diff --git a/README.md b/README.md
index 21b913b35..6e38cc511 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,10 @@
 # PCAS - Portable Channel Access Server
 
-Portable Channel Access Server and Generic Data Descriptor C++ libraries, 
-split off [EPICS Base 3.16.1](http://www.aps.anl.gov/epics/base/R3-16/1.php) 
-as a separate module for EPICS 7.
+[EPICS](https://epics-controls.org/) Portable Channel Access Server
+and Generic Data Descriptor C++ libraries, split off from
+[EPICS Base 3.16.1](https://epics-controls.org/resources-and-support/base/series-3-16/3-16-1/)
+as a separate module for
+[EPICS 7](https://epics-controls.org/resources-and-support/base/epics-7/).
 
 The repository keeps the complete history of the code, i.e. it is a clone 
 of the EPICS Base repository, which explains its size.
@@ -20,5 +22,5 @@ manually export the CA client library header file `net_convert.h`:
     cp <EPICS_BASE>/src/ca/client/net_convert.h <EPICS_BASE>/include/
 
 Additional information and documentation:
-* [Base 3.16.1 home page](http://www.aps.anl.gov/epics/base/R3-16/1.php)
-* [CA Reference Manual](http://www.aps.anl.gov/epics/base/R3-16/1-docs/CAref.html)
+* [Base 3.16.1 home page](https://epics-controls.org/resources-and-support/base/series-3-16/3-16-1/)
+* [CA 4.13.1 Reference Manual](https://epics.anl.gov/base/R7-0/1-docs/CAref.html)