Index: zlib-rs/Cargo.toml
===================================================================
--- zlib-rs.orig/Cargo.toml
+++ zlib-rs/Cargo.toml
@@ -59,7 +59,7 @@ default-features = false
 version = "1.3.2"
 
 [dev-dependencies.memoffset]
-version = "0.9.1"
+version = ">= 0.8, < 0.10"
 
 [dev-dependencies.quickcheck]
 version = "1.0.3"