diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
index f8f844b..a752624 100644
--- a/.github/workflows/docker.yml
+++ b/.github/workflows/docker.yml
@@ -87,6 +87,13 @@ jobs:
   image:
     needs: test
     runs-on: ubuntu-latest
+    # A push to a PR branch starts a push run and a pull_request run for the
+    # same commit. Two builds writing the gha cache at once can stall buildx
+    # for many minutes, so the second waits for the first and then finds the
+    # cache fresh. Not cancelled: each run's image check has to finish.
+    concurrency:
+      group: image-${{ github.event.pull_request.head.sha || github.sha }}
+      cancel-in-progress: false
     outputs:
       pushed: ${{ steps.pushed.outputs.pushed }}
     env:
diff --git a/docs/releases/0.6.2.md b/docs/releases/0.6.2.md
new file mode 100644
index 0000000..b71e383
--- /dev/null
+++ b/docs/releases/0.6.2.md
@@ -0,0 +1,15 @@
+Nothing changes in Dapple itself. This release fixes how it gets built.
+
+## What's changed
+
+- **Builds no longer stall now and then.** Two copies of the image build could start at once for the same change and get in each other's way, which sometimes held up a release for many minutes. Now the second one waits its turn.
+
+## Upgrading
+
+Running Dapple as a Home Assistant app: install the update from Settings → Updates.
+
+With Docker, `docker compose up -d` picks this up if you have `pull_policy: always`. Otherwise run `docker compose pull && docker compose up -d`. Your settings and saved presets carry over. To stay on this release, set the image line to:
+
+```yaml
+    image: afraley/dapple:0.6.2
+```
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 2cfeb54..675b4d4 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "dapple-ui",
-  "version": "0.6.1",
+  "version": "0.6.2",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "dapple-ui",
-      "version": "0.6.1",
+      "version": "0.6.2",
       "license": "MIT",
       "dependencies": {
         "@emotion/react": "^11.13.3",
diff --git a/frontend/package.json b/frontend/package.json
index 6182296..e8d02c5 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -2,7 +2,7 @@
   "name": "dapple-ui",
   "private": true,
   "license": "MIT",
-  "version": "0.6.1",
+  "version": "0.6.2",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/home-assistant/dapple/config.yaml b/home-assistant/dapple/config.yaml
index 8cf3bc5..7039e37 100644
--- a/home-assistant/dapple/config.yaml
+++ b/home-assistant/dapple/config.yaml
@@ -1,7 +1,7 @@
 # The Dapple add-on. The Supervisor pulls afraley/dapple:<version>, the same
 # image Docker users run, so `version` must match pyproject.toml (CI checks).
 name: Dapple
-version: "0.6.1"
+version: "0.6.2"
 slug: dapple
 description: Static multi-color patterns for Twinkly lights
 url: https://github.com/andrewfraley/dapple
diff --git a/pyproject.toml b/pyproject.toml
index c999b2f..826dd6e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "dapple"
-version = "0.6.1"
+version = "0.6.2"
 description = "Static multi-color patterns for Twinkly light strands, with a REST API for Home Assistant"
 requires-python = ">=3.12"
 dependencies = [
diff --git a/uv.lock b/uv.lock
index ea51c97..8b1ed71 100644
--- a/uv.lock
+++ b/uv.lock
@@ -393,7 +393,7 @@ wheels = [
 
 [[package]]
 name = "dapple"
-version = "0.6.1"
+version = "0.6.2"
 source = { editable = "." }
 dependencies = [
     { name = "aiomqtt" },