diff --git a/pkgs/servers/home-assistant/custom-lovelace-modules/horizon-card/package.nix b/pkgs/servers/home-assistant/custom-lovelace-modules/horizon-card/package.nix
index 15555be3ee4b..7664dfc4f47a 100644
--- a/pkgs/servers/home-assistant/custom-lovelace-modules/horizon-card/package.nix
+++ b/pkgs/servers/home-assistant/custom-lovelace-modules/horizon-card/package.nix
@@ -16,14 +16,20 @@ stdenvNoCC.mkDerivation (finalAttrs: {
     hash = "sha256-z2cJ6BIhNnzUo9nIFxVyrPBVWSKf35fyLXK72pE8TJw=";
   };
 
+  patches = [
+    # Remove after upstream updates to Yarn 4.14
+    # https://github.com/rejuvenate/lovelace-horizon-card/blob/main/package.json#L4
+    ./yarn-4.14-support.patch
+  ];
+
   nativeBuildInputs = [
     yarn-berry
     yarn-berry.yarnBerryConfigHook
   ];
 
   offlineCache = yarn-berry.fetchYarnBerryDeps {
-    inherit (finalAttrs) src;
-    hash = "sha256-LYPHBnDRcGeXo2btx1A4/e7fr7MYg/2G5GkuG/xDG+I=";
+    inherit (finalAttrs) src patches;
+    hash = "sha256-KWbXvivHxoV4xQuY2m/wpajjIZcypeh6nuvRVnrtFM0=";
   };
 
   buildPhase = ''
diff --git a/pkgs/servers/home-assistant/custom-lovelace-modules/horizon-card/yarn-4.14-support.patch b/pkgs/servers/home-assistant/custom-lovelace-modules/horizon-card/yarn-4.14-support.patch
new file mode 100644
index 000000000000..75225db95b78
--- /dev/null
+++ b/pkgs/servers/home-assistant/custom-lovelace-modules/horizon-card/yarn-4.14-support.patch
@@ -0,0 +1,20 @@
+diff --git a/.yarnrc.yml b/.yarnrc.yml
+--- a/.yarnrc.yml
++++ b/.yarnrc.yml
+@@ -1,2 +1,5 @@
+ nodeLinker: node-modules
+ nmMode: hardlinks-local
++approvedGitRepositories:
++  - "**"
++enableScripts: true
+diff --git a/yarn.lock b/yarn.lock
+--- a/yarn.lock
++++ b/yarn.lock
+@@ -2,6 +2,6 @@
+ # Manual changes might be lost - proceed with caution!
+ 
+ __metadata:
+-  version: 8
++  version: 9
+   cacheKey: 10c0
+