diff --git a/calendar-service/Cargo.toml b/calendar-service/Cargo.toml
index a9036da..98cf1e7 100644
--- a/calendar-service/Cargo.toml
+++ b/calendar-service/Cargo.toml
@@ -8,7 +8,7 @@ edition = "2021"
 [dependencies]
 tonic = "0.9.1"
 prost = "0.11.9"
-prost-types = "0.11.9"
+prost-types = "0.12.3"
 tokio = { version = "1.27.0", features = ["macros", "rt-multi-thread"] }
 ics = "0.5.8"
 chrono = "0.4.24"