diff --git a/lambdipy/__init__.py b/lambdipy/__init__.py
index aa4e5a0..cc4b294 100644
--- a/lambdipy/__init__.py
+++ b/lambdipy/__init__.py
@@ -1 +1 @@
-__version__ = 'v0.1.1'
+__version__ = 'v0.1.2'
diff --git a/lambdipy/cli.py b/lambdipy/cli.py
index bfcd109..2b30b42 100644
--- a/lambdipy/cli.py
+++ b/lambdipy/cli.py
@@ -41,13 +41,15 @@ def version():
 
 @cli.command()
 @click.option('--from-pipenv', '-p', is_flag=True, help='Build dependencies from Pipfile.lock')
+@click.option('--dev', '-d', is_flag=True, help='If dependencies are built from Pipfile.lock, include development '
+                                                'dependencies as well.')
 @click.option('--include', '-i', multiple=True, help='Include these paths in the final build')
 @click.option('--keep-tests', '-t', multiple=True, help='Exclude deletions of tests for these packages')
 @click.option('--no-docker', '-x', is_flag=True, help='Do not use Docker for package build (lambdipy itself runs in '
                                                       'lambci/lambda:build-python{PYTHON_VERSION} container)')
-def build(from_pipenv, include, keep_tests, no_docker):
+def build(from_pipenv, dev, include, keep_tests, no_docker):
     if from_pipenv:
-        requirements = parse_requirements(get_requirements_from_pipenv())
+        requirements = parse_requirements(get_requirements_from_pipenv(dev))
     else:
         requirements = parse_requirements(open('requirements.txt').read())
 
diff --git a/lambdipy/project_build.py b/lambdipy/project_build.py
index 82f8a78..6d1e83e 100644
--- a/lambdipy/project_build.py
+++ b/lambdipy/project_build.py
@@ -33,8 +33,12 @@ def __init__(self, requirement, potential_candidates):
         self.potential_candidates = potential_candidates
 
 
-def get_requirements_from_pipenv():
-    with os.popen("pipenv lock -r") as pipenv_subprocess:
+def get_requirements_from_pipenv(dev):
+    if dev:
+        command = "{ pipenv lock --dev -r & pipenv lock -r; }"
+    else:
+        command = "pipenv lock -r"
+    with os.popen(command) as pipenv_subprocess:
         return pipenv_subprocess.read()