diff --git a/Cargo.toml b/Cargo.toml
index d8a7259..355c69b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -4,6 +4,8 @@ version = "0.9.0"
 edition = "2024"
 description = "Offensive-first HTTP library with Python bindings"
 license = "GPL-3.0"
+# CI-only pin. Shipping it would override the toolchain of anyone building from the sdist.
+exclude = ["rust-toolchain.toml"]
 
 [lib]
 # When building as a Python module, we need a cdylib (shared library).
diff --git a/rust-toolchain.toml b/rust-toolchain.toml
new file mode 100644
index 0000000..1199015
--- /dev/null
+++ b/rust-toolchain.toml
@@ -0,0 +1,4 @@
+# Pinned so new clippy lints don't break dependabot PRs. Bump deliberately, fixing new lints in the same commit.
+[toolchain]
+channel = "1.97.1"
+components = ["clippy", "rustfmt"]
diff --git a/src/mock.rs b/src/mock.rs
index d7a63de..133d263 100644
--- a/src/mock.rs
+++ b/src/mock.rs
@@ -838,7 +838,7 @@ impl PyBlasthttpMock {
                     Some(body_obj)
                 };
                 let files_obj = bound.getattr("files").ok();
-                let files = files_obj.and_then(|f| if f.is_none() { None } else { Some(f) });
+                let files = files_obj.filter(|f| !f.is_none());
                 let (body_bytes, final_headers) =
                     crate::python::apply_body_and_files(body, files, headers)?;
                 mock_entries.push(MockBatchEntry {