), [])<br/>  }))</pre> | `{}` | no |
 | <a name="input_owners"></a> [owners](#input\_owners) | Explicit set of owner usernames (mapped to GitHub's `admin` role). Ignored when `owners_team` is set. | `set(string)` | `[]` | no |
 | <a name="input_owners_team"></a> [owners\_team](#input\_owners\_team) | Convenience: derive organization owners from the members of this team, by<br/>name. `null` (default) means use the explicit `owners` set instead. There is<br/>no hardcoded owners team — the consumer chooses. | `string` | `null` | no |
-| <a name="input_repositories"></a> [repositories](#input\_repositories) | Repositories and which teams may access them. See the repository submodule for the full object schema and validations. | <pre>list(object({<br/>    name        = string<br/>    description = string<br/>    visibility  = optional(string, "private")<br/>    readers     = optional(list(string), [])<br/>    writers     = optional(list(string), [])<br/>    admins      = optional(list(string), [])<br/>    restricted  = optional(bool, false)<br/><br/>    topics             = optional(list(string), [])<br/>    homepage_url       = optional(string, null)<br/>    has_issues         = optional(bool, true)<br/>    has_wiki           = optional(bool, false)<br/>    has_projects       = optional(bool, false)<br/>    has_downloads      = optional(bool, true)<br/>    is_template        = optional(bool, false)<br/>    gitignore_template = optional(string, null)<br/>    license_template   = optional(string, null)<br/>    archived           = optional(bool, false)<br/>    archive_on_destroy = optional(bool, false)<br/>    default_branch     = optional(string, null)<br/>    enable_pages       = optional(bool, false)<br/>    signed_commits     = optional(bool, true)<br/><br/>    allow_merge_commit     = optional(bool, true)<br/>    allow_squash_merge     = optional(bool, false)<br/>    allow_rebase_merge     = optional(bool, false)<br/>    allow_auto_merge       = optional(bool, true)<br/>    delete_branch_on_merge = optional(bool, true)<br/>    merge_commit_message   = optional(string, "PR_BODY")<br/>    merge_commit_title     = optional(string, "PR_TITLE")<br/><br/>    template = optional(object({<br/>      owner                = string<br/>      repository           = string<br/>      include_all_branches = optional(bool, false)<br/>    }))<br/><br/>    rulesets = optional(map(object({<br/>      enforcement  = optional(string, "active")<br/>      target       = optional(string, "branch")<br/>      include_refs = optional(list(string), ["~ALL"])<br/>      exclude_refs = optional(list(string), [])<br/>      bypass_actors = optional(list(object({<br/>        actor_type  = string<br/>        actor_id    = optional(number, 0)<br/>        team        = optional(string)<br/>        bypass_mode = optional(string, "always")<br/>      })), [])<br/>      rules = object({<br/>        creation                = optional(bool, false)<br/>        update                  = optional(bool, false)<br/>        deletion                = optional(bool, false)<br/>        non_fast_forward        = optional(bool, false)<br/>        required_signatures     = optional(bool, false)<br/>        required_linear_history = optional(bool, false)<br/>        pull_request = optional(object({<br/>          required_approving_review_count   = optional(number, 0)<br/>          require_code_owner_review         = optional(bool, false)<br/>          require_last_push_approval        = optional(bool, false)<br/>          dismiss_stale_reviews_on_push     = optional(bool, false)<br/>          required_review_thread_resolution = optional(bool, false)<br/>        }))<br/>      })<br/>    })), {})<br/><br/>    variables = optional(map(string), {})<br/>    environments = optional(map(object({<br/>      variables  = optional(map(string), {})<br/>      reviewers  = optional(list(string), [])<br/>      wait_timer = optional(number, 0)<br/>      deployment_branch_policy = optional(object({<br/>        protected_branches     = optional(bool, false)<br/>        custom_branch_policies = optional(list(string), [])<br/>      }))<br/>    })), {})<br/>  }))</pre> | `[]` | no |
