diff --git a/__tests__/util.test.ts b/__tests__/util.test.ts
index acdd18c..b9ef583 100644
--- a/__tests__/util.test.ts
+++ b/__tests__/util.test.ts
@@ -52,7 +52,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true",
+          input_make_latest: undefined,
         })
       );
     });
@@ -73,7 +73,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true",
+          input_make_latest: undefined,
         })
       );
     });
@@ -94,7 +94,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true",
+          input_make_latest: undefined,
         })
       );
     });
@@ -128,7 +128,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true"
+          input_make_latest: undefined
         }
       );
     });
@@ -154,7 +154,7 @@ describe("util", () => {
           input_target_commitish: "affa18ef97bc9db20076945705aba8c516139abd",
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true"
+          input_make_latest: undefined
         }
       );
     });
@@ -179,7 +179,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: "releases",
           input_generate_release_notes: false,
-          input_make_latest: "true"
+          input_make_latest: undefined
         }
       );
     });
@@ -205,7 +205,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: true,
-          input_make_latest: "true"
+          input_make_latest: undefined
         }
       );
     });
@@ -234,7 +234,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true"
+          input_make_latest: undefined
         }
       );
     });
@@ -261,7 +261,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true"
+          input_make_latest: undefined
         }
       );
     });
@@ -287,7 +287,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true"
+          input_make_latest: undefined
         }
       );
     });
@@ -337,7 +337,7 @@ describe("util", () => {
           input_target_commitish: undefined,
           input_discussion_category_name: undefined,
           input_generate_release_notes: false,
-          input_make_latest: "true"
+          input_make_latest: undefined
         }
       );
     });
diff --git a/src/util.ts b/src/util.ts
index cf6b6b4..4e3a5c4 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -19,7 +19,7 @@ export interface Config {
   input_discussion_category_name?: string;
   input_generate_release_notes?: boolean;
   input_append_body?: boolean;
-  input_make_latest: string;
+  input_make_latest: string | undefined;
 }
 
 export const uploadUrl = (url: string): string => {
@@ -71,7 +71,7 @@ export const parseConfig = (env: Env): Config => {
       env.INPUT_DISCUSSION_CATEGORY_NAME || undefined,
     input_generate_release_notes: env.INPUT_GENERATE_RELEASE_NOTES == "true",
     input_append_body: env.INPUT_APPEND_BODY == "true",
-    input_make_latest: env.INPUT_MAKE_LATEST ? env.INPUT_MAKE_LATEST : "true",
+    input_make_latest: env.INPUT_MAKE_LATEST ? env.INPUT_MAKE_LATEST : undefined,
   };
 };