diff --git a/oscript/Dockerfile b/oscript/Dockerfile
index 7e6067a..556fe47 100644
--- a/oscript/Dockerfile
+++ b/oscript/Dockerfile
@@ -13,6 +13,8 @@ RUN apt-get update \
       gnupg \
       dirmngr \
       wget \
+      libicu-dev \
+      pkg-config \
   && apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF \
   && echo "deb http://download.mono-project.com/repo/debian stable-buster main" > /etc/apt/sources.list.d/mono-official-stable.list \
   && apt-get update \