diff --git a/php-worker/Dockerfile b/php-worker/Dockerfile
index df78ab42..d9733e5f 100644
--- a/php-worker/Dockerfile
+++ b/php-worker/Dockerfile
@@ -29,6 +29,7 @@ RUN apk --update add wget \
   autoconf \
   cyrus-sasl-dev \
   libgsasl-dev \
+  oniguruma-dev \
   supervisor
 
 RUN docker-php-ext-install mysqli mbstring pdo pdo_mysql tokenizer xml pcntl