diff --git a/Cargo.toml b/Cargo.toml
index c66ba1fc..0b029bca 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -57,7 +57,7 @@ reqwest = { version = "0.11", features = ["json", "native-tls-vendored"] }
 rstest = "0.18.2"
 serde_json = "1"
 serial_test = "0.5.0"
-tempfile = "3.6"
+tempfile = "=3.14.0"
 tokio = { version = "1", features = ["sync", "rt-multi-thread", "macros"] }
 
 [[test]]
diff --git a/proto-build/Cargo.toml b/proto-build/Cargo.toml
index 36e0302c..ca3fad6e 100644
--- a/proto-build/Cargo.toml
+++ b/proto-build/Cargo.toml
@@ -13,3 +13,5 @@ edition = "2021"
 [dependencies]
 glob = "0.3"
 tonic-build = { version = "0.10", features = ["cleanup-markdown"] }
+# Keep this compatible with rust-toolchain 1.84.1.
+tempfile = "=3.14.0"