diff --git a/README.md b/README.md
index e4807b9..6a8eb41 100644
--- a/README.md
+++ b/README.md
@@ -158,7 +158,7 @@ A curated list of awesome malware analysis tools and resources. Inspired by
   Rulesets and more.
 * [STIX - Structured Threat Information eXpression](http://stixproject.github.io) -
   Standardized language to represent and share cyber threat information.
-  Related efforts from [MITRE](http://www.mitre.org/):
+  Related efforts from [MITRE](https://www.mitre.org/):
   - [CAPEC - Common Attack Pattern Enumeration and Classification](http://capec.mitre.org/)
   - [CybOX - Cyber Observables eXpression](http://cyboxproject.github.io)
   - [MAEC - Malware Attribute Enumeration and Characterization](http://maec.mitre.org/)
@@ -327,7 +327,7 @@ the [browser malware](#browser-malware) section.*
   and OpenXML documents and extracting useful information.
 * [Origami PDF](https://code.google.com/archive/p/origami-pdf) - A tool for
   analyzing malicious PDFs, and more.
-* [PDF Tools](http://blog.didierstevens.com/programs/pdf-tools/) - pdfid,
+* [PDF Tools](https://blog.didierstevens.com/programs/pdf-tools/) - pdfid,
   pdf-parser, and more from Didier Stevens.
 * [PDF X-Ray Lite](https://github.com/9b/pdfxray_lite) - A PDF analysis tool,
   the backend-free version of PDF X-RAY.
@@ -373,7 +373,7 @@ the [browser malware](#browser-malware) section.*
   Reverse engineering tool for virtualization wrappers.
 * [XORBruteForcer](http://eternal-todo.com/var/scripts/xorbruteforcer) -
   A Python script for brute forcing single-byte XOR keys.
-* [XORSearch & XORStrings](http://blog.didierstevens.com/programs/xorsearch/) -
+* [XORSearch & XORStrings](https://blog.didierstevens.com/programs/xorsearch/) -
   A couple programs from Didier Stevens for finding XORed data.
 * [xortool](https://github.com/hellman/xortool) - Guess XOR key length, as
   well as the key itself.