diff --git a/CHANGELOG.md b/CHANGELOG.md
index 609495e0..02179b41 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,7 +22,7 @@ All notable changes to this project will be documented in this file, in reverse
 
 ### Fixed
 
-- Nothing.
+- [#55](https://github.com/laminas/automatic-releases/pull/55) fixes issues with identifying and retrieving `CHANGELOG.md` contents from non-default branches.
 
 ## 1.2.3 - 2020-08-13
 
diff --git a/src/Changelog/BumpAndCommitChangelogVersionViaKeepAChangelog.php b/src/Changelog/BumpAndCommitChangelogVersionViaKeepAChangelog.php
index ca71ffbf..5d018459 100644
--- a/src/Changelog/BumpAndCommitChangelogVersionViaKeepAChangelog.php
+++ b/src/Changelog/BumpAndCommitChangelogVersionViaKeepAChangelog.php
@@ -53,7 +53,7 @@ public function __invoke(
     ): void {
         if (! ($this->changelogExists)($sourceBranch, $repositoryDirectory)) {
             // No changelog
-            $this->logger->info('BumpAndCommitChangelog: No CHANGELOG.md file detected');
+            $this->logger->info('BumpAndCommitChangelogVersion: No CHANGELOG.md file detected');
 
             return;
         }
@@ -81,7 +81,7 @@ public function __invoke(
         ($this->push)($repositoryDirectory, $sourceBranch->name());
 
         $this->logger->info(sprintf(
-            'BumpAndCommitChangelog: bumped %s to version %s in branch %s',
+            'BumpAndCommitChangelogVersion: bumped %s to version %s in branch %s',
             self::CHANGELOG_FILE,
             $newVersion,
             $sourceBranch->name()
diff --git a/src/Changelog/ChangelogExistsViaConsole.php b/src/Changelog/ChangelogExistsViaConsole.php
index 4161e03b..ad0b3482 100644
--- a/src/Changelog/ChangelogExistsViaConsole.php
+++ b/src/Changelog/ChangelogExistsViaConsole.php
@@ -16,7 +16,7 @@ public function __invoke(
         BranchName $sourceBranch,
         string $repositoryDirectory
     ): bool {
-        $process = new Process(['git', 'show', $sourceBranch->name() . ':CHANGELOG.md'], $repositoryDirectory);
+        $process = new Process(['git', 'show', 'origin/' . $sourceBranch->name() . ':CHANGELOG.md'], $repositoryDirectory);
         $process->run();
 
         return $process->isSuccessful();
diff --git a/src/Changelog/CommitReleaseChangelogViaKeepAChangelog.php b/src/Changelog/CommitReleaseChangelogViaKeepAChangelog.php
index 5bcd8b20..15e32ec6 100644
--- a/src/Changelog/CommitReleaseChangelogViaKeepAChangelog.php
+++ b/src/Changelog/CommitReleaseChangelogViaKeepAChangelog.php
@@ -63,7 +63,7 @@ public function __invoke(
     ): void {
         if (! ($this->changelogExists)($sourceBranch, $repositoryDirectory)) {
             // No changelog
-            $this->logger->info('No CHANGELOG.md file detected');
+            $this->logger->info('CommitReleaseChangelog: No CHANGELOG.md file detected');
 
             return;
         }
@@ -99,7 +99,7 @@ private function updateChangelog(string $changelogFile, string $versionString):
 
         if ($event->failed()) {
             $this->logger->info(sprintf(
-                'Failed to find release version "%s" in "%s"',
+                'CommitReleaseChangelog: Failed to find release version "%s" in "%s"',
                 $versionString,
                 $changelogFile
             ));
@@ -111,7 +111,7 @@ private function updateChangelog(string $changelogFile, string $versionString):
 
         if ($event->failed()) {
             $this->logger->info(sprintf(
-                'Failed setting release date for version "%s" in "%s"',
+                'CommitReleaseChangelog: Failed setting release date for version "%s" in "%s"',
                 $versionString,
                 $changelogFile
             ));
@@ -120,7 +120,7 @@ private function updateChangelog(string $changelogFile, string $versionString):
         }
 
