add libicu to CI

1 files changed, 1 insertions, 1 deletions

diff --git a/Dockerfile b/Dockerfile
index 61b5c71..e178814 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -23,7 +23,7 @@ LABEL maintainer="Samer Abdel-Hafez <sam@arahant.net>"
 
 # set up dependencies for the build process
 RUN apt-get -yq update && \
-    apt-get -yq install ruby2.3 ruby2.3-dev libsqlite3-dev libssl-dev pkg-config make cmake libssh2-1-dev git g++ libffi-dev ruby-bundler
+    apt-get -yq install ruby2.3 ruby2.3-dev libsqlite3-dev libssl-dev pkg-config make cmake libssh2-1-dev git g++ libffi-dev ruby-bundler libicu-dev
 
 # upgrade libssh2 to self-built backport from stage 1
 COPY --from=libssh2-backport \