diff --git a/.travis.yml b/.travis.yml
index 2eb8f375..79651dee 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -57,15 +57,11 @@ matrix:
     compiler: ": #stack default"
     addons: {apt: {packages: [libgmp-dev]}}
 
-  - env: BUILD=stack ARGS="--resolver lts-7"
-    compiler: ": #stack 8.0.1"
-    addons: {apt: {packages: [libgmp-dev]}}
-
-  - env: BUILD=stack ARGS="--resolver lts-9"
+  - env: BUILD=stack ARGS="--stack-yaml stack-lts-9.yaml --resolver lts-9"
     compiler: ": #stack 8.0.2"
     addons: {apt: {packages: [libgmp-dev]}}
 
-  - env: BUILD=stack ARGS="--resolver lts-11"
+  - env: BUILD=stack ARGS="--stack-yaml stack-lts-11.yaml --resolver lts-11"
     compiler: ": #stack 8.2.2"
     addons: {apt: {packages: [libgmp-dev]}}
 
@@ -79,16 +75,11 @@ matrix:
     compiler: ": #stack default osx"
     os: osx
 
-  # malformed mach-o: load commands size (34184) > 32768)
-  #- env: BUILD=stack ARGS="--resolver lts-7"
-  #  compiler: ": #stack 8.0.1 osx"
-  #  os: osx
-
-  - env: BUILD=stack ARGS="--resolver lts-9"
+  - env: BUILD=stack ARGS="--stack-yaml stack-lts-9.yaml --resolver lts-9"
     compiler: ": #stack 8.0.2 osx"
     os: osx
 
-  - env: BUILD=stack ARGS="--resolver lts-11"
+  - env: BUILD=stack ARGS="--stack-yaml stack-lts-11.yaml --resolver lts-11"
     compiler: ": #stack 8.2.2 osx"
     os: osx
 
diff --git a/stack-lts-11.yaml b/stack-lts-11.yaml
new file mode 120000
index 00000000..2df91e0c
--- /dev/null
+++ b/stack-lts-11.yaml
@@ -0,0 +1 @@
+stack.yaml
\ No newline at end of file
diff --git a/stack-lts-9.yaml b/stack-lts-9.yaml
new file mode 100644
index 00000000..01b08a00
--- /dev/null
+++ b/stack-lts-9.yaml
@@ -0,0 +1,32 @@
+resolver: lts-9.21
+packages:
+- ./yesod-core
+- ./yesod-static
+- ./yesod-persistent
+- ./yesod-newsfeed
+- ./yesod-form
+- ./yesod-auth
+- ./yesod-auth-oauth
+- ./yesod-sitemap
+- ./yesod-test
+- ./yesod-bin
+- ./yesod
+- ./yesod-eventsource
+- ./yesod-websockets
+extra-deps:
+- conduit-1.3.0.2@rev:0
+- conduit-extra-1.3.0@rev:0
+- html-conduit-1.3.0@rev:0
+- http-client-0.5.12.1@rev:0
+- http-conduit-2.3.1@rev:0
+- monad-logger-0.3.28.5@rev:0
+- mono-traversable-1.0.8.1@rev:0
+- persistent-2.8.2@rev:0
+- project-template-0.2.0.1@rev:0
+- resourcet-1.2.1@rev:0
+- streaming-commons-0.2.0.0@rev:0
+- typed-process-0.2.2.0@rev:0
+- wai-extra-3.0.22.1@rev:0
+- wai-logger-2.3.2@rev:0
+- xml-conduit-1.8.0@rev:0
+- yaml-0.8.30@rev:0
diff --git a/stack.yaml b/stack.yaml
index 52ec0356..5789bb4b 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,46 +1,15 @@
-resolver: lts-8.12
+resolver: lts-11.10
 packages:
-  - ./yesod-core
-  - ./yesod-static
-  - ./yesod-persistent
-  - ./yesod-newsfeed
-  - ./yesod-form
-  - ./yesod-auth
-  - ./yesod-auth-oauth
-  - ./yesod-sitemap
-  - ./yesod-test
-  - ./yesod-bin
-  - ./yesod
-  - ./yesod-eventsource
-  - ./yesod-websockets
-extra-deps:
-- unliftio-core-0.1.1.0
-- unliftio-0.2.4.0
-- authenticate-1.3.4
-- typed-process-0.2.1.0
-- conduit-1.3.0
-- conduit-extra-1.3.0
-- persistent-2.8.0
-- resourcet-1.2.0
-- mono-traversable-1.0.8.1
-- yaml-0.8.28
-- project-template-0.2.0.1
-- xml-conduit-1.8.0
-- wai-extra-3.0.22.0
-- monad-logger-0.3.28.1
-- html-conduit-1.3.0
-- http-conduit-2.3.0
-- persistent-sqlite-2.8.0
-- cookie-0.4.3
-- gauge-0.2.1
-- basement-0.0.6
-- foundation-0.0.19
-- memory-0.14.14
-- simple-sendfile-0.2.27
-- aeson-1.2.4.0
-- http-client-0.5.10
-- http-client-tls-0.3.5.2
-- websockets-0.12.3.1
-- th-abstraction-0.2.6.0
-- persistent-template-2.5.3.1
-- th-lift-instances-0.1.11
+- ./yesod-core
+- ./yesod-static
+- ./yesod-persistent
+- ./yesod-newsfeed
+- ./yesod-form
+- ./yesod-auth
+- ./yesod-auth-oauth
+- ./yesod-sitemap
+- ./yesod-test
+- ./yesod-bin
+- ./yesod
+- ./yesod-eventsource
+- ./yesod-websockets