diff --git a/Dockerfile.ubuntu-32 b/Dockerfile.ubuntu-32
index 1d15504..c457531 100644
--- a/Dockerfile.ubuntu-32
+++ b/Dockerfile.ubuntu-32
@@ -8,7 +8,9 @@ RUN apt-get update && \
     apt-get -y install wget && \
     cd /root && \
     wget -O- 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x1E9377A2BA9EF27F' | apt-key add - && \
+    wget -O- 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x8E51A6D660CD88D67D65221D90BD7EACED8E640A' | apt-key add - && \
     echo 'deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu trusty main' >> /etc/apt/sources.list && \
+    echo 'deb http://ppa.launchpad.net/mc3man/trusty-media/ubuntu trusty main' >> /etc/apt/sources.list && \
     apt-get update && \
     apt-get install -y gcc-8 g++-8 libudev-dev libx11-dev libxcursor-dev libxrandr-dev libasound2-dev libpulse-dev \
             libfreetype6-dev libgl1-mesa-dev libglu1-mesa-dev libxi-dev libxinerama-dev git scons cmake perl make bzip2 yasm && \
diff --git a/Dockerfile.ubuntu-64 b/Dockerfile.ubuntu-64
index 9dcf06c..5fad2dc 100644
--- a/Dockerfile.ubuntu-64
+++ b/Dockerfile.ubuntu-64
@@ -8,7 +8,9 @@ RUN apt-get update && \
     apt-get -y install wget && \
     cd /root && \
     wget -O- 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x1E9377A2BA9EF27F' | apt-key add - && \
+    wget -O- 'https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x8E51A6D660CD88D67D65221D90BD7EACED8E640A' | apt-key add - && \
     echo 'deb http://ppa.launchpad.net/ubuntu-toolchain-r/test/ubuntu trusty main' >> /etc/apt/sources.list && \
+    echo 'deb http://ppa.launchpad.net/mc3man/trusty-media/ubuntu trusty main' >> /etc/apt/sources.list && \
     apt-get update && \
     apt-get install -y gcc-8 g++-8 libudev-dev libx11-dev libxcursor-dev libxrandr-dev libasound2-dev libpulse-dev \
             libfreetype6-dev libgl1-mesa-dev libglu1-mesa-dev libxi-dev libxinerama-dev git scons cmake perl make bzip2 yasm && \