diff --git a/Dockerfile b/Dockerfile
index 4cf3f43..6a18d65 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -30,6 +30,7 @@ RUN apt-get update && \
       intl \
       mbstring \
       mysqli \
+      pcntl \
       pdo \
       pdo_mysql \
       zip  && \