diff --git a/app/watchers/providers/docker/Docker.ts b/app/watchers/providers/docker/Docker.ts
index b6273a72..b8986cf7 100644
--- a/app/watchers/providers/docker/Docker.ts
+++ b/app/watchers/providers/docker/Docker.ts
@@ -112,7 +112,7 @@ function getTagCandidates(
         // Prefix is almost-always standardised around "must stay the same" for tags
         if (!container.includeTags) {
             const currentTag = container.image.tag.value;
-            const match = currentTag.match(/^(.*?)(\d+.*)$/);
+            const match = currentTag.match(/^(.*?)(\d+\.\d+\.\d+.*)$/);
             const currentPrefix = match ? match[1] : '';
 
             if (currentPrefix) {