diff --git a/Project.toml b/Project.toml
index a60a54f..3d6cc35 100644
--- a/Project.toml
+++ b/Project.toml
@@ -30,6 +30,7 @@ PhysicalConstants = "0.2"
 Plots = "1.10"
 ProgressLogging = "0.1"
 PyPlot = "2.9"
+Rotations = "1.0"
 RecursiveArrayTools = "2.11"
 SDFResults = "0.1"
 StaticArrays = "1.1"