--- err-derive-0.2.1/Cargo.toml	1970-01-01T00:00:00+00:00
+++ err-derive-0.2.1/Cargo.toml	2019-12-06T21:22:49.380718+00:00
@@ -25,7 +25,7 @@
 [lib]
 proc-macro = true
 [dependencies.proc-macro-error]
-version = "0.2.6"
+version = "0.4"
 
 [dependencies.proc-macro2]
 version = "1.0.1"