diff --git a/Project.toml b/Project.toml
index 276816b6a..0c7756b72 100644
--- a/Project.toml
+++ b/Project.toml
@@ -17,7 +17,7 @@ ZygoteRules = "700de1a5-db45-46bc-99cf-38207098b444"
 Compat = "2.2, 3"
 Distances = "0.8"
 Requires = "1.0.1"
-SpecialFunctions = "0.8, 0.9, 0.10"
+SpecialFunctions = "0.8, 0.9, 0.10, 1.5"
 StatsBase = "0.32"
 StatsFuns = "0.8, 0.9"
 ZygoteRules = "0.2"