diff --git a/scripts/generate-clients/build-smithy-typescript.js b/scripts/generate-clients/build-smithy-typescript.js
index 8795265b4b7d..d21fb62edcb1 100644
--- a/scripts/generate-clients/build-smithy-typescript.js
+++ b/scripts/generate-clients/build-smithy-typescript.js
@@ -10,10 +10,13 @@ const buildSmithyTypeScript = async (repo, commit) => {
     await access(repo);
   } catch (error) {
     deleteSmithyTsRepo = true;
-    await spawnProcess("git", ["clone", "https://github.com/awslabs/smithy-typescript.git", repo]);
+    await spawnProcess("git", ["clone", "https://github.com/awslabs/smithy-typescript.git", repo, "--depth=1"]);
   }
 
   // Checkout commit
+  await spawnProcess("git", ["fetch", "origin", commit, "--depth=1"], { cwd: repo });
+
+  // Switch to branch with commit
   const tempBranchName = `temp-${commit}`;
   await spawnProcess("git", ["checkout", "-b", tempBranchName, commit], { cwd: repo });
 
diff --git a/scripts/generate-clients/config.js b/scripts/generate-clients/config.js
index e7ac552eb5be..caea414e3d5b 100644
--- a/scripts/generate-clients/config.js
+++ b/scripts/generate-clients/config.js
@@ -1,4 +1,5 @@
 // Update this commit when taking up new changes from smithy-typescript.
 module.exports = {
-  SMITHY_TS_COMMIT: "d942a87",
+  // Use full commit hash as we explcitly fetch it.
+  SMITHY_TS_COMMIT: "d942a87081c0ca101f77b2336042773b26b0b9b1",
 };