diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 681c45acd..b7fb11786 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -31,6 +31,7 @@ jobs:
           - "8.0"
           - "8.1"
           - "8.2"
+          - "8.3"
 
         compiler:
           - default
@@ -45,6 +46,9 @@ jobs:
           - os: ubuntu-latest
             php-version: "8.2"
             compiler: jit
+          - os: ubuntu-latest
+            php-version: "8.3"
+            compiler: jit
 
     steps:
     - name: Checkout
diff --git a/CHANGELOG.md b/CHANGELOG.md
index e95ce6989..16cba1661 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+- PHP8.3 support [#925](https://github.com/smarty-php/smarty/issues/925)
+
 ### Fixed
 - The {debug} tag was broken in v5 [#922](https://github.com/smarty-php/smarty/issues/922)
 
diff --git a/docker-compose.yml b/docker-compose.yml
index 770b243a0..7ecd8b436 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -37,7 +37,11 @@ services:
       service: base
     build:
       dockerfile: ./utilities/testrunners/php82/Dockerfile
-
+  php83:
+    extends:
+      service: base
+    build:
+      dockerfile: ./utilities/testrunners/php83/Dockerfile
 volumes:
   smarty-code:
 
diff --git a/run-tests-for-all-php-versions.sh b/run-tests-for-all-php-versions.sh
index b2a4133a0..de59f3034 100755
--- a/run-tests-for-all-php-versions.sh
+++ b/run-tests-for-all-php-versions.sh
@@ -13,3 +13,4 @@ $COMPOSE_CMD run --rm php74 ./run-tests.sh $@ && \
 $COMPOSE_CMD run --rm php80 ./run-tests.sh $@ && \
 $COMPOSE_CMD run --rm php81 ./run-tests.sh $@ && \
 $COMPOSE_CMD run --rm php82 ./run-tests.sh $@
+$COMPOSE_CMD run --rm php83 ./run-tests.sh $@
diff --git a/src/ErrorHandler.php b/src/ErrorHandler.php
index 16ebbeaa4..05b1cb3e6 100644
--- a/src/ErrorHandler.php
+++ b/src/ErrorHandler.php
@@ -77,7 +77,7 @@ public function handleError($errno, $errstr, $errfile, $errline, $errcontext = [
         }
 
         if ($this->allowUndefinedArrayKeys && preg_match(
-            '/^(Undefined index|Undefined array key|Trying to access array offset on value of type)/',
+            '/^(Undefined index|Undefined array key|Trying to access array offset on)/',
             $errstr
         )) {
             return; // suppresses this error
diff --git a/utilities/testrunners/php83/Dockerfile b/utilities/testrunners/php83/Dockerfile
new file mode 100644
index 000000000..83cd8255f
--- /dev/null
+++ b/utilities/testrunners/php83/Dockerfile
@@ -0,0 +1,10 @@
+FROM php:8.3-cli
+
+## Basic utilities
+RUN apt-get update -yqq && apt-get install -y curl apt-utils git zip unzip
+
+## Composer
+COPY ./utilities/testrunners/shared/install-composer.sh /root/install-composer.sh
+WORKDIR /root
+RUN sh ./install-composer.sh
+RUN mv ./composer.phar /usr/local/bin/composer