diff --git a/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php b/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
index 4165f8d..a923c5a 100644
--- a/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
+++ b/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
@@ -34,7 +34,8 @@ public function process(string $composerJsonContents): ChangedPackageVersionsRes
 
         // iterate require and require-dev sections and check if installed version is newer one than in composer.json
         // if so, replace it
-        foreach ($composerJson['require'] ?? [] as $packageName => $packageVersion) {
+        $requiredPackagesToVersions = array_merge($composerJson['require'] ?? [], $composerJson['require-dev'] ?? []);
+        foreach ($requiredPackagesToVersions as $packageName => $packageVersion) {
             if (! isset($installedPackagesToVersions[$packageName])) {
                 continue;
             }