diff --git a/Project.toml b/Project.toml
index 0d9d268277..21c547dc12 100644
--- a/Project.toml
+++ b/Project.toml
@@ -18,7 +18,7 @@ Unicode = "4ec0a83e-493e-50e2-b9ac-8f72acf5a8f5"
 [compat]
 BenchmarkTools = "0.4, 0.5"
 CodecBzip2 = "~0.6"
-CodecZlib = "~0.6"
+CodecZlib = "~0.6, 0.7"
 JSON = "~0.21"
 JSONSchema = "0.2"
 MutableArithmetics = "0.2"