diff --git a/src/create-release.ts b/src/create-release.ts
index c0ba6e3b..429f2593 100644
--- a/src/create-release.ts
+++ b/src/create-release.ts
@@ -136,7 +136,9 @@ export async function createRelease(
 
   try {
     await exec('octo', args, options)
-  } catch (err) {
-    setFailed(err)
+  } catch (e: unknown) {
+    if (e instanceof Error) {
+      setFailed(e)
+    }
   }
 }
diff --git a/src/index.ts b/src/index.ts
index 8abb3c22..5d694698 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -6,8 +6,10 @@ async function run(): Promise<void> {
   try {
     const inputParameters = get()
     await createRelease(inputParameters)
-  } catch (error) {
-    setFailed(error.message)
+  } catch (e: unknown) {
+    if (e instanceof Error) {
+      setFailed(e)
+    }
   }
 }