diff --git a/CHANGES.md b/CHANGES.md
index 2cd3427..b36ffb7 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,6 +2,8 @@
 
 ## Unreleased
 
+* base: Pmac module version update. by @guirodrigueslima
+
 ## v0.8.0
 
 A new container image, `ghcr.io/cnpem/opcua-epics-ioc`, is now available.
diff --git a/base/.env b/base/.env
index d1de4d0..7def46e 100644
--- a/base/.env
+++ b/base/.env
@@ -22,6 +22,6 @@ NDSSCPIMEGA_VERSION=1.0.0
 LIBSSCPIMEGA_VERSION=fb8acf533a7c01b5266bf32d60d1a5f923e19523
 
 MOTOR_VERSION=R7-3-1
-PMAC_VERSION=2-6-1
+PMAC_VERSION=2-6-4b3
 
 OPCUA_VERSION=0.9.4