Update yarn version on Dockerfile

.circleci/config.yml

@@ -39,8 +39,6 @@ jobs:
       - attach_workspace:
           at: /home/circleci/project
 
-      - run: npm i -g [email protected] # because docker image uses 1.13.0
-
       - run: yarn run patch-package
 
       - run: "cd packages/cf-funding-protocol-contracts && yarn run ensure-build-artifacts-match-solidity-code"
@@ -55,7 +53,7 @@ jobs:
       - <<: *save_code
 
       - <<: *restore_dep
-      - run: npm i -g [email protected] # because docker image uses 1.13.0
+
       - run:
           name: "yarn --frozen-lockfile"
           command: yarn --frozen-lockfile
@@ -109,8 +107,6 @@ jobs:
       - attach_workspace:
           at: /home/circleci/project
 
-      - run: npm i -g [email protected] # because docker image uses 1.13.0
-
       - run: yarn lint
 
   ensure-updated-lockfiles:
@@ -125,7 +121,7 @@ jobs:
 
       - run: apt-get install -y jq # using this to mutate package.json
 
-      - run: npm i -g [email protected] # because docker image uses 1.13.0
+
 
       - run:
           name: Check root yarn.lock
@@ -141,8 +137,6 @@ jobs:
       - attach_workspace:
           at: /home/circleci/project
 
-      - run: npm i -g [email protected] # because docker image uses 1.13.0
-
       - run: yarn --frozen-lockfile # symlink packages' node_modules
 
       - run:

.circleci/images/build/Dockerfile

@@ -14,5 +14,5 @@ RUN apt-get install -y curl && \
     curl -sL https://deb.nodesource.com/node_10.x/pool/main/n/nodejs/nodejs_10.15.3-1nodesource1_amd64.deb > nodejs-10.15.3.deb && \
     dpkg -i nodejs-10.15.3.deb && \
     rm /usr/local/bin/node && \
-    npm install -g yarn@1.12.3 && \
+    npm install -g yarn@1.17.3 && \
     rm /usr/local/bin/yarn