diff --git a/CHANGELOG.md b/CHANGELOG.md
index eafdc72a3..d366de99b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,12 @@
 # Changelog
 
+### [3.4.5](https://github.com/amannn/action-semantic-pull-request/compare/v3.4.4...v3.4.5) (2021-10-28)
+
+
+### Bug Fixes
+
+* Consider merge commits for single commit validation ([#131](https://github.com/amannn/action-semantic-pull-request/issues/131)) ([5265383](https://github.com/amannn/action-semantic-pull-request/commit/526538350f2e4eaaac841e586a197de6b019af1f)), closes [#108](https://github.com/amannn/action-semantic-pull-request/issues/108)
+
 ### [3.4.4](https://github.com/amannn/action-semantic-pull-request/compare/v3.4.3...v3.4.4) (2021-10-26)
 
 
diff --git a/dist/index.js b/dist/index.js
index 5ed2f0263..5ff5dc42e 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -33338,16 +33338,37 @@ module.exports = async function run() {
         });
 
         if (validateSingleCommit) {
-          const {data: commits} = await client.pulls.listCommits({
-            owner,
-            repo,
-            pull_number: contextPullRequest.number,
-            per_page: 2
-          });
+          const commits = [];
+          let nonMergeCommits = [];
+
+          for await (const response of client.paginate.iterator(
+            client.pulls.listCommits,
+            {
+              owner,
+              repo,
+              pull_number: contextPullRequest.number
+            }
+          )) {
+            commits.push(...response.data);
+
+            // GitHub does not count merge commits when deciding whether to use
+            // the PR title or a commit message for the squash commit message.
+            nonMergeCommits = commits.filter(
+              (commit) => !commit.commit.message.startsWith('Merge branch')
+            );
+
+            // We only need two non-merge commits to know that the PR
+            // title won't be used.
+            if (nonMergeCommits.length >= 2) break;
+          }
 
-          if (commits.length === 1) {
+          // If there is only one (non merge) commit present, GitHub will use
+          // that commit rather than the PR title for the title of a squash
+          // commit. To make sure a semantic title is used for the squash
+          // commit, we need to validate the commit title.
+          if (nonMergeCommits.length === 1) {
             try {
-              await validatePrTitle(commits[0].commit.message, {
+              await validatePrTitle(nonMergeCommits[0].commit.message, {
                 types,
                 scopes,
                 requireScope,