         $this->logger->info(sprintf(
-            'Set release date for version "%s" in "%s" to "%s"',
+            'CommitReleaseChangelog: Set release date for version "%s" in "%s" to "%s"',
             $versionString,
             $changelogFile,
             $this->clock->now()->format('Y-m-d')
diff --git a/src/Git/CommitFileViaConsole.php b/src/Git/CommitFileViaConsole.php
index 340f9efc..7fc2c159 100644
--- a/src/Git/CommitFileViaConsole.php
+++ b/src/Git/CommitFileViaConsole.php
@@ -45,9 +45,10 @@ private function assertWeAreOnBranch(
         $output = trim($process->getOutput());
 
         Assert::same($output, $expectedBranch->name(), sprintf(
-            'Cannot commit file %s to branch %s, as a different branch is currently checked out.',
+            'CommitFile: Cannot commit file %s to branch %s, as a different branch is currently checked out (%s).',
             $filename,
-            $expectedBranch->name()
+            $expectedBranch->name(),
+            $output
         ));
     }
 }
diff --git a/src/Github/CreateReleaseTextViaKeepAChangelog.php b/src/Github/CreateReleaseTextViaKeepAChangelog.php
index 43672ad8..5c325b20 100644
--- a/src/Github/CreateReleaseTextViaKeepAChangelog.php
+++ b/src/Github/CreateReleaseTextViaKeepAChangelog.php
@@ -76,7 +76,7 @@ private function fetchChangelogContentsFromBranch(
         BranchName $sourceBranch,
         string $repositoryDirectory
     ): string {
-        $process = new Process(['git', 'show', $sourceBranch->name() . ':CHANGELOG.md'], $repositoryDirectory);
+        $process = new Process(['git', 'show', 'origin/' . $sourceBranch->name() . ':CHANGELOG.md'], $repositoryDirectory);
         $process->mustRun();
 
         $contents = $process->getOutput();
diff --git a/test/unit/Changelog/ChangelogExistsViaConsoleTest.php b/test/unit/Changelog/ChangelogExistsViaConsoleTest.php
index 756e6359..8e564616 100644
--- a/test/unit/Changelog/ChangelogExistsViaConsoleTest.php
+++ b/test/unit/Changelog/ChangelogExistsViaConsoleTest.php
@@ -20,20 +20,24 @@ class ChangelogExistsViaConsoleTest extends TestCase
 {
     public function testReturnsFalseWhenChangelogIsNotPresentInBranch(): void
     {
+        $repository = $this->createMockRepositoryWithChangelog();
+        $workingDir = $this->checkoutMockRepositoryWithChangelog($repository);
         self::assertFalse(
             (new ChangelogExistsViaConsole())(
                 BranchName::fromName('0.99.x'),
-                $this->createMockRepositoryWithChangelog()
+                $workingDir
             )
         );
     }
 
     public function testReturnsTrueWhenChangelogIsPresentInBranch(): void
     {
+        $repository = $this->createMockRepositoryWithChangelog();
+        $workingDir = $this->checkoutMockRepositoryWithChangelog($repository);
         self::assertTrue(
             (new ChangelogExistsViaConsole())(
                 BranchName::fromName('1.0.x'),
-                $this->createMockRepositoryWithChangelog()
+                $workingDir
             )
         );
     }
@@ -90,4 +94,19 @@ private function createMockRepositoryWithChangelog(): string
 
         return $repo;
     }
+
+    /**
+     * @psalm-param non-empty-string $origin
+     * @psalm-return non-empty-string
+     */
+    private function checkoutMockRepositoryWithChangelog(string $origin): string
+    {
+        $repo = tempnam(sys_get_temp_dir(), 'CreateReleaseTextViaKeepAChangelog');
+        Assert::notEmpty($repo);
+        unlink($repo);
+
+        (new Process(['git', 'clone', $origin, $repo]))->mustRun();
+
+        return $repo;
+    }
 }
diff --git a/test/unit/Changelog/ReleaseChangelogViaKeepAChangelogTest.php b/test/unit/Changelog/ReleaseChangelogViaKeepAChangelogTest.php
index 9b967224..c8dbfab7 100644
--- a/test/unit/Changelog/ReleaseChangelogViaKeepAChangelogTest.php
+++ b/test/unit/Changelog/ReleaseChangelogViaKeepAChangelogTest.php
@@ -86,13 +86,14 @@ public function testNoOpWhenChangelogFileDoesNotExist(): void
 
     public function testNoOpWhenUnableToFindMatchingChangelogEntry(): void
     {
-        $repo   = $this->createMockRepositoryWithChangelog(self::INVALID_CHANGELOG);
-        $branch = BranchName::fromName('1.0.x');
+        $repo     = $this->createMockRepositoryWithChangelog(self::INVALID_CHANGELOG);
+        $checkout = $this->checkoutMockRepositoryWithChangelog($repo);
+        $branch   = BranchName::fromName('1.0.x');
 