+| <a name="input_repositories"></a> [repositories](#input\_repositories) | Repositories and which teams may access them. See the repository submodule for the full object schema and validations. | <pre>list(object({<br/>    name        = string<br/>    description = string<br/>    visibility  = optional(string, "private")<br/>    readers     = optional(list(string), [])<br/>    writers     = optional(list(string), [])<br/>    admins      = optional(list(string), [])<br/>    restricted  = optional(bool, false)<br/><br/>    topics             = optional(list(string), [])<br/>    homepage_url       = optional(string, null)<br/>    has_issues         = optional(bool, true)<br/>    has_wiki           = optional(bool, false)<br/>    has_projects       = optional(bool, false)<br/>    has_downloads      = optional(bool, true)<br/>    is_template        = optional(bool, false)<br/>    gitignore_template = optional(string, null)<br/>    license_template   = optional(string, null)<br/>    archived           = optional(bool, false)<br/>    archive_on_destroy = optional(bool, false)<br/>    default_branch     = optional(string, null)<br/>    enable_pages       = optional(bool, false)<br/>    signed_commits     = optional(bool, true)<br/><br/>    allow_merge_commit     = optional(bool, false)<br/>    allow_squash_merge     = optional(bool, true)<br/>    allow_rebase_merge     = optional(bool, false)<br/>    allow_auto_merge       = optional(bool, true)<br/>    delete_branch_on_merge = optional(bool, true)<br/>    merge_commit_message   = optional(string, "PR_BODY")<br/>    merge_commit_title     = optional(string, "PR_TITLE")<br/><br/>    template = optional(object({<br/>      owner                = string<br/>      repository           = string<br/>      include_all_branches = optional(bool, false)<br/>    }))<br/><br/>    rulesets = optional(map(object({<br/>      enforcement  = optional(string, "active")<br/>      target       = optional(string, "branch")<br/>      include_refs = optional(list(string), ["~ALL"])<br/>      exclude_refs = optional(list(string), [])<br/>      bypass_actors = optional(list(object({<br/>        actor_type  = string<br/>        actor_id    = optional(number, 0)<br/>        team        = optional(string)<br/>        bypass_mode = optional(string, "always")<br/>      })), [])<br/>      rules = object({<br/>        creation                = optional(bool, false)<br/>        update                  = optional(bool, false)<br/>        deletion                = optional(bool, false)<br/>        non_fast_forward        = optional(bool, false)<br/>        required_signatures     = optional(bool, false)<br/>        required_linear_history = optional(bool, false)<br/>        pull_request = optional(object({<br/>          required_approving_review_count   = optional(number, 0)<br/>          require_code_owner_review         = optional(bool, false)<br/>          require_last_push_approval        = optional(bool, false)<br/>          dismiss_stale_reviews_on_push     = optional(bool, false)<br/>          required_review_thread_resolution = optional(bool, false)<br/>        }))<br/>      })<br/>    })), {})<br/><br/>    variables = optional(map(string), {})<br/>    environments = optional(map(object({<br/>      variables  = optional(map(string), {})<br/>      reviewers  = optional(list(string), [])<br/>      wait_timer = optional(number, 0)<br/>      deployment_branch_policy = optional(object({<br/>        protected_branches     = optional(bool, false)<br/>        custom_branch_policies = optional(list(string), [])<br/>      }))<br/>    })), {})<br/>  }))</pre> | `[]` | no |
 | <a name="input_secrets"></a> [secrets](#input\_secrets) | Decrypted secret values keyed by scope. Supplied already-decrypted by the caller; this module never performs decryption. | <pre>object({<br/>    org = optional(map(string), {})<br/>    repos = optional(map(object({<br/>      actions      = optional(map(string), {})<br/>      environments = optional(map(map(string)), {})<br/>    })), {})<br/>  })</pre> | <pre>{<br/>  "org": {},<br/>  "repos": {}<br/>}</pre> | no |
 | <a name="input_teams"></a> [teams](#input\_teams) | Teams and their membership. A team may hold predefined organization-level<br/>GitHub roles via `org_roles`. Repository access is granted per repository via<br/>readers/writers/admins, not through org roles. | <pre>list(object({<br/>    name        = string<br/>    description = string<br/>    members     = optional(list(string), [])<br/>    org_roles   = optional(list(string), [])<br/>  }))</pre> | `[]` | no |
 | <a name="input_users"></a> [users](#input\_users) | Organization members. `fullname`/`email` are informational; membership is keyed on `username`. | <pre>list(object({<br/>    username = string<br/>    fullname = optional(string, "")<br/>    email    = optional(string, "")<br/>  }))</pre> | `[]` | no |
diff --git a/docs/DESIGN.md b/docs/DESIGN.md
index e2a3bbc..9aa3493 100644
--- a/docs/DESIGN.md
+++ b/docs/DESIGN.md
@@ -107,11 +107,9 @@ repository module (which would create a dependency cycle).
 manageable in the provider) and the deprecated `branch_protection_v3` resource
 (rulesets supersede it).
