diff --git a/Project.toml b/Project.toml
index 0a55c51..297addf 100644
--- a/Project.toml
+++ b/Project.toml
@@ -27,7 +27,7 @@ TestSetExtensions = "3"
 Geodesy = "1"
 YAML = "0.4"
 DataFrames = "1"
-SpecialFunctions = "2"
+SpecialFunctions = "0","2"
 FiniteDiff = "2"
 XLSX = "0.10"
 DelimitedFiles = "1"