diff --git a/lib/utils.js b/lib/utils.js
index f015135c04..895e9d04d4 100644
--- a/lib/utils.js
+++ b/lib/utils.js
@@ -31,11 +31,14 @@ function isMaintenanceRange(range) {
 }
 
 function getUpperBound(range) {
-  return semver.valid(range)
+  const result = semver.valid(range)
     ? range
-    : ((semver.validRange(range) || '').match(/<(?<upperBound>\d+\.\d+\.\d+-\d+)$/) || [])[1]
-        // https://github.com/npm/node-semver/issues/322
-        .replace(/-\d+$/, '');
+    : ((semver.validRange(range) || '').match(/<(?<upperBound>\d+\.\d+\.\d+(-\d+)?)$/) || [])[1];
+
+  return result
+    ? // https://github.com/npm/node-semver/issues/322
+      result.replace(/-\d+$/, '')
+    : result;
 }
 
 function getLowerBound(range) {
diff --git a/test/utils.test.js b/test/utils.test.js
index 0f609eb3b2..7ff6d2429c 100644
--- a/test/utils.test.js
+++ b/test/utils.test.js
@@ -71,17 +71,17 @@ test('isMaintenanceRange', (t) => {
 
 test('getUpperBound', (t) => {
   t.is(getUpperBound('1.x.x'), '2.0.0');
-  // T.is(getUpperBound('1.X.X'), '2.0.0');
-  // t.is(getUpperBound('10.x.x'), '11.0.0');
-  // t.is(getUpperBound('1.x'), '2.0.0');
-  // t.is(getUpperBound('10.x'), '11.0.0');
-  // t.is(getUpperBound('1.0.x'), '1.1.0');
-  // t.is(getUpperBound('10.0.x'), '10.1.0');
-  // t.is(getUpperBound('10.10.x'), '10.11.0');
-  // t.is(getUpperBound('1.0.0'), '1.0.0');
-  // t.is(getUpperBound('10.0.0'), '10.0.0');
-
-  // t.is(getUpperBound('foo'), undefined);
+  t.is(getUpperBound('1.X.X'), '2.0.0');
+  t.is(getUpperBound('10.x.x'), '11.0.0');
+  t.is(getUpperBound('1.x'), '2.0.0');
+  t.is(getUpperBound('10.x'), '11.0.0');
+  t.is(getUpperBound('1.0.x'), '1.1.0');
+  t.is(getUpperBound('10.0.x'), '10.1.0');
+  t.is(getUpperBound('10.10.x'), '10.11.0');
+  t.is(getUpperBound('1.0.0'), '1.0.0');
+  t.is(getUpperBound('10.0.0'), '10.0.0');
+
+  t.is(getUpperBound('foo'), undefined);
 });
 
 test('getLowerBound', (t) => {