diff --git a/README.md b/README.md
index 76953de..b88b81c 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,8 @@
 # pytket-pecos
 
 This package enables emulation of [pytket](https://github.com/CQCL/tket)
-circuits using the [PECOS](https://github.com/CQCL/PECOS) emulator.
+circuits using the
+[PECOS](https://github.com/PECOS-packages/PECOS/tree/development) emulator.
 
 ## Installation