         $this->checkoutBranch
             ->expects($this->once())
             ->method('__invoke')
-            ->with($repo, $branch);
+            ->with($checkout, $branch);
 
         $this
             ->logger
@@ -104,7 +105,7 @@ public function testNoOpWhenUnableToFindMatchingChangelogEntry(): void
 
         self::assertNull(
             $this->releaseChangelog->__invoke(
-                $repo,
+                $checkout,
                 SemVerVersion::fromMilestoneName('1.0.0'),
                 $branch
             )
@@ -113,13 +114,14 @@ public function testNoOpWhenUnableToFindMatchingChangelogEntry(): void
 
     public function testNoOpWhenFailedToSetReleaseDateInChangelogEntry(): void
     {
-        $repo   = $this->createMockRepositoryWithChangelog(self::RELEASED_CHANGELOG);
-        $branch = BranchName::fromName('1.0.x');
+        $repo     = $this->createMockRepositoryWithChangelog(self::RELEASED_CHANGELOG);
+        $checkout = $this->checkoutMockRepositoryWithChangelog($repo);
+        $branch   = BranchName::fromName('1.0.x');
 
         $this->checkoutBranch
             ->expects($this->once())
             ->method('__invoke')
-            ->with($repo, $branch);
+            ->with($checkout, $branch);
 
         $this
             ->logger
@@ -131,7 +133,7 @@ public function testNoOpWhenFailedToSetReleaseDateInChangelogEntry(): void
 
         self::assertNull(
             $this->releaseChangelog->__invoke(
-                $repo,
+                $checkout,
                 SemVerVersion::fromMilestoneName('1.0.0'),
                 $branch
             )
@@ -143,12 +145,13 @@ public function testWritesCommitsAndPushesChangelogWhenFoundAndReadyToRelease():
         $existingChangelog = sprintf(self::READY_CHANGELOG, 'TBD');
         $expectedChangelog = sprintf(self::READY_CHANGELOG, $this->clock->now()->format('Y-m-d'));
         $repositoryPath    = $this->createMockRepositoryWithChangelog($existingChangelog);
+        $checkout          = $this->checkoutMockRepositoryWithChangelog($repositoryPath);
         $sourceBranch      = BranchName::fromName('1.0.x');
 
         $this->checkoutBranch
             ->expects($this->once())
             ->method('__invoke')
-            ->with($repositoryPath, $sourceBranch);
+            ->with($checkout, $sourceBranch);
 
         $this
             ->logger
@@ -160,7 +163,7 @@ public function testWritesCommitsAndPushesChangelogWhenFoundAndReadyToRelease():
             ->expects($this->once())
             ->method('__invoke')
             ->with(
-                $this->equalTo($repositoryPath),
+                $this->equalTo($checkout),
                 $this->equalTo($sourceBranch),
                 $this->equalTo('CHANGELOG.md'),
                 $this->stringContains('1.0.0 readiness')
@@ -170,19 +173,19 @@ public function testWritesCommitsAndPushesChangelogWhenFoundAndReadyToRelease():
             ->expects($this->once())
             ->method('__invoke')
             ->with(
-                $this->equalTo($repositoryPath),
+                $this->equalTo($checkout),
                 $this->equalTo('1.0.x'),
             );
 
         self::assertNull(
             $this->releaseChangelog->__invoke(
-                $repositoryPath,
+                $checkout,
                 SemVerVersion::fromMilestoneName('1.0.0'),
                 BranchName::fromName('1.0.x')
             )
         );
 
-        $this->assertStringEqualsFile($repositoryPath . '/CHANGELOG.md', $expectedChangelog);
+        $this->assertStringEqualsFile($checkout . '/CHANGELOG.md', $expectedChangelog);
     }
 
     /**
@@ -213,6 +216,21 @@ private function createMockRepositoryWithChangelog(
         return $repo;
     }
 
