diff --git a/linux-build-farm/fedora-22/x64/Dockerfile b/linux-build-farm/fedora-22/x64/Dockerfile
index 6874355c5..6da0a9213 100644
--- a/linux-build-farm/fedora-22/x64/Dockerfile
+++ b/linux-build-farm/fedora-22/x64/Dockerfile
@@ -5,5 +5,6 @@ RUN yum update -y
 RUN yum install -y make rpmdevtools gcc-c++ rubygem-ronn json-parser-devel lz4-devel http-parser-devel libnatpmp-devel
 
 RUN rpm --erase http-parser-devel
+RUN yum install -y rubygem-ronn ruby
 
 ADD zt1-src.tar.gz /
diff --git a/linux-build-farm/fedora-22/x86/Dockerfile b/linux-build-farm/fedora-22/x86/Dockerfile
index cb264482e..3c24b844b 100644
--- a/linux-build-farm/fedora-22/x86/Dockerfile
+++ b/linux-build-farm/fedora-22/x86/Dockerfile
@@ -14,5 +14,6 @@ MAINTAINER Adam Ierymenko <adam.ierymenko@zerotier.com>
 RUN echo 'i686-redhat-linux' >/etc/rpm/platform
 
 RUN rpm --erase http-parser-devel
+RUN yum install -y rubygem-ronn ruby
 
 ADD zt1-src.tar.gz /