diff --git a/.circleci/config.yml b/.circleci/config.yml
index 1f16446..c674ff5 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -4,25 +4,15 @@
 #
 version: 2
 jobs:
-  build-test-and-publish:
+  publish:
     docker:
       - image: fpco/stack-build-small:lts
-      - image: postgres:11-alpine
-        environment:
-          POSTGRES_DB: postgres_ws_test
-          POSTGRES_USER: root
     steps:
-      - checkout
-      - restore_cache:
-          name: Restore Cached Dependencies
-          keys:
-            - postgres-websockets-v1-{{ checksum "postgres-websockets.cabal" }}
+      - attach_workspace:
+          at: ws
       - run:
           name: Install curl
           command: apt-get update && apt-get -qq -y install curl libpq-dev
-      - run:
-          name: Download and run hlint
-          command: curl -sSL https://raw.github.com/ndmitchell/hlint/master/misc/run.sh | sh -s .
       - run:
           name: Download ghr
           command: |
@@ -30,9 +20,39 @@ jobs:
             curl -sSLO https://github.com/tcnksm/ghr/releases/download/v0.12.0/v0.12.0_SHASUMS
             sha256sum --check --ignore-missing v0.12.0_SHASUMS
             tar --strip-components=1 -zxvf ghr_v0.12.0_linux_386.tar.gz ghr_v0.12.0_linux_386/ghr
+      - run:
+          name: Publish Release on GitHub
+          command: |
+            mkdir result
+            cp ws/postgres-websockets.sha256 ws/postgres-websockets ./result/
+            VERSION=$(awk '/^version: / { print $2 };' < ws/postgres-websockets.cabal)
+            ./ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${VERSION} ./result/
+
+  build-test:
+    docker:
+      - image: fpco/stack-build:lts-13.14
+      - image: postgres:11-alpine
+        environment:
+          POSTGRES_DB: postgres_ws_test
+          POSTGRES_USER: root
+    steps:
+      - checkout
+      - restore_cache:
+          name: Restore Cached Dependencies
+          keys:
+            - postgres-websockets-v2-{{ checksum "stack.yaml" }}
       - run:
           name: Resolve and update dependencies
           command: stack setup
+      - run:
+          name: Install Cabal and hlint
+          command: stack install --system-ghc --resolver=lts-13.14 Cabal hlint
+      - save_cache:
+          name: Cache Dependencies
+          key: postgres-websockets-v2-{{ checksum "stack.yaml" }}
+          paths:
+            - ".stack"
+            - ".stack-work"
       - run:
           name: Build the dependencies and the library
           command: stack --silent build
@@ -44,28 +64,31 @@ jobs:
           command: stack --silent install
       - run:
           name: Calculate and save checksum
-          command: sha256sum ~/.local/bin/postgres-websockets > /root/postgres-websockets.sha256
+          command: sha256sum ~/.local/bin/postgres-websockets > ~/.local/bin/postgres-websockets.sha256
+      - run:
+          name: Save cabal file to preserve version
+          command: cp postgres-websockets.cabal ~/.local/bin/
       - save_cache:
           name: Cache Dependencies
-          key: postgres-websockets-v1-{{ checksum "postgres-websockets.cabal" }}
+          key: postgres-websockets-v2-{{ checksum "stack.yaml" }}
           paths:
             - ".stack"
             - ".stack-work"
-      - run:
-          name: Publish Release on GitHub
-          command: |
-            mkdir /root/result/
-            cp /root/postgres-websockets.sha256 /root/.local/bin/postgres-websockets /root/result/
-            VERSION=$(awk '/^version: / { print $2 };' < postgres-websockets.cabal)
-            ./ghr -t ${GITHUB_TOKEN} -u ${CIRCLE_PROJECT_USERNAME} -r ${CIRCLE_PROJECT_REPONAME} -c ${CIRCLE_SHA1} -delete ${VERSION} /root/result/
+      - persist_to_workspace:
+          root: ~/.local/bin/
+          paths: 
+            - "postgres-websockets"
+            - "postgres-websockets.sha256"
+            - "postgres-websockets.cabal"
 
 workflows:
   version: 2
   main:
     jobs:
-      - build-test-and-publish:
+      - build-test
+      - publish:
+          requires:
+            - build-test
           filters:
             branches:
               only: master
-            tags:
-              only: /^[\d.]+$/
diff --git a/postgres-websockets.cabal b/postgres-websockets.cabal
index 9c3e2fa..a19ae87 100644
--- a/postgres-websockets.cabal
+++ b/postgres-websockets.cabal
@@ -36,10 +36,9 @@ library
                      , postgresql-libpq >= 0.9 && < 1.0
                      , aeson >= 0.11
                      , protolude >= 0.2
-                     , jwt >= 0.7.2 && < 0.8
                      , hasql >= 0.19
                      , either
-                     , stm-containers == 0.2.16
+                     , stm-containers
                      , stm
                      , retry
                      , stringsearch
diff --git a/src/PostgresWebsockets/Broadcast.hs b/src/PostgresWebsockets/Broadcast.hs
index 43144d9..7477265 100644
--- a/src/PostgresWebsockets/Broadcast.hs
+++ b/src/PostgresWebsockets/Broadcast.hs
@@ -18,7 +18,7 @@ module PostgresWebsockets.Broadcast ( Multiplexer (src)
                              ) where
 
 import Protolude
-import qualified STMContainers.Map as M
+import qualified StmContainers.Map as M
 import Control.Concurrent.STM.TChan
 import Control.Concurrent.STM.TQueue
 
diff --git a/stack.yaml b/stack.yaml
index 19cf054..b77eda9 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -1,6 +1,9 @@
-resolver: lts-12.14
+resolver: lts-13.14
 extra-deps:
-- envparse-0.4.1@sha256:989902e6368532548f61de1fa245ad2b39176cddd8743b20071af519a709ce30 
+- envparse-0.4.1@sha256:989902e6368532548f61de1fa245ad2b39176cddd8743b20071af519a709ce30
+- stm-containers-1.1.0.2@sha256:8976df591e61f378ef29dc0443dbe2d5d34818c898093af3ca138ea1d013b5eb
+- stm-hamt-1.2.0.2@sha256:18126db7bf2d9c967a6020c677b3005dd957a4c39d69aeaea3c29c90de8f6124
+- primitive-extras-0.7.1@sha256:23905c57089418b1a2d324cfee3e81bbd5a344a0fa56a827867b2dce275fdb5e
 
 ghc-options:
-  postgres-websockets: -O2 -Wall -fwarn-identities -fno-warn-redundant-constraints
+  postgres-websockets: -Wall -fwarn-identities -fno-warn-redundant-constraints