 
-## Planned default changes
+## Merge strategy default
 
-Defaults intended to change in a future major release. They preserve today's
-behavior for now, so existing configs see no plan churn until then:
-
-- **Merge strategy** — switch the default from merge commits to squash-only
-  (`allow_squash_merge = true`, `allow_merge_commit = false`). The module currently
-  defaults to merge commits.
+Repositories default to **squash-only** merges (`allow_squash_merge = true`,
+`allow_merge_commit = false`, `allow_rebase_merge = false`). Override per
+repository via the `allow_merge_commit` / `allow_squash_merge` /
+`allow_rebase_merge` fields (at least one must be enabled).
diff --git a/modules/repository/README.md b/modules/repository/README.md
index 237f9d6..99f6261 100644
--- a/modules/repository/README.md
+++ b/modules/repository/README.md
@@ -47,7 +47,7 @@ No modules.
 | Name | Description | Type | Default | Required |
 | ---- | ----------- | ---- | ------- | :------: |
 | <a name="input_all_members_team_id"></a> [all\_members\_team\_id](#input\_all\_members\_team\_id) | ID of the all-members team that receives default read access on non-restricted repositories. null disables the default read grant. | `string` | `null` | no |
-| <a name="input_repositories"></a> [repositories](#input\_repositories) | Repositories to manage and which teams may access them. `readers`, `writers`<br/>and `admins` reference team names from `var.teams`. A team listed at more than<br/>one level gets the highest permission (admin > write > read). Set<br/>`restricted = true` to withhold the default all-members read grant. | <pre>list(object({<br/>    name        = string<br/>    description = string<br/>    visibility  = optional(string, "private")<br/>    readers     = optional(list(string), [])<br/>    writers     = optional(list(string), [])<br/>    admins      = optional(list(string), [])<br/>    restricted  = optional(bool, false)<br/><br/>    topics             = optional(list(string), [])<br/>    homepage_url       = optional(string, null)<br/>    has_issues         = optional(bool, true)<br/>    has_wiki           = optional(bool, false)<br/>    has_projects       = optional(bool, false)<br/>    has_downloads      = optional(bool, true)<br/>    is_template        = optional(bool, false)<br/>    gitignore_template = optional(string, null)<br/>    license_template   = optional(string, null)<br/>    archived           = optional(bool, false)<br/>    archive_on_destroy = optional(bool, false)<br/>    default_branch     = optional(string, null)<br/>    enable_pages       = optional(bool, false)<br/>    signed_commits     = optional(bool, true)<br/><br/>    allow_merge_commit     = optional(bool, true)<br/>    allow_squash_merge     = optional(bool, false)<br/>    allow_rebase_merge     = optional(bool, false)<br/>    allow_auto_merge       = optional(bool, true)<br/>    delete_branch_on_merge = optional(bool, true)<br/>    merge_commit_message   = optional(string, "PR_BODY")<br/>    merge_commit_title     = optional(string, "PR_TITLE")<br/><br/>    template = optional(object({<br/>      owner                = string<br/>      repository           = string<br/>      include_all_branches = optional(bool, false)<br/>    }))<br/><br/>    rulesets = optional(map(object({<br/>      enforcement  = optional(string, "active")<br/>      target       = optional(string, "branch")<br/>      include_refs = optional(list(string), ["~ALL"])<br/>      exclude_refs = optional(list(string), [])<br/>      bypass_actors = optional(list(object({<br/>        actor_type  = string<br/>        actor_id    = optional(number, 0)<br/>        team        = optional(string)<br/>        bypass_mode = optional(string, "always")<br/>      })), [])<br/>      rules = object({<br/>        creation                = optional(bool, false)<br/>        update                  = optional(bool, false)<br/>        deletion                = optional(bool, false)<br/>        non_fast_forward        = optional(bool, false)<br/>        required_signatures     = optional(bool, false)<br/>        required_linear_history = optional(bool, false)<br/>        pull_request = optional(object({<br/>          required_approving_review_count   = optional(number, 