diff --git a/Project.toml b/Project.toml
index af0cda32..01889500 100644
--- a/Project.toml
+++ b/Project.toml
@@ -40,7 +40,7 @@ IterativeSolvers = "0.8, 0.9"
 Missings = "0.4, 1.0"
 Mustache = "1"
 NCDatasets = "0.10, 0.11"
-SpecialFunctions = "0.8, 0.10, 1.0"
+SpecialFunctions = "0.8, 0.10, 1.0, 2"
 ZipFile = "0.8, 0.9"
 julia = "0.7, 1"