diff --git a/src/helpers/fs.ts b/src/helpers/fs.ts
index fb14895..148a0c2 100644
--- a/src/helpers/fs.ts
+++ b/src/helpers/fs.ts
@@ -1,10 +1,14 @@
 import * as fs from 'fs';
 
+function isErrnoException(e: unknown): e is NodeJS.ErrnoException {
+    return ('code' in (e as any));
+}
+
 function dirExists(path: string): void {
     try {
         fs.mkdirSync(path);
     } catch (err) {
-        if (err.code !== 'EEXIST') {
+        if (isErrnoException(err) && err.code !== 'EEXIST') {
             throw err;
         }
     }
@@ -14,7 +18,7 @@ function removeDir(path: string) {
     try {
         fs.rmdirSync(path, { recursive: true });
     } catch (err) {
-        if (err.code !== 'ENOENT') {
+        if (isErrnoException(err) && err.code !== 'ENOENT') {
             throw err;
         }
     }
@@ -24,7 +28,7 @@ function removeFile(path: string) {
     try {
         fs.unlinkSync(path);
     } catch (err) {
-        if (err.code !== 'ENOENT') {
+        if (isErrnoException(err) && err.code !== 'ENOENT') {
             throw err;
         }
     }
diff --git a/src/helpers/git.ts b/src/helpers/git.ts
index 1b1bc03..5acf6ec 100644
--- a/src/helpers/git.ts
+++ b/src/helpers/git.ts
@@ -5,7 +5,7 @@ import { getExecOutput } from './github';
 async function ensureRemoteExists(name: string, target: string): Promise<void> {
     try {
         await exec('git', ['remote', 'add', name, target]);
-    } catch (e) {
+    } catch (e: any) {
         if ( ! e.message.match(/failed with exit code 3$/g)) {
             throw e;
         }
diff --git a/src/index.ts b/src/index.ts
index 994600b..bb3a2e4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -36,7 +36,7 @@ async function downloadSplitsh(): Promise<void> {
 
     await exec(`wget -O ${downloadPath} ${url}`);
     const output = await getExecOutput("sha256sum", [downloadPath]);
-    const hash = output.stdout.split(" ")[0];
+    const hash = output.split(" ")[0];
     if (hash !== "2539301ce5e21d0ca44b689d0dd2c1b20d9f9e996c1fe6c462afb8af4e7141cc") {
         throw new Error("Hash verification of downloaded splitsh failed");
     }