0)<br/>          require_code_owner_review         = optional(bool, false)<br/>          require_last_push_approval        = optional(bool, false)<br/>          dismiss_stale_reviews_on_push     = optional(bool, false)<br/>          required_review_thread_resolution = optional(bool, false)<br/>        }))<br/>      })<br/>    })), {})<br/><br/>    variables = optional(map(string), {})<br/>    environments = optional(map(object({<br/>      variables  = optional(map(string), {})<br/>      reviewers  = optional(list(string), [])<br/>      wait_timer = optional(number, 0)<br/>      deployment_branch_policy = optional(object({<br/>        protected_branches     = optional(bool, false)<br/>        custom_branch_policies = optional(list(string), [])<br/>      }))<br/>    })), {})<br/>  }))</pre> | `[]` | no |
+| <a name="input_repositories"></a> [repositories](#input\_repositories) | Repositories to manage and which teams may access them. `readers`, `writers`<br/>and `admins` reference team names from `var.teams`. A team listed at more than<br/>one level gets the highest permission (admin > write > read). Set<br/>`restricted = true` to withhold the default all-members read grant. | <pre>list(object({<br/>    name        = string<br/>    description = string<br/>    visibility  = optional(string, "private")<br/>    readers     = optional(list(string), [])<br/>    writers     = optional(list(string), [])<br/>    admins      = optional(list(string), [])<br/>    restricted  = optional(bool, false)<br/><br/>    topics             = optional(list(string), [])<br/>    homepage_url       = optional(string, null)<br/>    has_issues         = optional(bool, true)<br/>    has_wiki           = optional(bool, false)<br/>    has_projects       = optional(bool, false)<br/>    has_downloads      = optional(bool, true)<br/>    is_template        = optional(bool, false)<br/>    gitignore_template = optional(string, null)<br/>    license_template   = optional(string, null)<br/>    archived           = optional(bool, false)<br/>    archive_on_destroy = optional(bool, false)<br/>    default_branch     = optional(string, null)<br/>    enable_pages       = optional(bool, false)<br/>    signed_commits     = optional(bool, true)<br/><br/>    allow_merge_commit     = optional(bool, false)<br/>    allow_squash_merge     = optional(bool, true)<br/>    allow_rebase_merge     = optional(bool, false)<br/>    allow_auto_merge       = optional(bool, true)<br/>    delete_branch_on_merge = optional(bool, true)<br/>    merge_commit_message   = optional(string, "PR_BODY")<br/>    merge_commit_title     = optional(string, "PR_TITLE")<br/><br/>    template = optional(object({<br/>      owner                = string<br/>      repository           = string<br/>      include_all_branches = optional(bool, false)<br/>    }))<br/><br/>    rulesets = optional(map(object({<br/>      enforcement  = optional(string, "active")<br/>      target       = optional(string, "branch")<br/>      include_refs = optional(list(string), ["~ALL"])<br/>      exclude_refs = optional(list(string), [])<br/>      bypass_actors = optional(list(object({<br/>        actor_type  = string<br/>        actor_id    = optional(number, 0)<br/>        team        = optional(string)<br/>        bypass_mode = optional(string, "always")<br/>      })), [])<br/>      rules = object({<br/>        creation                = optional(bool, false)<br/>        update                  = optional(bool, false)<br/>        deletion                = optional(bool, false)<br/>        non_fast_forward        = optional(bool, false)<br/>        required_signatures     = optional(bool, false)<br/>        required_linear_history = optional(bool, false)<br/>        pull_request = optional(object({<br/>          required_approving_review_count   = optional(number, 0)<br/>          require_code_owner_review         = optional(bool, false)<br/>          require_last_push_approval        = optional(bool, false)<br/>          dismiss_stale_reviews_on_push     = optional(bool, false)<br/>          required_review_thread_resolution = optional(bool, false)<br/>        }))<br/>      })<br/>    })), {})<br/><br/>    variables = optional(map(string), {})<br/>    environments = optional(map(object({<br/>      variables  = optional(map(string), {})<br/>      reviewers  = optional(list(string), [])<br/>      wait_timer = optional(number, 0)<br/>      deployment_branch_policy = optional(object({<br/>        protected_branches     = optional(bool, false)<br/>        custom_branch_policies = optional(list(string), [])<br/>      }))<br/>    })), {})<br/>  }))</pre> | `[]` | no |
