diff --git a/Cargo.lock b/Cargo.lock
index 9b3bc30b..8d485098 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2598,9 +2598,9 @@ dependencies = [
 
 [[package]]
 name = "protobuf"
-version = "3.3.0"
+version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b65f4a8ec18723a734e5dc09c173e0abf9690432da5340285d536edcb4dac190"
+checksum = "58678a64de2fced2bdec6bca052a6716a0efe692d6e3f53d1bda6a1def64cfc0"
 dependencies = [
  "once_cell",
  "protobuf-support",
@@ -2609,9 +2609,9 @@ dependencies = [
 
 [[package]]
 name = "protobuf-support"
-version = "3.3.0"
+version = "3.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6872f4d4f4b98303239a2b5838f5bbbb77b01ffc892d627957f37a22d7cfe69c"
+checksum = "e1ed294a835b0f30810e13616b1cd34943c6d1e84a8f3b0dcfe466d256c3e7e7"
 dependencies = [
  "thiserror",
 ]
diff --git a/wtx/Cargo.toml b/wtx/Cargo.toml
index cd830b1a..e2318917 100644
--- a/wtx/Cargo.toml
+++ b/wtx/Cargo.toml
@@ -76,7 +76,7 @@ md-5 = { default-features = false, optional = true, version = "0.10" }
 memchr = { default-features = false, optional = true, version = "2.0" }
 miniserde = { default-features = false, optional = true, version = "0.1" }
 proptest = { default-features = false, features = ["alloc"], optional = true, version = "1.0" }
-protobuf = { default-features = false, optional = true, version = "3.0" }
+protobuf = { default-features = false, optional = true, version = "3.4" }
 rand = { default-features = false, features = ["small_rng"], optional = true, version = "0.8" }
 reqwest = { default-features = false, optional = true, version = "0.11" }
 ring = { default-features = false, optional = true, version = "0.17" }