diff --git a/wkt-types/Cargo.toml b/wkt-types/Cargo.toml
index 4a7b760..91991a2 100644
--- a/wkt-types/Cargo.toml
+++ b/wkt-types/Cargo.toml
@@ -35,5 +35,5 @@ prost-types = "0.13.1"
 prost-build = "0.13.1"
 prost-wkt-build = { version = "0.6.0", path = "../wkt-build" }
 regex = "1"
-protobuf-src = { version = "1.1.0", optional = true }
+protobuf-src = { version = "2.1.0", optional = true }
 protox = { version = "0.6.0", optional = true }