diff --git a/.bazelrc b/.bazelrc
index c2907ea7a..666114167 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -5,7 +5,7 @@ common:ci --color=no
 test:ci --test_output=errors
 
 build --disk_cache=.bazel-cache/bazel-disk
-build --repository_cache=tmp/bazel-repo
+build --repository_cache=.bazel-cache/bazel-repo
 build --color=yes
 build --jobs=8
 build --compilation_mode=fastbuild
diff --git a/.github/workflows/bazel.yml b/.github/workflows/bazel.yml
new file mode 100644
index 000000000..0c74e8985
--- /dev/null
+++ b/.github/workflows/bazel.yml
@@ -0,0 +1,44 @@
+name: Bazel CI
+
+on:
+  # Trigger the workflow on push or pull request,
+  # but only for the master branch
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    name: Bazel
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v2
+      if: github.event.action == 'opened' || github.event.action == 'synchronize' || github.event.ref == 'refs/heads/master'
+
+    - uses: actions/cache@v2
+      id: caching-stage
+      name: Cache Bazel artifacts
+      with:
+        path: |
+          .bazel-cache
+          bin
+          /home/runner/.cache
+        key: ${{ runner.os }}-bazel-${{ github.run_id }}
+        restore-keys: |
+          ${{ runner.os }}-bazel-
+
+    - name: Download/cache bazel version
+      if: steps.caching-stage.outputs.cache-hit != 'true'
+      run: |
+        if [ ! -f bin/bazel ]; then
+          curl -LO "https://github.com/bazelbuild/bazel/releases/download/3.1.0/bazel-3.1.0-linux-x86_64"
+          mv bazel-3.1.0-linux-x86_64 "bin/bazel"
+          chmod +x "bin/bazel"
+        fi
+
+    - name: Build & test
+      run: |
+        bin/bazel test --config=ci --test_tag_filters=language-test //...
+        bin/bazel test --config=ci //semantic-source //semantic:spec
diff --git a/WORKSPACE b/WORKSPACE
index e446d38dd..e0a7490d1 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -8,13 +8,6 @@ workspace(name = "semantic")
 # Load the repository rule to download an http archive.
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
-# Load the ability to check out a git repository.
-load(
-    "@bazel_tools//tools/build_defs/repo:git.bzl",
-    "git_repository",
-    "new_git_repository",
-)
-
 # Download rules_haskell and make it accessible as "@rules_haskell".
 #
 # Note: the git_repository clause is a workaround until rules_haskell#1349 [1]
@@ -29,10 +22,11 @@ load(
 #     strip_prefix = "rules_haskell-0.12",
 #     urls = ["https://github.com/tweag/rules_haskell/archive/v0.12.tar.gz"],
 # )
-git_repository(
+http_archive(
     name = "rules_haskell",
-    remote = "https://github.com/tweag/rules_haskell",
-    commit = "abaec6502a4474f10b3c367fb5e90173ee0e349c",
+    sha256 = "78d017aa732b430c0681fff4514503af78a8d8c44df165e603a9433745b16e5e",
+    strip_prefix = "rules_haskell-abaec6502a4474f10b3c367fb5e90173ee0e349c",
+    urls = ["https://github.com/tweag/rules_haskell/archive/abaec6502a4474f10b3c367fb5e90173ee0e349c.tar.gz"],
 )
 
 load(
@@ -249,11 +243,11 @@ tree_sitter_node_types_hackage(
 
 # Download lingo (which has its own Bazel build instructions).
 
-git_repository(
+http_archive(
     name = "lingo",
-    commit = "6614b9afe1a519364491c170d6b06ff5cd96153a",
-    remote = "https://github.com/tclem/lingo-haskell.git",
-    shallow_since = "1593202797 -0400",
+    sha256 = "32a5e2d66e4620ff7004acab4802dc948b852ce26725012283a85d41af97275f",
+    strip_prefix = "lingo-haskell-6614b9afe1a519364491c170d6b06ff5cd96153a",
+    urls = ["https://github.com/tclem/lingo-haskell/archive/6614b9afe1a519364491c170d6b06ff5cd96153a.tar.gz"],
 )
 
 load("//:build/example_repos.bzl", "declare_example_repos")
diff --git a/build/common.bzl b/build/common.bzl
index 3b591ff75..5fd0ea115 100644
--- a/build/common.bzl
+++ b/build/common.bzl
@@ -9,10 +9,6 @@ load(
     "@bazel_tools//tools/build_defs/repo:http.bzl",
     "http_archive",
 )
-load(
-    "@bazel_tools//tools/build_defs/repo:git.bzl",
-    "new_git_repository",
-)
 
