diff --git a/json_rpc.nimble b/json_rpc.nimble
index e9558a9..a96d257 100644
--- a/json_rpc.nimble
+++ b/json_rpc.nimble
@@ -21,7 +21,7 @@ requires "nim >= 1.6.0",
          "stew",
          "nimcrypto",
          "stint",
-         "chronos >= 0.4.0 & < 0.5.0",
+         "chronos >= 4.0.0 & < 4.1.0",
          "httputils#head",
          "chronicles",
          "websock >= 0.1.0 & < 0.2.0",