diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 2686af4..8b68fa1 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/0.3' }}
+    if: ${{ github.ref == 'refs/heads/stable/0.4' }}
     needs: build
     permissions:
       pages: write
diff --git a/.mergify.yml b/.mergify.yml
index 899cc69..0c4f2e6 100644
--- a/.mergify.yml
+++ b/.mergify.yml
@@ -5,4 +5,4 @@ pull_request_rules:
     actions:
       backport:
         branches:
-          - stable/0.3
+          - stable/0.4
diff --git a/pyproject.toml b/pyproject.toml
index 85b3883..bbd9c7f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "qiskit-addon-sqd"
-version = "0.3.0"
+version = "0.4.0"
 readme = "README.md"
 description = "Classically postprocess noisy quantum samples to yield more accurate energy estimations"
 license = {file = "LICENSE.txt"}
diff --git a/releasenotes/notes/subsample-hamming-76674dbaf6f411c2.yaml b/releasenotes/notes/0.4/subsample-hamming-76674dbaf6f411c2.yaml
similarity index 96%
rename from releasenotes/notes/subsample-hamming-76674dbaf6f411c2.yaml
rename to releasenotes/notes/0.4/subsample-hamming-76674dbaf6f411c2.yaml
index c0baa63..6da9df6 100644
--- a/releasenotes/notes/subsample-hamming-76674dbaf6f411c2.yaml
+++ b/releasenotes/notes/0.4/subsample-hamming-76674dbaf6f411c2.yaml
@@ -1,6 +1,6 @@
 ---
 prelude: >
-    This is a patch release which introduces a couple of small, but important, breaking changes to to the API. These changes allow for a more consistent pattern in specifying the number of alpha and beta electrons throughout both the chemistry and non-chemistry functions in the API.
+    This is a minor release which introduces a couple of small, but important, breaking changes to to the API. These changes allow for a more consistent pattern in specifying the number of alpha and beta electrons throughout both the chemistry and non-chemistry functions in the API.
 
 upgrade:
   - |