diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5a0e3f15c..c424c145d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -2,9 +2,9 @@ name: Tests
 
 on:
   push:
-    branches: [main, node-graph]
+    branches: [main]
   pull_request:
-    branches: [main, node-graph]
+    branches: [main]
 
 jobs:
   changes:
@@ -166,9 +166,9 @@ jobs:
       - name: Verify the graph acceptance burndown is monotone
         # The charter's second process rule, executable: the number of red
         # properties in the microcosm-graph acceptance suite never rises
-        # against origin/node-graph. The tool fetches that ref itself when the
-        # CI checkout does not carry it, and warns rather than failing when the
-        # branch is gone, so this cannot break main after the shard merges.
+        # against origin/main. The tool fetches that ref itself when the CI
+        # checkout does not carry it, and warns rather than failing when the
+        # baseline is unavailable.
         run: uv run python tools/graph_acceptance_burndown.py --verify
       - name: Sync workspace
         run: uv sync --all-packages --locked
diff --git a/changelog.d/graph-ratchet-baseline-main.changed.md b/changelog.d/graph-ratchet-baseline-main.changed.md
new file mode 100644
index 000000000..a0753de4f
--- /dev/null
+++ b/changelog.d/graph-ratchet-baseline-main.changed.md
@@ -0,0 +1 @@
+The graph acceptance burndown ratchet and the test workflow now baseline on `main`; the `node-graph` integration branch has merged.
diff --git a/docs/graph-acceptance.md b/docs/graph-acceptance.md
index ef1ea00fe..cab787c4e 100644
--- a/docs/graph-acceptance.md
+++ b/docs/graph-acceptance.md
@@ -15,7 +15,7 @@ Three process rules keep the suite honest:
    implementation PR fails CI, so a test can never be green by accident.
 2. **Monotone burndown.** `tools/graph_acceptance_burndown.py --verify`
    fails if the number of `xfail` markers in the suite is higher than on
-   `origin/node-graph`. Nobody re-reds a property.
+   `origin/main` (`origin/node-graph` until the shard merged). Nobody re-reds a property.
 3. **Implementer ≠ author.** The lane that writes a property's test is a
    different lane from the one that makes it pass, and implementation
    pull requests never edit the suite. Ownership is in the last section.
@@ -219,6 +219,6 @@ pull request reviewed by the Fable main.
 - **Max:** the rulings in the review's "Decisions that are yours" as they
   come due, and the `node-graph → main` merge.
 
-Branch: `node-graph`, off `origin/main` at `4c6cc58c`. Work lands as pull
+Branch: `node-graph`, off `origin/main` at `4c6cc58c`; merged into `main` on 2026-09-02 in #836 with every property green. Work lands as pull
 requests into `node-graph`; `node-graph` merges to `main` when the suite has
 zero `xfail` markers and H1–H2 are green.
diff --git a/packages/microcosm-graph/tests/test_graph_acceptance_burndown.py b/packages/microcosm-graph/tests/test_graph_acceptance_burndown.py
index 91fa3d9b6..dc1cc330d 100644
--- a/packages/microcosm-graph/tests/test_graph_acceptance_burndown.py
+++ b/packages/microcosm-graph/tests/test_graph_acceptance_burndown.py
@@ -180,7 +180,7 @@ def _repository(tmp_path: Path, sources: dict[str, str]) -> Path:
     )
     for name, text in sources.items():
         (root / "packages" / "microcosm-graph" / "tests" / name).write_text(text)
-    subprocess.run(["git", "init", "-q", "-b", "node-graph"], cwd=root, check=True)
+    subprocess.run(["git", "init", "-q", "-b", "main"], cwd=root, check=True)
     subprocess.run(["git", "add", "-A"], cwd=root, check=True)
     subprocess.run(
         [
@@ -197,7 +197,7 @@ def _repository(tmp_path: Path, sources: dict[str, str]) -> Path:
         check=True,
     )
     subprocess.run(
-        ["git", "update-ref", "refs/remotes/origin/node-graph", "HEAD"],
+        ["git", "update-ref", "refs/remotes/origin/main", "HEAD"],
         cwd=root,
         check=True,
     )
diff --git a/tools/graph_acceptance_burndown.py b/tools/graph_acceptance_burndown.py
index 141a932c2..923b8ffc4 100644
--- a/tools/graph_acceptance_burndown.py
+++ b/tools/graph_acceptance_burndown.py
@@ -12,7 +12,7 @@
 marker on a helper would all fool a text search, and the number this prints is
 the number the charter is scored on.
 
-``--verify`` compares against ``origin/node-graph``, file by file, and exits 1
+``--verify`` compares against ``origin/main``, file by file, and exits 1
 if any file's count rose. A file that does not exist on the baseline is
 reported as new and constrains nothing; a file that does is a ratchet. It also
 refuses a marker that is not ``strict=True`` (a non-strict marker hides an
@@ -40,8 +40,8 @@
 CHARTER = "docs/graph-acceptance.md"
 
 #: The branch the ratchet compares against, and how to fetch it if absent.
-BASELINE_REF = "origin/node-graph"
-BASELINE_REFSPEC = "+refs/heads/node-graph:refs/remotes/origin/node-graph"
+BASELINE_REF = "origin/main"
+BASELINE_REFSPEC = "+refs/heads/main:refs/remotes/origin/main"
 
 #: Charter ids this suite owns. Group V (the visuals) belongs to another lane
 #: and is not an ``xfail`` in this suite.