diff --git a/CHANGELOG b/CHANGELOG
index 01faf44c2..61b221bc9 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,9 +2,22 @@
 List of major changes and improvements between releases
 =======================================================
 
-Yosys 0.65 .. Yosys 0.66-dev
+Yosys 0.66 .. Yosys 0.67-dev
 --------------------------
 
+Yosys 0.65 .. Yosys 0.66
+--------------------------
+ * Various
+    - C++ compiler with C++20 support is required.
+    - Please be aware that next release will also
+      migrate to CMake build system.
+ 
+ * New commands and options
+    - Added "lattice_dsp_nexus" pass for Lattice Nexus
+      DSP inference.
+    - Added "-scopename" option to "synth_gatemate" pass
+      that is propagated to "flatten".
+
 Yosys 0.64 .. Yosys 0.65
 --------------------------
  * New commands and options
diff --git a/Makefile b/Makefile
index 6ee34070d..8bb1c0b2a 100644
--- a/Makefile
+++ b/Makefile
@@ -161,7 +161,7 @@ ifeq ($(OS), Haiku)
 CXXFLAGS += -D_DEFAULT_SOURCE
 endif
 
-YOSYS_VER := 0.65
+YOSYS_VER := 0.66
 
 ifneq (, $(shell command -v git 2>/dev/null))
 ifneq (, $(shell git rev-parse --git-dir 2>/dev/null))
diff --git a/docs/source/conf.py b/docs/source/conf.py
index b85c391db..92975d3df 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -6,7 +6,7 @@ import os
 project = 'YosysHQ Yosys'
 author = 'YosysHQ GmbH'
 copyright ='2026 YosysHQ GmbH'
-yosys_ver = "0.65"
+yosys_ver = "0.66"
 
 # select HTML theme
 html_theme = 'furo-ys'