diff --git a/.circleci/config.yml b/.circleci/config.yml
deleted file mode 100644
index f0a68d8b..00000000
--- a/.circleci/config.yml
+++ /dev/null
@@ -1,59 +0,0 @@
-version: 2
-
-jobs:
-  build:
-    environment:
-      XCODE_SCHEME: test
-      XCODE_WORKSPACE: test
-      XCODE_PROJECT: test
-      NODE_VERSION: '10.2.1'
-    macos:
-      xcode: 8.3.3
-    steps:
-    - checkout
-    - run:
-        name: Update submodules
-        command: git submodule update --init
-    - restore_cache:
-        key: node-{{ .Environment.NODE_VERSION }}
-    - restore_cache:
-        key: emsdk-{{ checksum "script/install-emscripten.sh" }}
-    - run:
-        name: Install Node.js with nvm
-        command: |
-          export NVM_DIR=${HOME}/.nvm
-          curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.8/install.sh | bash
-          [ -s "${NVM_DIR}/nvm.sh" ] && \. "${NVM_DIR}/nvm.sh"
-          nvm install ${NODE_VERSION}
-          nvm alias default ${NODE_VERSION}
-          echo "[ -s \"${NVM_DIR}/nvm.sh\" ] && . \"${NVM_DIR}/nvm.sh\"" >> $BASH_ENV
-    - run:
-        name: Install node dependencies
-        command: npm install
-    - run:
-        name: Build with emscripten
-        command: script/install-emscripten.sh
-    - save_cache:
-        key: node-{{ .Environment.NODE_VERSION }}
-        paths:
-        - .nvm
-    - save_cache:
-        key: emsdk-{{ checksum "script/install-emscripten.sh" }}
-        paths:
-        - .emscripten_cache
-        - emsdk-portable
-    - run:
-        name: Build emscripten
-        command: npm run build:browser
-    - run:
-        name: Lint JavaScript
-        command: npm run standard
-    - run:
-        name: Test Browser
-        command: npm run test:browser
-    - run:
-        name: Test Node.js
-        command: npm run test:node
-    - run:
-        name: Test native
-        command: npm run test:native
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 00000000..eb165d32
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,39 @@
+name: Build
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: macos-10.15
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js
+      uses: actions/setup-node@v1
+      with:
+        node-version: '10.x'
+
+    - name: checkout
+      run: git submodule update --init
+        
+    - name: Install node dependencies
+      run: npm install
+
+    - name: Build with emscripten
+      run: script/install-emscripten.sh
+
+    - name: Build emscripten
+      run: npm run build:browser
+
+    - name: Lint JavaScript
+      run: npm run standard
+
+    - name: Test Browser
+      run: npm run test:browser
+
+    - name: Test Node.js
+      run: npm run test:node
+
+    - name: Test native
+      run: npm run test:native
+
diff --git a/.gitignore b/.gitignore
index 51f142db..6887cce9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,5 +4,6 @@ build
 .clang_complete
 
 /browser.js
-emsdk-portable
+emsdk-1.39.16
 package-lock.json
+browser.wasm
\ No newline at end of file
diff --git a/script/build-browser-version.sh b/script/build-browser-version.sh
index bb370e11..64f3011a 100755
--- a/script/build-browser-version.sh
+++ b/script/build-browser-version.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-source emsdk-portable/emsdk_env.sh
+source emsdk-1.39.16/emsdk_env.sh
 
 mkdir -p build
 
diff --git a/script/install-emscripten.sh b/script/install-emscripten.sh
index 952cbcd4..d22ab23c 100755
--- a/script/install-emscripten.sh
+++ b/script/install-emscripten.sh
@@ -2,8 +2,8 @@
 
 set -e
 
-EMSCRIPTEN_DOWNLOAD_URL='https://s3.amazonaws.com/mozilla-games/emscripten/releases/emsdk-portable.tar.gz'
-EMSDK_PATH="./emsdk-portable/emsdk"
+EMSCRIPTEN_DOWNLOAD_URL='https://codeload.github.com/emscripten-core/emsdk/tar.gz/1.39.16'
+EMSDK_PATH="./emsdk-1.39.16/emsdk"
 
 if [ ! -f $EMSDK_PATH ]; then
   echo 'Downloading emscripten SDK installer...'
@@ -13,10 +13,10 @@ fi
 echo 'Installing emscripten SDK...'
 
 # Workaround https://github.com/juj/emsdk/pull/74
-sed -i{} "s_/kripken/emscripten/'_/kripken/emscripten'_" $EMSDK_PATH
-sed -i{} "s_/WebAssembly/binaryen/'_/WebAssembly/binaryen'_" $EMSDK_PATH
+#sed -i{} "s_/kripken/emscripten/'_/kripken/emscripten'_" $EMSDK_PATH
+#sed -i{} "s_/WebAssembly/binaryen/'_/WebAssembly/binaryen'_" $EMSDK_PATH
 
 $EMSDK_PATH update
-$EMSDK_PATH list
-$EMSDK_PATH install sdk-1.37.9-64bit
-$EMSDK_PATH activate sdk-1.37.9-64bit
+$EMSDK_PATH list --old
+$EMSDK_PATH install emscripten-1.37.9
+$EMSDK_PATH activate emscripten-1.37.9