diff --git a/dist/index.js b/dist/index.js
index 6e38c5f..3b43798 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -13689,7 +13689,7 @@ class SemVer {
 
     if (version instanceof SemVer) {
       if (version.loose === !!options.loose &&
-          version.includePrerelease === !!options.includePrerelease) {
+        version.includePrerelease === !!options.includePrerelease) {
         return version
       } else {
         version = version.version
@@ -13855,6 +13855,19 @@ class SemVer {
   // preminor will bump the version up to the next minor release, and immediately
   // down to pre-release. premajor and prepatch work the same way.
   inc (release, identifier, identifierBase) {
+    if (release.startsWith('pre')) {
+      if (!identifier && identifierBase === false) {
+        throw new Error('invalid increment argument: identifier is empty')
+      }
+      // Avoid an invalid semver results
+      if (identifier) {
+        const match = `-${identifier}`.match(this.options.loose ? re[t.PRERELEASELOOSE] : re[t.PRERELEASE])
+        if (!match || match[1] !== identifier) {
+          throw new Error(`invalid identifier: ${identifier}`)
+        }
+      }
+    }
+
     switch (release) {
       case 'premajor':
         this.prerelease.length = 0
@@ -13885,6 +13898,12 @@ class SemVer {
         }
         this.inc('pre', identifier, identifierBase)
         break
+      case 'release':
+        if (this.prerelease.length === 0) {
+          throw new Error(`version ${this.raw} is not a prerelease`)
+        }
+        this.prerelease.length = 0
+        break
 
       case 'major':
         // If this is a pre-major version, bump up to the same major version.
@@ -13928,10 +13947,6 @@ class SemVer {
       case 'pre': {
         const base = Number(identifierBase) ? 1 : 0
 
-        if (!identifier && identifierBase === false) {
-          throw new Error('invalid increment argument: identifier is empty')
-        }
-
         if (this.prerelease.length === 0) {
           this.prerelease = [base]
         } else {
@@ -14190,20 +14205,13 @@ const diff = (version1, version2) => {
       return 'major'
     }
 
-    // Otherwise it can be determined by checking the high version
-
-    if (highVersion.patch) {
-      // anything higher than a patch bump would result in the wrong version
+    // If the main part has no difference
+    if (lowVersion.compareMain(highVersion) === 0) {
+      if (lowVersion.minor && !lowVersion.patch) {
+        return 'minor'
+      }
       return 'patch'
     }
-
-    if (highVersion.minor) {
-      // anything higher than a minor bump would result in the wrong version
-      return 'minor'
-    }
-
-    // bumping major/minor/patch all have same result
-    return 'major'
   }
 
   // add the `pre` prefix if we are going to a prerelease version