diff --git a/Dockerfile b/Dockerfile
index eae87596..13bd7da4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ ENV HOME /home/stackage
 ENV LANG en_US.UTF-8
 
 # NOTE: also update debian-bootstrap.sh when cuda version changes
-ENV PATH /usr/local/cuda-8.0/bin:/opt/ghc/8.4.1/bin:/usr/sbin:/usr/bin:/sbin:/bin
+ENV PATH /usr/local/cuda-8.0/bin:/opt/ghc/8.4.2/bin:/usr/sbin:/usr/bin:/sbin:/bin
 ENV CUDA_PATH /usr/local/cuda-8.0
 ENV LD_LIBRARY_PATH=/usr/local/cuda-8.0/lib64:/usr/local/cuda-8.0/nvvm/lib64
 
diff --git a/check b/check
index 24bd97ad..6cca0505 100755
--- a/check
+++ b/check
@@ -3,4 +3,4 @@
 # Convenience script for checking constraints locally
 
 cd `dirname $0`
-exec stack exec --resolver ghc-8.4.1 stackage-curator check
+exec stack exec --resolver ghc-8.4.2 stackage-curator check
diff --git a/debian-bootstrap.sh b/debian-bootstrap.sh
index 29356170..efbd101a 100755
--- a/debian-bootstrap.sh
+++ b/debian-bootstrap.sh
@@ -25,7 +25,7 @@ add-apt-repository -y --keyserver hkp://keyserver.ubuntu.com:80 'deb http://down
 add-apt-repository -y --keyserver hkp://keyserver.ubuntu.com:80 'deb http://download.mono-project.com/repo/debian wheezy-apache24-compat main'
 add-apt-repository -y --keyserver hkp://keyserver.ubuntu.com:80 'deb http://download.mono-project.com/repo/debian wheezy-libjpeg62-compat main'
 
-GHCVER=8.4.1
+GHCVER=8.4.2
 
 apt-get update
 apt-get install -y \