diff --git a/appveyor.yml b/appveyor.yml
index dfaf19a..e79bb7a 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -34,9 +34,8 @@ build_script:
   - if /I "%APPVEYOR_REPO_TAG%" EQU "true" (set DEPLOY_TAG=%APPVEYOR_REPO_TAG_NAME%) else (set DEPLOY_TAG=%APPVEYOR_REPO_COMMIT:~0,5%)
   - set DEPLOY_SUFFIX=%DEPLOY_TAG%-x86_64-windows.zip
   - 7z a "bin\dhall-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall.exe"
-  # dhall-json cannot be built with lts-6
-  - if exist "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-json.exe" ( 7z a "bin\dhall-json-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-json.exe" )
-  - if exist "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-yaml.exe" ( 7z a "bin\dhall-json-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-yaml.exe" )
+  - 7z a "bin\dhall-json-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-json.exe"
+  - 7z a "bin\dhall-json-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-yaml.exe"
   - 7z a "bin\dhall-text-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-text.exe"
   - 7z a "bin\dhall-bash-%DEPLOY_SUFFIX%" "%APPVEYOR_BUILD_FOLDER%\bin\dhall-to-bash.exe"
 
diff --git a/stack-lts-6.yaml b/stack-lts-6.yaml
index 81affc7..aff83b4 100644
--- a/stack-lts-6.yaml
+++ b/stack-lts-6.yaml
@@ -2,8 +2,7 @@ resolver: lts-6.27
 packages:
   - dhall
   - dhall-bash
-#  dhall-json uses ApplicativeDo
-#  - dhall-json
+  - dhall-json
   - dhall-text
 extra-deps:
 - ansi-terminal-0.7.1.1
diff --git a/stack.yaml b/stack.yaml
index f40422f..5aac3d6 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,4 +1,4 @@
-resolver: lts-13.3
+resolver: lts-13.5
 packages:
   - dhall
   - dhall-bash