 | <a name="input_repository_secrets"></a> [repository\_secrets](#input\_repository\_secrets) | Per-repository Actions and environment secret values (plaintext), keyed by<br/>repository name. Supplied already-decrypted by the caller; this module never<br/>performs decryption. | <pre>map(object({<br/>    actions      = optional(map(string), {})<br/>    environments = optional(map(map(string)), {})<br/>  }))</pre> | `{}` | no |
 | <a name="input_teams"></a> [teams](#input\_teams) | Map of team name => { id, slug } for teams that may be granted repository access or set as environment reviewers. Supplied by the teams module. | <pre>map(object({<br/>    id   = string<br/>    slug = string<br/>  }))</pre> | `{}` | no |
 
diff --git a/modules/repository/tests/repository.tftest.hcl b/modules/repository/tests/repository.tftest.hcl
index 60f7207..ec1db39 100644
--- a/modules/repository/tests/repository.tftest.hcl
+++ b/modules/repository/tests/repository.tftest.hcl
@@ -134,7 +134,7 @@ run "rejects_env_secret_for_undeclared_environment" {
   expect_failures = [github_actions_environment_secret.internal]
 }
 
-run "defaults_preserve_current_behavior" {
+run "default_merge_strategy_is_squash_only" {
   command = plan
 
   variables {
@@ -144,15 +144,14 @@ run "defaults_preserve_current_behavior" {
   assert {
     condition = alltrue([
       github_repository.internal["app"].has_issues,
-      github_repository.internal["app"].allow_merge_commit,
+      github_repository.internal["app"].allow_squash_merge,
       github_repository.internal["app"].allow_auto_merge,
       github_repository.internal["app"].delete_branch_on_merge,
       !github_repository.internal["app"].has_wiki,
-      !github_repository.internal["app"].allow_squash_merge,
+      !github_repository.internal["app"].allow_merge_commit,
       !github_repository.internal["app"].allow_rebase_merge,
-      github_repository.internal["app"].merge_commit_message == "PR_BODY",
     ])
-    error_message = "Repository defaults must reproduce the previous hardcoded behavior."
+    error_message = "Repositories must default to squash-only merges (squash on; merge-commit and rebase off)."
   }
 }
 
diff --git a/modules/repository/variables.tf b/modules/repository/variables.tf
index d54f304..7e4bba6 100644
--- a/modules/repository/variables.tf
+++ b/modules/repository/variables.tf
@@ -29,8 +29,8 @@ variable "repositories" {
     enable_pages       = optional(bool, false)
     signed_commits     = optional(bool, true)
 
-    allow_merge_commit     = optional(bool, true)
-    allow_squash_merge     = optional(bool, false)
+    allow_merge_commit     = optional(bool, false)
+    allow_squash_merge     = optional(bool, true)
     allow_rebase_merge     = optional(bool, false)
     allow_auto_merge       = optional(bool, true)
     delete_branch_on_merge = optional(bool, true)
diff --git a/release-please-config.json b/release-please-config.json
index cef6429..bc7637d 100644
--- a/release-please-config.json
+++ b/release-please-config.json
@@ -4,6 +4,8 @@
   "include-v-in-tag": true,
   "tag-separator": "/",
   "release-type": "terraform-module",
+  "bump-minor-pre-major": true,
+  "bump-patch-for-minor-pre-major": false,
   "packages": {
     ".": {}
   },
diff --git a/variables.tf b/variables.tf
index 1a00cf7..3897c7b 100644
--- a/variables.tf
+++ b/variables.tf
@@ -78,8 +78,8 @@ variable "repositories" {
     enable_pages       = optional(bool, false)
     signed_commits     = optional(bool, true)
 
-    allow_merge_commit     = optional(bool, true)
-    allow_squash_merge     = optional(bool, false)
+    allow_merge_commit     = optional(bool, false)
+    allow_squash_merge     = optional(bool, true)
     allow_rebase_merge     = optional(bool, false)
     allow_auto_merge       = optional(bool, true)
     delete_branch_on_merge = optional(bool, true)