diff --git a/workspace/Dockerfile-56 b/workspace/Dockerfile-56
index a3885523..f70fc829 100644
--- a/workspace/Dockerfile-56
+++ b/workspace/Dockerfile-56
@@ -189,6 +189,7 @@ ARG INSTALL_MONGO=false
 ENV INSTALL_MONGO ${INSTALL_MONGO}
 RUN if [ ${INSTALL_MONGO} = true ]; then \
     # Install the mongodb extension
+    pecl channel-update pecl.php.net && \
     pecl install mongodb && \
     echo "extension=mongodb.so" >> /etc/php/5.6/mods-available/mongodb.ini && \
     ln -s /etc/php/5.6/mods-available/mongodb.ini /etc/php/5.6/cli/conf.d/30-mongodb.ini \