diff --git a/header.tpl b/header.tpl
index 7f8facb..393b526 100644
--- a/header.tpl
+++ b/header.tpl
@@ -180,7 +180,7 @@
       <div class="menu-item">
         <img class="top-icon" src="img/update-icon.svg" alt="update icon"/>
         <a
-        href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2020-11-19</a>
+        href="https://github.com/NullHypothesis/censorbib/commits/master">Last update: 2021-9-13</a>
       </div>
       <div class="menu-item">
         <img class="top-icon" src="img/donate-icon.svg" alt="donate icon"/>
diff --git a/references.bib b/references.bib
index fa6727e..d3af77f 100644
--- a/references.bib
+++ b/references.bib
@@ -1,3 +1,104 @@
+@inproceedings{Padmanabhan2021a,
+	author = {Ramakrishna Padmanabhan and and Arturo Filast\`{o} and Maria Xynou and Ram Sundara Raman and Kennedy Middleton and Mingwei Zhang and Doug Madory and Molly Roberts and Alberto Dainotti},
+	title = {A multi-perspective view of {Internet} censorship in {Myanmar}},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {ACM},
+	year = {2021},
+	url = {https://dl.acm.org/doi/pdf/10.1145/3473604.3474562},
+}
+
+@inproceedings{Knockel2021a,
+	author = {Jeffrey Knockel and Lotus Ruan},
+	title = {Measuring {QQMail}'s Automated Email Censorship in {China}},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {ACM},
+	year = {2021},
+	url = {https://doi.org/10.1145/3473604.3474560},
+}
+
+@inproceedings{Kwan2021a,
+	author = {Carmen Kwan and Paul Janiszewski and Shela Qiu and Cathy Wang and Cecylia Bocovich},
+	title = {Exploring Simple Detection Techniques for {DNS}-over-{HTTPS} Tunnels},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {ACM},
+	year = {2021},
+	url = {https://doi.org/10.1145/3473604.3474563},
+}
+
+@inproceedings{Bock2021c,
+	author = {Kevin Bock and Gabriel Naval and Kyle Reese and Dave Levin},
+	title = {Even Censors Have a Backup: Examining {China}'s Double {HTTPS} Censorship Middleboxes},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {ACM},
+	year = {2021},
+	url = {https://doi.org/10.1145/3473604.3474559},
+}
+
+@inproceedings{Satija2021a,
+	author = {Sambhav Satija and Rahul Chatterjee},
+	title = {{BlindTLS}: Circumventing {TLS}-Based {HTTPS} Censorship},
+	booktitle = {Free and Open Communications on the Internet},
+	publisher = {ACM},
+	year = {2021},
+	url = {https://doi.org/10.1145/3473604.3474564},
+}
+
+@inproceedings{Wei2021a,
+	author = {Mingkui Wei},
+	title = {Domain Shadowing: Leveraging Content Delivery Networks for Robust Blocking-Resistant Communications},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2021},
+	url = {https://www.usenix.org/system/files/sec21-wei.pdf},
+}
+
+@inproceedings{Bock2021b,
+	author = {Kevin Bock and Abdulrahman Alaraj and Yair Fax and Kyle Hurley and Eric Wustrow and Dave Levin},
+	title = {Weaponizing Middleboxes for {TCP} Reflected Amplification},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2021},
+	url = {https://www.usenix.org/system/files/sec21-bock.pdf},
+}
+
+@inproceedings{Hoang2021a,
+	author = {Nguyen Phong Hoang and Arian Akhavan Niaki and Jakub Dalek and Jeffrey Knockel and Pellaeon Lin and Bill Marczak and Masashi Crete-Nishihata and Phillipa Gill and Michalis Polychronakis},
+	title = {How Great is the {Great Firewall}? Measuring {China}'s DNS Censorship},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2021},
+	url = {https://www.usenix.org/system/files/sec21-hoang.pdf},
+}
+
+@inproceedings{Rosen2021a,
+	author = {Marc B. Rosen and James Parker and Alex J. Malozemoff},
+	title = {{Balboa}: Bobbing and Weaving around Network Censorship},
+	booktitle = {USENIX Security Symposium},
+	publisher = {USENIX},
+	year = {2021},
+	url = {https://www.usenix.org/system/files/sec21-rosen.pdf},
+}
+
+@inproceedings{Bock2021a,
+	author = {Kevin Bock and Pranav Bharadwaj and Jasraj Singh and Dave Levin},
+	title = {Your Censor is My Censor: Weaponizing Censorship Infrastructure for Availability Attacks},
+	booktitle = {Workshop on Offensive Technologies},
+	publisher = {IEEE},
+	year = {2021},
+	url = {http://www.cs.umd.edu/~dml/papers/weaponizing_woot21.pdf},
+}
+
+@article{Gosain2021a,
+	author = {Devashish Gosain and Mayank Mohindra and Sambuddho Chakravarty},
+	title = {Too Close for Comfort: Morasses of (Anti-) Censorship in the Era of {CDN}s},
+	journal = {Privacy Enhancing Technologies},
+	volume = {2021},
+	number = {2},
+	publisher = {Sciendo},
+	year = {2021},
+	url = {https://petsymposium.org/2021/files/papers/issue2/popets-2021-0023.pdf},
+}
+
 @inproceedings{Barradas2020b,
 	author = {Diogo Barradas and Nuno Santos},
 	title = {Towards a Scalable Censorship-Resistant Overlay Network based on {WebRTC} Covert Channels},