diff --git a/Project.toml b/Project.toml
index f533d13a..028fc4a4 100644
--- a/Project.toml
+++ b/Project.toml
@@ -20,7 +20,6 @@ Makie = "ee78f7c6-11fb-53f2-987a-cfe4a2b5a57a"
 Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
 
 [extensions]
-FHistCairoMakieExt = "CairoMakie"
 FHistHDF5Ext = "HDF5"
 FHistMakieExt = "Makie"
 FHistPlotsExt = "Plots"