diff --git a/proc_macros/Cargo.toml b/proc_macros/Cargo.toml
index 5d2b6ec..0abb673 100644
--- a/proc_macros/Cargo.toml
+++ b/proc_macros/Cargo.toml
@@ -11,7 +11,7 @@ path = "proc_macros.rs"
 proc-macro = true
 
 [dependencies]
-convert_case = "0.5"
+convert_case = "0.6"
 json = "0"
 parse_duration = "2"
 proc-macro2 = "1"