diff --git a/Project.toml b/Project.toml
index 6da043f..2bd91f2 100644
--- a/Project.toml
+++ b/Project.toml
@@ -16,10 +16,10 @@ UnicodePlots = "b8865327-cd53-5732-bb35-84acbb429228"
 [compat]
 FFTW = "1"
 GDAL = "1"
+GMT = "0.41, 0.42"
 SeisIO = "1"
 UnicodePlots = "2"
 julia = "1"
-GMT = "0.41"
 
 [extras]
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"