diff --git a/Project.toml b/Project.toml
index 090e4e134e723442cec57e77d727996480b462b8..ef60e37c7cf1f3d3ba1b7c7e95d84dd3c4bf7891 100644
--- a/Project.toml
+++ b/Project.toml
@@ -40,7 +40,7 @@ DocStringExtensions = "^0.8, ^0.9"
 HDF5 = "^0.16, ^0.17"
 HTTP = "^1"
 KM3NeTTestData = "^0.4.7"
-KM3io = "^0.15.0 ^0.16.2"
+KM3io = "^0.15.0, ^0.16.2"
 LandauDistribution = "^0.2"
 ProgressMeter = "^1"
 RecipesBase = "^0.7, ^0.8, ^1"