+    /**
+     * @psalm-param non-empty-string $origin
+     * @psalm-return non-empty-string
+     */
+    private function checkoutMockRepositoryWithChangelog(string $origin): string
+    {
+        $repo = tempnam(sys_get_temp_dir(), 'CreateReleaseTextViaKeepAChangelog');
+        Assert::notEmpty($repo);
+        unlink($repo);
+
+        (new Process(['git', 'clone', $origin, $repo]))->mustRun();
+
+        return $repo;
+    }
+
     private const INVALID_CHANGELOG = <<< 'END'
         # NOT A CHANGELOG
 
diff --git a/test/unit/Github/CreateReleaseTextViaKeepAChangelogTest.php b/test/unit/Github/CreateReleaseTextViaKeepAChangelogTest.php
index f1f4abfa..15e5010a 100644
--- a/test/unit/Github/CreateReleaseTextViaKeepAChangelogTest.php
+++ b/test/unit/Github/CreateReleaseTextViaKeepAChangelogTest.php
@@ -29,6 +29,7 @@ public function testReportsCannotCreateReleaseTextIfChangelogFileIsMissing(): vo
             self::INVALID_CHANGELOG,
             'NOT-A-CHANGELOG.md'
         );
+        $workingPath    = $this->checkoutMockRepositoryWithChangelog($repositoryPath);
 
         self::assertFalse(
             (new CreateReleaseTextViaKeepAChangelog(new ChangelogExistsViaConsole()))
@@ -37,7 +38,7 @@ public function testReportsCannotCreateReleaseTextIfChangelogFileIsMissing(): vo
                     RepositoryName::fromFullName('example/repo'),
                     SemVerVersion::fromMilestoneName('1.0.0'),
                     BranchName::fromName('1.0.x'),
-                    $repositoryPath
+                    $workingPath
                 )
         );
     }
@@ -48,6 +49,7 @@ public function testReportsCannotCreateReleaseTextIfChangelogFileDoesNotContainV
             self::INVALID_CHANGELOG,
             'CHANGELOG.md'
         );
+        $workingPath    = $this->checkoutMockRepositoryWithChangelog($repositoryPath);
 
         self::assertFalse(
             (new CreateReleaseTextViaKeepAChangelog(new ChangelogExistsViaConsole()))
@@ -56,7 +58,7 @@ public function testReportsCannotCreateReleaseTextIfChangelogFileDoesNotContainV
                     RepositoryName::fromFullName('example/repo'),
                     SemVerVersion::fromMilestoneName('1.0.0'),
                     BranchName::fromName('1.0.x'),
-                    $repositoryPath
+                    $workingPath
                 )
         );
     }
@@ -68,6 +70,7 @@ public function testReportsCanCreateReleaseWhenChangelogWithVersionExists(): voi
             $changelogContents,
             'CHANGELOG.md'
         );
+        $workingPath       = $this->checkoutMockRepositoryWithChangelog($repositoryPath);
 
         self::assertTrue(
             (new CreateReleaseTextViaKeepAChangelog(new ChangelogExistsViaConsole()))
@@ -76,7 +79,7 @@ public function testReportsCanCreateReleaseWhenChangelogWithVersionExists(): voi
                     RepositoryName::fromFullName('example/repo'),
                     SemVerVersion::fromMilestoneName('1.0.0'),
                     BranchName::fromName('1.0.x'),
-                    $repositoryPath
+                    $workingPath
                 )
         );
     }
@@ -89,6 +92,7 @@ public function testExtractsReleaseTextViaChangelogFile(): void
             $changelogContents,
             'CHANGELOG.md'
         );
+        $workingPath       = $this->checkoutMockRepositoryWithChangelog($repositoryPath);
 
         $expected = sprintf(<<< 'END'
             ### Added
@@ -120,7 +124,7 @@ public function testExtractsReleaseTextViaChangelogFile(): void
                     RepositoryName::fromFullName('example/repo'),
                     SemVerVersion::fromMilestoneName('1.0.0'),
                     BranchName::fromName('1.0.x'),
-                    $repositoryPath
+                    $workingPath
                 )
         );
     }
@@ -170,6 +174,21 @@ private function createMockRepositoryWithChangelog(
         return $repo;
     }
 
+    /**
+     * @psalm-param non-empty-string $origin
+     * @psalm-return non-empty-string
+     */
+    private function checkoutMockRepositoryWithChangelog(string $origin): string
+    {
+        $repo = tempnam(sys_get_temp_dir(), 'CreateReleaseTextViaKeepAChangelog');
+        Assert::notEmpty($repo);
+        unlink($repo);
+
+        (new Process(['git', 'clone', $origin, $repo]))->mustRun();
+
+        return $repo;
+    }
+
     private const INVALID_CHANGELOG = <<< 'END'
         # NOT A CHANGELOG