diff --git a/charts/matrix-stack/Chart.yaml b/charts/matrix-stack/Chart.yaml
index 10ab737e8..35e3ceed6 100644
--- a/charts/matrix-stack/Chart.yaml
+++ b/charts/matrix-stack/Chart.yaml
@@ -9,6 +9,7 @@ version: 25.10.4-dev
 kubeVersion: '>= 1.22.0'
 description: A Helm chart for deploying a Matrix Stack from Element
 type: application
+icon: data:image/png;base64,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
 keywords:
   - ESS
   - Element
diff --git a/newsfragments/848.changed.md b/newsfragments/848.changed.md
new file mode 100644
index 000000000..0dd458d6d
--- /dev/null
+++ b/newsfragments/848.changed.md
@@ -0,0 +1 @@
+Re-add the chart's icon.
diff --git a/newsfragments/848.internal.md b/newsfragments/848.internal.md
new file mode 100644
index 000000000..882353e8b
--- /dev/null
+++ b/newsfragments/848.internal.md
@@ -0,0 +1 @@
+CI: Use Element customised `pyhelm3` dependency for running tests.
diff --git a/poetry.lock b/poetry.lock
index 65efae660..478daa0be 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -2651,18 +2651,22 @@ windows-terminal = ["colorama (>=0.4.6)"]
 [[package]]
 name = "pyhelm3"
 version = "0.4.0"
-description = "Python library for managing Helm releases using Helm 3."
+description = "Python library for managing Helm releases using Helm 3 (i.e. Tiller-less Helm)."
 optional = false
-python-versions = "*"
+python-versions = ">=3.9"
 groups = ["dev"]
-files = [
-    {file = "pyhelm3-0.4.0-py3-none-any.whl", hash = "sha256:6f608891fbe8db9b8015b839f29524dccd6eade0da879820690d71de9c3f2f8d"},
-    {file = "pyhelm3-0.4.0.tar.gz", hash = "sha256:7ce688cab8e12df5240641774c36acfd3cad6d9a6325781bc7b5a354e522c594"},
-]
+files = []
+develop = false
 
 [package.dependencies]
-pydantic = "*"
-pyyaml = "*"
+pydantic = "^2.10.6"
+pyyaml = "^6.0.2"
+
+[package.source]
+type = "git"
+url = "https://github.com/element-hq/pyhelm3.git"
+reference = "788ac4c1f"
+resolved_reference = "788ac4c1ff5c72bdb7763c59256aabd0c795feb3"
 
 [[package]]
 name = "pynacl"
@@ -4071,4 +4075,4 @@ type = ["pytest-mypy"]
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.12,<4.0"
-content-hash = "70f34cf22117be2e09e80a5a77829b838565c9414d99bb19162a642885375b64"
+content-hash = "7eadbb7927650b515feed53f6f8923d8a03aa7ac111d979840e9de9523201d01"
diff --git a/pyproject.toml b/pyproject.toml
index 488a4e79d..837f3d84c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,8 @@ package-mode = false
 python = ">=3.12,<4.0"
 
 [tool.poetry.group.dev.dependencies]
-pyhelm3 = "^0.4.0"
+# For https://github.com/azimuth-cloud/pyhelm3/pull/36 & https://github.com/azimuth-cloud/pyhelm3/pull/37
+pyhelm3 = {git = "https://github.com/element-hq/pyhelm3.git", rev = "788ac4c1f"}
 lightkube = "^0.17.2"
 pytz = "^2025.2"
 cryptography = "^46.0.3"