diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 6003553..1606591 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -42,7 +42,7 @@ jobs:
 
   deploy:
     name: Deploy docs
-    if: ${{ github.ref == 'refs/heads/stable/0.8' }}
+    if: ${{ github.ref == 'refs/heads/stable/0.9' }}
     needs: build
     permissions:
       pages: write
diff --git a/.mergify.yml b/.mergify.yml
index 642ea7b..a8fe0e9 100644
--- a/.mergify.yml
+++ b/.mergify.yml
@@ -5,4 +5,4 @@ pull_request_rules:
     actions:
       backport:
         branches:
-          - stable/0.8
+          - stable/0.9
diff --git a/pyproject.toml b/pyproject.toml
index 4f49319..4a8ae39 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "qiskit-addon-sqd"
-version = "0.8.0"
+version = "0.9.0"
 readme = "README.md"
 description = "Classically postprocess noisy quantum samples to yield more accurate energy estimations"
 license = {file = "LICENSE.txt"}
diff --git a/qiskit_addon_sqd/fermion.py b/qiskit_addon_sqd/fermion.py
index adba3dd..8c0f07c 100644
--- a/qiskit_addon_sqd/fermion.py
+++ b/qiskit_addon_sqd/fermion.py
@@ -344,7 +344,7 @@ def flip_orbital_occupancies(occupancies: np.ndarray) -> np.ndarray:
 
 
 @deprecate_func(
-    removal_timeline="no sooner than qiskit-addon-sqd 0.9.0",
+    removal_timeline="no sooner than qiskit-addon-sqd 0.10.0",
     since="0.6.0",
     package_name="qiskit-addon-sqd",
     additional_msg="Use the bitstring_matrix_to_ci_strs function.",
diff --git a/releasenotes/notes/fix-indexing-0c49df940710efde.yaml b/releasenotes/notes/0.9/fix-indexing-0c49df940710efde.yaml
similarity index 100%
rename from releasenotes/notes/fix-indexing-0c49df940710efde.yaml
rename to releasenotes/notes/0.9/fix-indexing-0c49df940710efde.yaml
diff --git a/releasenotes/notes/improve-oo-fcfad41b146ecea0.yaml b/releasenotes/notes/0.9/improve-oo-fcfad41b146ecea0.yaml
similarity index 100%
rename from releasenotes/notes/improve-oo-fcfad41b146ecea0.yaml
rename to releasenotes/notes/0.9/improve-oo-fcfad41b146ecea0.yaml
diff --git a/releasenotes/notes/pyscf-win32-6e4a47d11576aa47.yaml b/releasenotes/notes/0.9/pyscf-win32-6e4a47d11576aa47.yaml
similarity index 100%
rename from releasenotes/notes/pyscf-win32-6e4a47d11576aa47.yaml
rename to releasenotes/notes/0.9/pyscf-win32-6e4a47d11576aa47.yaml