diff --git a/Cargo.lock b/Cargo.lock
index 4c3f8a8..1a8c38f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -6,6 +6,7 @@ version = "0.1.0"
 dependencies = [
  "chrono 0.4.6 (registry+https://github.com/rust-lang/crates.io-index)",
  "geo 0.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "rstar 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "structopt 0.2.15 (registry+https://github.com/rust-lang/crates.io-index)",
  "svg 0.5.12 (registry+https://github.com/rust-lang/crates.io-index)",
  "svgdom 0.16.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index d6afb64..e9ecf99 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,3 +15,4 @@ svg = "0.5.11"
 chrono = "0.4.6"
 structopt = { version = "0.2", default-features = false }
 svgdom = "0.16.1"
+rstar = "0.2.0"