diff --git a/Cargo.lock b/Cargo.lock
index 3cd0023b573f9..f9e5363462923 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2740,7 +2740,7 @@ dependencies = [
  "libc",
  "option-ext",
  "redox_users",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.1",
 ]
 
 [[package]]
@@ -11668,7 +11668,7 @@ dependencies = [
  "getrandom 0.3.3",
  "once_cell",
  "rustix 1.0.7",
- "windows-sys 0.59.0",
+ "windows-sys 0.61.1",
 ]
 
 [[package]]
@@ -12227,14 +12227,12 @@ dependencies = [
 
 [[package]]
 name = "tonic-build"
-version = "0.12.3"
+version = "0.14.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9557ce109ea773b399c9b9e5dca39294110b74f1f342cb347a80d1fce8c26a11"
+checksum = "4c40aaccc9f9eccf2cd82ebc111adc13030d23e887244bc9cfa5d1d636049de3"
 dependencies = [
  "prettyplease",
  "proc-macro2",
- "prost-build",
- "prost-types",
  "quote",
  "syn 2.0.106",
 ]
diff --git a/src/fivetran-destination/Cargo.toml b/src/fivetran-destination/Cargo.toml
index 7c4ef549440a8..146903b79ccf9 100644
--- a/src/fivetran-destination/Cargo.toml
+++ b/src/fivetran-destination/Cargo.toml
@@ -46,7 +46,7 @@ insta = "1.43"
 mz-build-tools = { path = "../build-tools", default-features = false, features = ["protobuf-src"] }
 prost-build = "0.13.5"
 reqwest = { version = "0.11.13", features = ["blocking", "native-tls-vendored"] }
-tonic-build = "0.12.3"
+tonic-build = "0.14.2"
 
 [features]
 default = ["mz-build-tools/default", "workspace-hack"]
diff --git a/src/persist-client/Cargo.toml b/src/persist-client/Cargo.toml
index 6b2be65705588..eed6101e5ff7c 100644
--- a/src/persist-client/Cargo.toml
+++ b/src/persist-client/Cargo.toml
@@ -79,7 +79,7 @@ tempfile = "3.23.0"
 [build-dependencies]
 mz-build-tools = { path = "../build-tools", default-features = false, features = ["protobuf-src"] }
 prost-build = "0.13.5"
-tonic-build = "0.12.3"
+tonic-build = "0.14.2"
 
 [features]
 default = ["mz-build-tools/default", "workspace-hack"]
diff --git a/src/testdrive/Cargo.toml b/src/testdrive/Cargo.toml
index b2c8239370c55..5da0934e3ceb2 100644
--- a/src/testdrive/Cargo.toml
+++ b/src/testdrive/Cargo.toml
@@ -86,7 +86,7 @@ workspace-hack = { version = "0.0.0", path = "../workspace-hack", optional = tru
 [build-dependencies]
 mz-build-tools = { path = "../build-tools", default-features = false, features = ["protobuf-src"] }
 prost-build = "0.13.5"
-tonic-build = "0.12.3"
+tonic-build = "0.14.2"
 
 [features]
 default = ["mz-build-tools/default", "workspace-hack"]