diff --git a/Dockerfile b/Dockerfile
index d379666..8e4120b 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,6 +15,11 @@ RUN apt-get install -y ruby clang gcc make ruby-dev libffi-dev
 
 RUN gem install compass --no-document
 
+# install php igbinary extension via PECL
+#RUN pecl install igbinary && docker-php-ext-enable igbinary
+RUN apt-get install -y --no-install-recommends \
+		php8.1-igbinary
+
 RUN apt-get -y purge clang gcc make ruby-dev libffi-dev \
     && apt-get --purge -y autoremove \
 	&& apt-get autoclean \