diff --git a/Project.toml b/Project.toml
index 5923e42..cda58c8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -27,5 +27,5 @@ Plots = "1"
 ProgressMeter = "1"
 Reexport = "0.2, 1.0"
 SpecialFunctions = "0.10, 1, 2"
-StatGeochemBase = "0.5.9"
+StatGeochemBase = "0.5.9, 0.6"
 julia = "1"