diff --git a/Dockerfile b/Dockerfile
index ba49f0e..c6d3170 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,11 +1,11 @@
-FROM php:7.4-cli-alpine
+FROM php:8.0-cli-alpine
 
 # Install PHP CodeSniffer
-ARG PHPCS_RELEASE="3.5.3"
+ARG PHPCS_RELEASE="3.6.0"
 RUN pear install PHP_CodeSniffer-$PHPCS_RELEASE
 
 # Install the PHPCompatibility standard
-ARG PHPCOMP_RELEASE="9.3.4"
+ARG PHPCOMP_RELEASE="9.3.5"
 RUN set -eux &&\
     apk --no-cache add git &&\
     mkdir -p "/opt/" &&\
@@ -17,7 +17,7 @@ RUN set -eux &&\
 # Configure phpcs defaults
 RUN phpcs --config-set installed_paths /opt/PHPCompatibility &&\
     phpcs --config-set default_standard PHPCompatibility &&\
-    phpcs --config-set testVersion 7.4 &&\
+    phpcs --config-set testVersion 8.0 &&\
     phpcs --config-set report_width 120
 
 # Configure PHP with all the memory we might need (unlimited)
diff --git a/README.md b/README.md
index e027448..02a7def 100644
--- a/README.md
+++ b/README.md
@@ -21,14 +21,14 @@ phpco() { docker run --init -v $PWD:/mnt/src:cached --rm -u "$(id -u):$(id -g)"
 You can also add this snippet to your `.bashrc` or similar shell startup script. That way it will always be available whenever you open a new shell.
 
 ## Running phpco-docker
-Now you can directly use the tool. This command will do a full check of all your code in the current directory for PHP 7.4 compatibility.
+Now you can directly use the tool. This command will do a full check of all your code in the current directory for PHP 8.0 compatibility.
 ```
-phpco -p --colors --extensions=php --runtime-set testVersion 7.4 .
+phpco -p --colors --extensions=php --runtime-set testVersion 8.0 .
 ```
 
 As it completes you will see a list of found warnings and errors in your code. If you are getting a lot of warnings, but only want to deal with the stuff that will actually break, add `-n` to only show errors.
 
-If you have also updated all of your dependencies and are sure they support the PHP version you want to migrate to, you can exclude the `vendor` folder completely to only check your own code. Checking for PHP version 7.4 is the default so we can also remove that part.
+If you have also updated all of your dependencies and are sure they support the PHP version you want to migrate to, you can exclude the `vendor` folder completely to only check your own code. Checking for PHP version 8.0 is the default so we can also remove that part.
 
 ```
 phpco -p --colors --extensions=php . -n --ignore="vendor/"