diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 63cb027..cb3e427 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -2,7 +2,7 @@
   "image": "mcr.microsoft.com/devcontainers/universal:2",
   "features": {
     "ghcr.io/devcontainers/features/php:1": {
-      "version": "8.1",
+      "version": "8.3",
       "installComposer": true
     }
   }
diff --git a/.github/workflows/continuous_integration.yml b/.github/workflows/continuous_integration.yml
index 2cc92c2..fd863cc 100644
--- a/.github/workflows/continuous_integration.yml
+++ b/.github/workflows/continuous_integration.yml
@@ -17,7 +17,7 @@ jobs:
       - name: Setup PHP
         uses: shivammathur/setup-php@a4e22b60bbb9c1021113f2860347b0759f66fe5d
         with:
-          php-version: '8.1'
+          php-version: '8.3'
           tools: composer, infection
           coverage: pcov
 
diff --git a/Dockerfile b/Dockerfile
index 5c914d7..4a7589a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ RUN /usr/bin/composer install \
     --classmap-authoritative \
     --working-dir=/opt/representer
 
-FROM php:8.1-cli-alpine
+FROM php:8.3-cli-alpine
 
 COPY --from=builder /opt/representer /opt/representer