--- a/Cargo.toml
+++ b/Cargo.toml
@@ -9,9 +9,9 @@ edition = "2018"
 anyhow = "1.0"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1.0"
-gimli = "0.27"
-fallible-iterator = "0.2"
+gimli = ">= 0.27"
+fallible-iterator = "0"
 memmap = "0.7"
-object = { version = "0.30", features = [ "std", "compression" ] }
+object = { version = ">= 0.30", features = [ "std", "compression" ] }
 typed-arena = "2"
-structopt = "0.3"
+structopt = ">= 0.3"