This is the replication package for our article "A Formal Framework for Measuring Technical Lag in Component Repositories --- and its Application to npm" submitted for the JSEP journal in 2018. This replication package requires Python 3.5+ to be installed, and all the dependencies listed in ``requirements.txt``. They can be automatically installed using ``pip install -r requirements.txt``. These experiment were executed on a Linux Ubuntu OS. To obtain the analysis used in the paper, one should execute ``jupyter notebook`` at the root of this replication package, and open the notebook contained in ``notebooks``. This replication package contains three folders (i.e scripts, notebooks and data), each folder has a README with a description of what it contains. The list of all npm package releases and Github repositories with their dependencies was download from the last available dataset of libraries.io: https://zenodo.org/record/1196312 The data is under the Creative Commons Attribution Share-Alike 4.0 license. The source code is under the GNU General Public License. For any more information about the details of these experiments, please contact: ahmed.zerouali73@gmail.com