diff --git a/lib/workers/branch/npm.js b/lib/workers/branch/npm.js
index 6b157a028fd11694d75df4fb04c17de8e436532c..49756b144e5d2857c415a4b8488ac190a85ac613 100644
--- a/lib/workers/branch/npm.js
+++ b/lib/workers/branch/npm.js
@@ -14,7 +14,7 @@ async function generateLockFile(tmpDir, logger) {
     result = cp.spawnSync('npm', ['install', '--ignore-scripts'], {
       cwd: tmpDir,
       shell: true,
-      env: { ...process.env, ...{ NODE_ENV: 'dev' } },
+      env: { NODE_ENV: 'dev' },
     });
     logger.debug(`npm stdout:\n${String(result.stdout)}`);
     logger.debug(`pm stderr:\n${String(result.stderr)}`);
diff --git a/lib/workers/branch/yarn.js b/lib/workers/branch/yarn.js
index 5e052d9bd20e70cb9db906af59e32eb34c1b100f..a275fa5457700f72e6d23ee58301050ead2d7d89 100644
--- a/lib/workers/branch/yarn.js
+++ b/lib/workers/branch/yarn.js
@@ -18,7 +18,7 @@ async function generateLockFile(tmpDir, logger) {
     result = cp.spawnSync('node', yarnOptions, {
       cwd: tmpDir,
       shell: true,
-      env: { ...process.env, ...{ NODE_ENV: 'dev' } },
+      env: { NODE_ENV: 'dev' },
     });
     logger.debug(`yarn stdout:\n${String(result.stdout)}`);
     logger.debug(`yarn stderr:\n${String(result.stderr)}`);