diff --git a/.changeset/unlucky-rings-exist.md b/.changeset/unlucky-rings-exist.md
new file mode 100644
index 00000000000..5d847f73246
--- /dev/null
+++ b/.changeset/unlucky-rings-exist.md
@@ -0,0 +1,5 @@
+---
+"dmg-builder": patch
+---
+
+fix: update the `dmgbuild` hex regex for `backgroundColor` to be case insensitive
diff --git a/packages/dmg-builder/vendor/dmgbuild/colors.py b/packages/dmg-builder/vendor/dmgbuild/colors.py
index 8cab342a789..eafe7c9bfaa 100644
--- a/packages/dmg-builder/vendor/dmgbuild/colors.py
+++ b/packages/dmg-builder/vendor/dmgbuild/colors.py
@@ -257,7 +257,7 @@ def to_rgb(self):
 
 _ws_re = re.compile(r"\s+")
 _token_re = re.compile(r"[A-Za-z_][A-Za-z0-9_]*")
-_hex_re = re.compile(r"#([0-9a-f]{3}(?:[0-9a-f]{3})?)$")
+_hex_re = re.compile(r"#([0-9a-f]{3}(?:[0-9a-f]{3})?)$", re.IGNORECASE)
 _number_re = re.compile(r"[0-9]*(\.[0-9]*)")
 
 
diff --git a/packages/dmg-builder/vendor/dmgbuild/core.py b/packages/dmg-builder/vendor/dmgbuild/core.py
index 47dfd9dfd02..6f48daaddcc 100644
--- a/packages/dmg-builder/vendor/dmgbuild/core.py
+++ b/packages/dmg-builder/vendor/dmgbuild/core.py
@@ -25,7 +25,7 @@
     badge = None
 
 
-_hexcolor_re = re.compile(r"#[0-9a-f]{3}(?:[0-9a-f]{3})?")
+_hexcolor_re = re.compile(r"#[0-9a-f]{3}(?:[0-9a-f]{3})?", re.IGNORECASE)
 
 # The first element in the platform.mac_ver() tuple is a string containing the
 # macOS version (e.g., '10.15.6'). Parse into an integer tuple.