diff --git a/README.md b/README.md
index d218fe2..68534c8 100644
--- a/README.md
+++ b/README.md
@@ -182,7 +182,7 @@ If you have an `action.yml` present, our config will attempt to adjust the conta
 
 Unless you have a `manifest.json` present in your root folder, this module is not added to the release config.
 
-If you have a `manifest.json` present, our config will attempt to adjust the `version` value to the newly pushed `npm` and `docker` tags.
+If you have a `manifest.json` present, our config will attempt to adjust the `version` value to the newly pushed `npm` and `docker` tags. This version bump is limited to releases made exclusively on the `main` branch.
 
 ### Docker
 
diff --git a/release.config.js b/release.config.js
index 8f293b7..d40c10b 100644
--- a/release.config.js
+++ b/release.config.js
@@ -34,6 +34,7 @@ const noteKeywords = [
 const {
   GITHUB_SHA,
   GITHUB_REPOSITORY,
+  GITHUB_REF,
   GIT_COMMITTER_NAME,
   GIT_COMMITTER_EMAIL,
   GIT_AUTHOR_NAME,
@@ -141,7 +142,7 @@ if (actionExists) {
 }
 
 const manifestExists = existsSync("./manifest.json");
-if (manifestExists) {
+if (manifestExists && GITHUB_REF === "refs/heads/main") {
   addPlugin("@google/semantic-release-replace-plugin", {
     "replacements": [{
       "files": [