diff --git a/Dockerfile b/Dockerfile
index 4d32c61..f026b56 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,6 +11,9 @@ RUN pecl install redis-5.3.4 \
 RUN pecl install xdebug-3.0.4 \
     && docker-php-ext-enable xdebug
 
+RUN pecl install runkit7-4.0.0a3 \
+    && docker-php-ext-enable runkit7
+
 RUN docker-php-ext-install -j$(nproc) \
     dba \
     exif \