diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 00000000..529a2680
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,51 @@
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+
+  build:
+    strategy:
+      matrix:
+        lua_ver: ['5.1']
+        numbers: ['float']
+        include:
+          - lua_ver: '5.1'
+            numbers: 'integral'
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          submodules: recursive
+      - name: Prepare cache key
+        run: git rev-parse HEAD:sdk/esp32-esp-idf > idf.rev
+        shell: bash
+      - name: Cache Espressif tools
+        uses: actions/cache@v2
+        with:
+          path: ~/.espressif
+          key: ${{ runner.os }}-espressif-tools-${{ hashFiles('idf.rev') }}
+      - name: Install dependencies
+        run: ./install.sh
+        shell: bash
+      - name: Build firmware (Lua 5.1)
+        if: ${{ matrix.lua_ver == '5.1' && matrix.numbers == 'float' }}
+        run: |
+          cp sdkconfig.defaults sdkconfig
+          make SHELL=/bin/bash
+        shell: bash
+      - name: Build firmware (Lua 5.1, integer-only)
+        if: ${{ matrix.lua_ver == '5.1' && matrix.numbers == 'integral' }}
+        run: |
+          cp sdkconfig.defaults sdkconfig
+          echo CONFIG_LUA_NUMBER_INTEGRAL=y >> sdkconfig
+          make SHELL=/bin/bash
+        shell: bash
+      - name: Upload luac.cross
+        uses: actions/upload-artifact@v2
+        if: ${{ success() }}
+        with:
+          name: luac.cross-${{ matrix.lua_ver }}-${{ matrix.numbers }}
+          path: build/luac_cross/luac.cross
diff --git a/.travis.yml b/.travis.yml
deleted file mode 100644
index 55bb5c3a..00000000
--- a/.travis.yml
+++ /dev/null
@@ -1,21 +0,0 @@
-dist: xenial
-language: cpp
-addons:
-  apt:
-    packages:
-    - python-serial
-    - gperf
-# note that we clobber $PATH completely, to get rid of /opt/python* stuff so
-# we can use the system python and python-serial, rather than messing around
-# with pip all over the place
-install:
-  - export PATH=/bin:/usr/bin:/sbin:/usr/sbin
-  - ./install.sh
-script:
-- export BUILD_DATE=$(date +%Y%m%d)
-- cp sdkconfig.defaults sdkconfig
-- make IDFPY_ARGS="-B build/float"
-- echo CONFIG_LUA_NUMBER_INTEGRAL=y >> sdkconfig
-- make IDFPY_ARGS="-B build/integer"
-# http://docs.travis-ci.com/user/environment-variables/#Convenience-Variables
-#- if [ "$TRAVIS_PULL_REQUEST" != "false" ]; then bash "$TRAVIS_BUILD_DIR"/tools/pr-build.sh; fi