diff --git a/CHANGELOG.md b/CHANGELOG.md
index 4a390cd..f8d9df2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 |Version|Date|Notes|
 |---|---|---|
+|4.0|2021-02-27|Add big-sur support. Use `sickcodes/docker-osx:big-sur` or build using `--build-arg VERSION=11`|
 |   |2021-02-26|Change `-e NOPICKER=true` to simply do `sed -i '/^.*InstallMedia.*/d' Launch.sh` and `export BOOTDISK=/home/arch/OSX-KVM/OpenCore-Catalina/OpenCore-nopicker.qcow2`.|
 |3.2|2021-02-25|Add a script to generate unique machine serial numbers. Add a script to generate a bootdisk from given serial numbers. Add Linux for libguestfs which allows the docker container to make QEMU bootdisks with specific serial numbers.|
 |   |2021-02-21|Add NOPICKER environment variable to ALL images.|
diff --git a/Dockerfile b/Dockerfile
index 0bac25e..8033913 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@
 # Repo:             https://github.com/sickcodes/Docker-OSX/
 # Title:            Mac on Docker (Docker-OSX)
 # Author:           Sick.Codes https://sick.codes/
-# Version:          3.2
+# Version:          4.0
 # License:          GPLv3+
 #
 # All credits for OSX-KVM and the rest at @Kholia's repo: https://github.com/kholia/osx-kvm
diff --git a/Dockerfile.auto b/Dockerfile.auto
index dc2367c..ca6e548 100644
--- a/Dockerfile.auto
+++ b/Dockerfile.auto
@@ -7,7 +7,7 @@
 # 
 # Title:            Mac on Docker (Docker-OSX) [AUTOINSTALL]
 # Author:           Sick.Codes https://twitter.com/sickcodes       
-# Version:          3.2
+# Version:          4.0
 # License:          GPLv3+
 # Repository:       https://github.com/sickcodes/Docker-OSX
 # 
diff --git a/Dockerfile.naked b/Dockerfile.naked
index 04368bc..09db8a3 100644
--- a/Dockerfile.naked
+++ b/Dockerfile.naked
@@ -7,7 +7,7 @@
 # 
 # Title:            Mac on Docker (Docker-OSX) [AUTOINSTALL]
 # Author:           Sick.Codes https://twitter.com/sickcodes       
-# Version:          3.2
+# Version:          4.0
 # License:          GPLv3+
 # Repository:       https://github.com/sickcodes/Docker-OSX
 # 
diff --git a/README.md b/README.md
index d5e8a58..3daf0ee 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,9 @@ https://github.com/sickcodes/Docker-OSX/blob/master/CREDITS.md
 
 Docker Hub: https://hub.docker.com/r/sickcodes/docker-osx
 
-- sickcodes/docker-osx:latest - base recovery image
+- sickcodes/docker-osx:latest - base recovery image (10)
+
+- sickcodes/docker-osx:big-sur - base recovery image (11)
 
 - sickcodes/docker-osx:naked - supply your own .img file
 
@@ -84,6 +86,7 @@ Use `docker commit`, copy the ID, and then `docker start ID`
 
 docker pull sickcodes/docker-osx:latest
 
+# catalina
 docker run -it \
     --device /dev/kvm \
     -p 50922:10022 \
@@ -91,6 +94,14 @@ docker run -it \
     -e "DISPLAY=${DISPLAY:-:0.0}" \
     sickcodes/docker-osx:latest
 
+# big sur
+docker run -it \
+    --device /dev/kvm \
+    -p 50922:10022 \
+    -v /tmp/.X11-unix:/tmp/.X11-unix \
+    -e "DISPLAY=${DISPLAY:-:0.0}" \
+    sickcodes/docker-osx:big-sur
+
 # Wait 2-3 minutes until you see the logo.
 
 ```
@@ -212,7 +223,8 @@ docker run -it \
     sickcodes/docker-osx:naked
 ```
 
-# Features In Docker-OSX v3.2
+# Features In Docker-OSX v4
+- `sickcodes/docker-osx:big-sur` - original base recovery image for latest OS (safe)
 - Serial number generators. [See below or ./custom](https://github.com/sickcodes/Docker-OSX/tree/master/custom)
 - Full auto mode: boot straight to OSX shell and even run commands as runtime arguments!
 - `sickcodes/docker-osx:latest` - original base recovery image (safe)