diff --git a/bootstrap.sh b/bootstrap.sh
index 1fbf98ce0..b148139bd 100755
--- a/bootstrap.sh
+++ b/bootstrap.sh
@@ -48,23 +48,25 @@ function install() {
     fi
 }
 
+ICU_VERSION="55.1"
+
 function install_mason_deps() {
     install gdal 1.11.2 libgdal &
     install boost 1.59.0 &
     install boost_liball 1.59.0 &
-    install freetype 2.5.5 libfreetype &
+    install freetype 2.6 libfreetype &
     install harfbuzz 0.9.40 libharfbuzz &
     install jpeg_turbo 1.4.0 libjpeg &
     install libpng 1.6.17 libpng &
     install webp 0.4.2 libwebp &
-    install icu 54.1 &
+    install icu ${ICU_VERSION} &
     install proj 4.8.0 libproj &
     install libtiff 4.0.4beta libtiff &
     install libpq 9.4.0 &
     install sqlite 3.8.8.1 libsqlite3 &
     install expat 2.1.0 libexpat &
     install pixman 0.32.6 libpixman-1 &
-    install cairo 1.12.18 libcairo &
+    install cairo 1.14.2 libcairo &
     install protobuf 2.6.1 &
     wait
     # technically protobuf is not a mapnik core dep, but installing
@@ -131,7 +133,7 @@ SAMPLE_INPUT_PLUGINS = True
 # NOTE: the `mapnik-settings.env` is used by test/run (which is run by `make test`)
 function setup_runtime_settings() {
     echo "export PROJ_LIB=${MASON_LINKED_ABS}/share/proj" > mapnik-settings.env
-    echo "export ICU_DATA=${MASON_LINKED_ABS}/share/icu/54.1" >> mapnik-settings.env
+    echo "export ICU_DATA=${MASON_LINKED_ABS}/share/icu/${ICU_VERSION}" >> mapnik-settings.env
     echo "export GDAL_DATA=${MASON_LINKED_ABS}/share/gdal" >> mapnik-settings.env
     source mapnik-settings.env
 }