diff --git a/Project.toml b/Project.toml
index e73ca37..c7eccb6 100644
--- a/Project.toml
+++ b/Project.toml
@@ -15,7 +15,7 @@ Reexport = "189a3867-3050-52da-a836-e630ba90ab69"
 CSV = "0.5, 0.6, 0.7, 0.8"
 CodecZlib = "0.4, 0.5, 0.6, 0.7"
 DataFrames = "0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22"
-FileIO = "1"
+FileIO = "~1.0, ~1.1, ~1.2, ~1.3, ~1.4, ~1.5"
 RData = "0.5, 0.6, 0.7"
 Reexport = "0.2, 1.0"
 julia = "1"