diff --git a/go.mod b/go.mod
index 0690322..72ddc52 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module github.com/dentech-floss/datetime
 go 1.26
 
 require (
-	github.com/relvacode/iso8601 v1.7.0
+	github.com/relvacode/iso8601 v1.8.0
 	github.com/stretchr/testify v1.11.1
 	google.golang.org/protobuf v1.36.11
 )
diff --git a/go.sum b/go.sum
index aa4e07a..bd89550 100644
--- a/go.sum
+++ b/go.sum
@@ -4,8 +4,8 @@ github.com/google/go-cmp v0.7.0 h1:wk8382ETsv4JYUZwIsn6YpYiWiBsYLSJiTsyBybVuN8=
 github.com/google/go-cmp v0.7.0/go.mod h1:pXiqmnSA92OHEEa9HXL2W4E7lf9JzCmGVUdgjX3N/iU=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/relvacode/iso8601 v1.7.0 h1:BXy+V60stMP6cpswc+a93Mq3e65PfXCgDFfhvNNGrdo=
-github.com/relvacode/iso8601 v1.7.0/go.mod h1:FlNp+jz+TXpyRqgmM7tnzHHzBnz776kmAH2h3sZCn0I=
+github.com/relvacode/iso8601 v1.8.0 h1:lDGJ4+nIXPzY1KOTk6DNfKZQWRGMmbvQKPNuZ7GxZPk=
+github.com/relvacode/iso8601 v1.8.0/go.mod h1:FlNp+jz+TXpyRqgmM7tnzHHzBnz776kmAH2h3sZCn0I=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
 google.golang.org/genproto v0.0.0-20260217215200-42d3e9bedb6d h1:vsOm753cOAMkt76efriTCDKjpCbK18XGHMJHo0JUKhc=