diff --git a/lib/Action.js b/lib/Action.js
index dc49bf2..ac7a4d0 100644
--- a/lib/Action.js
+++ b/lib/Action.js
@@ -9,6 +9,7 @@ var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, ge
     });
 };
 Object.defineProperty(exports, "__esModule", { value: true });
+const ErrorMessage_1 = require("./ErrorMessage");
 class Action {
     constructor(inputs, releases, uploader) {
         this.inputs = inputs;
@@ -17,12 +18,45 @@ class Action {
     }
     perform() {
         return __awaiter(this, void 0, void 0, function* () {
-            const createResult = yield this.releases.create(this.inputs.tag, this.inputs.body, this.inputs.commit, this.inputs.draft, this.inputs.name);
+            const uploadUrl = yield this.createOrUpdateRelease();
             const artifacts = this.inputs.artifacts;
             if (artifacts.length > 0) {
-                yield this.uploader.uploadArtifacts(artifacts, createResult.data.upload_url);
+                yield this.uploader.uploadArtifacts(artifacts, uploadUrl);
             }
         });
     }
+    createOrUpdateRelease() {
+        return __awaiter(this, void 0, void 0, function* () {
+            try {
+                return yield this.createRelease();
+            }
+            catch (error) {
+                if (this.releaseAlreadyExisted(error) && this.inputs.allowUpdates) {
+                    return this.updateRelease();
+                }
+                else {
+                    throw error;
+                }
+            }
+        });
+    }
+    createRelease() {
+        return __awaiter(this, void 0, void 0, function* () {
+            const response = yield this.releases.create(this.inputs.tag, this.inputs.body, this.inputs.commit, this.inputs.draft, this.inputs.name);
+            return response.data.upload_url;
+        });
+    }
+    releaseAlreadyExisted(error) {
+        const errorMessage = new ErrorMessage_1.ErrorMessage(error);
+        return errorMessage.hasErrorWithCode('already_exists');
+    }
+    updateRelease() {
+        return __awaiter(this, void 0, void 0, function* () {
+            const getResponse = yield this.releases.getByTag(this.inputs.tag);
+            const id = getResponse.data.id;
+            const response = yield this.releases.update(id, this.inputs.tag, this.inputs.body, this.inputs.commit, this.inputs.draft, this.inputs.name);
+            return response.data.upload_url;
+        });
+    }
 }
 exports.Action = Action;
diff --git a/lib/ErrorMessage.js b/lib/ErrorMessage.js
index 588c064..e0fd1a5 100644
--- a/lib/ErrorMessage.js
+++ b/lib/ErrorMessage.js
@@ -4,18 +4,9 @@ const GithubError_1 = require("./GithubError");
 class ErrorMessage {
     constructor(error) {
         this.error = error;
+        this.githubErrors = this.generateGithubErrors();
     }
-    toString() {
-        const message = this.error.message;
-        const errors = this.githubErrors();
-        if (errors.length > 0) {
-            return `${message}\nErrors:\n${this.errorBulletedList(errors)}`;
-        }
-        else {
-            return message;
-        }
-    }
-    githubErrors() {
+    generateGithubErrors() {
         const errors = this.error.errors;
         if (errors instanceof Array) {
             return errors.map((err) => new GithubError_1.GithubError(err));
@@ -24,6 +15,19 @@ class ErrorMessage {
             return [];
         }
     }
+    hasErrorWithCode(code) {
+        return this.githubErrors.some((err) => err.code == code);
+    }
+    toString() {
+        const message = this.error.message;
+        const errors = this.githubErrors;
+        if (errors.length > 0) {
+            return `${message}\nErrors:\n${this.errorBulletedList(errors)}`;
+        }
+        else {
+            return message;
+        }
+    }
     errorBulletedList(errors) {
         return errors.map((err) => `- ${err}`).join("\n");
     }
diff --git a/lib/GithubError.js b/lib/GithubError.js
index 36358eb..40ea7c4 100644
--- a/lib/GithubError.js
+++ b/lib/GithubError.js
@@ -4,6 +4,9 @@ class GithubError {
     constructor(error) {
         this.error = error;
     }
+    get code() {
+        return this.error.code;
+    }
     toString() {
         const code = this.error.code;
         switch (code) {
diff --git a/lib/Inputs.js b/lib/Inputs.js
index 1885922..d995e36 100644
--- a/lib/Inputs.js
+++ b/lib/Inputs.js
@@ -14,6 +14,10 @@ class CoreInputs {
         this.artifactGlobber = artifactGlobber;
         this.context = context;
     }
+    get allowUpdates() {
+        const allow = core.getInput('allowUpdates');
+        return allow == 'true';
+    }
     get artifacts() {
         let artifacts = core.getInput('artifacts');
         if (!artifacts) {
diff --git a/lib/Releases.js b/lib/Releases.js
index d139dc3..d6499b4 100644
--- a/lib/Releases.js
+++ b/lib/Releases.js
@@ -27,6 +27,29 @@ class GithubReleases {
             });
         });
     }
+    getByTag(tag) {
+        return __awaiter(this, void 0, void 0, function* () {
+            return this.git.repos.getReleaseByTag({
+                owner: this.context.repo.owner,
+                repo: this.context.repo.repo,
+                tag: tag
+            });
+        });
+    }
+    update(id, tag, body, commitHash, draft, name) {
+        return __awaiter(this, void 0, void 0, function* () {
+            return this.git.repos.updateRelease({
+                release_id: id,
+                body: body,
+                name: name,
+                draft: draft,
+                owner: this.context.repo.owner,
+                repo: this.context.repo.repo,
+                target_commitish: commitHash,
+                tag_name: tag
+            });
+        });
+    }
     uploadArtifact(assetUrl, contentLength, contentType, file, name) {
         return __awaiter(this, void 0, void 0, function* () {
             return this.git.repos.uploadReleaseAsset({
diff --git a/package.json b/package.json
index 0842375..fff34be 100644
--- a/package.json
+++ b/package.json
@@ -7,8 +7,8 @@
   "scripts": {
     "build": "tsc",
     "clean": "rm -rf lib/*",
-    "debug": "yarn install && yarn build",
-    "release": "yarn install --production && yarn build",
+    "debug": "yarn clean && yarn install && yarn build",
+    "release": "yarn clean && yarn install --production && yarn build",
     "test": "jest"
   },
   "repository": {
@@ -25,14 +25,14 @@
   "dependencies": {
     "@actions/core": "^1.0.0",
     "@actions/github": "^1.0.0",
+    "@types/glob": "^7.1.1",
+    "@types/node": "^12.0.4",
     "add": "^2.0.6",
     "glob": "^7.1.4",
     "global": "^4.4.0"
   },
   "devDependencies": {
-    "@types/glob": "^7.1.1",
     "@types/jest": "^24.0.13",
-    "@types/node": "^12.0.4",
     "jest": "^24.8.0",
     "jest-circus": "^24.7.1",
     "ts-jest": "^24.0.2",