diff --git a/Cargo.lock b/Cargo.lock
index 248dc3b..f402255 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1847,7 +1847,6 @@ version = "0.2.0"
 dependencies = [
  "arboard",
  "env_logger",
- "fontdb",
  "ksni",
  "log",
  "notify-rust",
diff --git a/Cargo.toml b/Cargo.toml
index c1ed34a..4c2dfb8 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -10,7 +10,6 @@ authors = [
 [dependencies]
 arboard = {version = "3.3.2", features = ["wl-clipboard-rs", "wayland-data-control"]}
 env_logger = "0.11"
-fontdb = "0.16"
 ksni = {git="https://github.com/iovxw/ksni", branch="zbus" }
 log = "0.4"
 notify-rust = {version = "4.10", default_features = false, features = ["d"]}
diff --git a/nix/package.nix b/nix/package.nix
index 5a07b4a..80cf180 100644
--- a/nix/package.nix
+++ b/nix/package.nix
@@ -25,15 +25,17 @@ in
         ]);
     };
 
-    cargoLock.lockFile = ../Cargo.lock;
+    cargoLock = {
+      lockFile = ../Cargo.lock;
+      outputHashes = {
+        "ksni-0.2.1" = "sha256-CKjOUGsqlMdgnNY6j29pP6S8wdZ73/v1dMyiIurlltI=";
+      };
+    };
 
     strictDeps = true;
 
+    nativeBuildInputs = [pkg-config python3];
     buildInputs = [dbus xorg.libxcb];
-    nativeBuildInputs = [
-      pkg-config
-      python3
-    ];
 
     meta = {
       description = "Rust implementation of tailscale-systray";
diff --git a/src/svg/renderer.rs b/src/svg/renderer.rs
index c4e7347..6250133 100644
--- a/src/svg/renderer.rs
+++ b/src/svg/renderer.rs
@@ -2,7 +2,7 @@ use ksni::Icon;
 use resvg::{
     self,
     tiny_skia::{Pixmap, Transform},
-    usvg::{Options, Tree},
+    usvg::{fontdb, Options, Tree},
 };
 
 const SVG_DATA: &str = include_str!("assets/tailscale.svg");