 DEVELOPMENT_GHC_FLAGS = ["-O0"]
 RELEASE_GHC_FLAGS = ["-O1"]
diff --git a/build/example_repos.bzl b/build/example_repos.bzl
index 46ae6b869..c006fcad5 100644
--- a/build/example_repos.bzl
+++ b/build/example_repos.bzl
@@ -1,7 +1,6 @@
 load(
-    "@bazel_tools//tools/build_defs/repo:git.bzl",
-    "git_repository",
-    "new_git_repository",
+    "@bazel_tools//tools/build_defs/repo:http.bzl",
+    "http_archive",
 )
 
 _all_example_repos = {
@@ -11,8 +10,7 @@ _all_example_repos = {
         ],
         "commit": "058851c5cfc98f50f11237b1c13d77cfd1f40475",
         "repo": "numpy/numpy",
-        "since": "",
-        "excludes": [],
+        "sha256": "8e60c567cbab3309afa9508ee61dfd207089ebb0056214fe60e863d81e098824",
     },
     "python": {
         "data": [
@@ -20,7 +18,8 @@ _all_example_repos = {
         ],
         "commit": "c6be53e1c43f870f5364eef1499ee1b411c966fb",
         "repo": "thealgorithms/python",
-        "since": "1548508158 +0800",
+        "prefix": "Python",
+        "sha256": "bef087151bea1e479701d0ceed831809c1b916f513752dee914e9c7876b46ea9",
         "excludes": [
             "**/data structures/*",
             "**/binary tree/*",
@@ -35,8 +34,7 @@ _all_example_repos = {
         ],
         "commit": "0b5b4a66ef99c8b91569dd9b9b34911834689d3f",
         "repo": "pallets/flask",
-        "since": "",
-        "excludes": [],
+        "sha256": "224d406f11b13cc8e4c7defd8dc94e0df957c1c90977172cfaa2ee88d8f85e77",
     },
     "httpie": {
         "data": [
@@ -44,8 +42,7 @@ _all_example_repos = {
         ],
         "commit": "358342d1c915d6462a080a77aefbb20166d0bd5d",
         "repo": "jakubroztocil/httpie",
-        "since": "",
-        "excludes": [],
+        "sha256": "2b3172369954d883a2a609dc6bc34a944ce9817afb14733d87f208a40529899c",
     },
     "keras": {
         "data": [
@@ -53,17 +50,15 @@ _all_example_repos = {
         ],
         "commit": "e59570ae26670f788d6c649191031e4a8824f955",
         "repo": "keras-team/keras",
-        "since": "1548927621 +0530",
-        "excludes": [],
+        "sha256": "2bda5bfd2a2b43d9f4d191e4ed980740429bb86d75e16355b1d33faf9d974ffd",
     },
     "requests": {
         "data": [
             "**/*.py",
         ],
         "commit": "64bde6582d9b49e9345d9b8df16aaa26dc372d13",
+        "sha256": "8f9466ad314b2741c826b164b46bcedb260d424f717fd9553fea5164f493bd20",
         "repo": "requests/requests",
-        "since": "",
-        "excludes": [],
     },
     "scikit-learn": {
         "data": [
@@ -71,17 +66,15 @@ _all_example_repos = {
         ],
         "commit": "d0f63a760d9993a7f68cfc5e1a075700d67c53d3",
         "repo": "scikit-learn/scikit-learn",
-        "since": "",
-        "excludes": [],
+        "sha256": "4f337b87d45cabd7db9cd3883fd5168accad7f78bc48df3ae633832b4d0f30d0",
     },
     "scrapy": {
         "data": [
             "**/*.py",
         ],
         "commit": "65d631329a1434ec013f24341e4b8520241aec70",
+        "sha256": "27b2dc9b1a55c356eeec651c76fe82be082c0e8980b2e4d9b99a4f63c733685b",
         "repo": "scrapy/scrapy",
-        "since": "1548908933 -0300",
-        "excludes": [],
     },
     "pytorch": {
         "data": [
@@ -89,17 +82,15 @@ _all_example_repos = {
         ],
         "commit": "c865d46736db4afff51690a712e35ed8e3899490",
         "repo": "pytorch/pytorch",
-        "since": "1549068372 -0800",
-        "excludes": [],
+        "sha256": "7b54b7a3c40aaf68bb9bd7dcc509389d29c5c37241f29c003bd04cd0dafb60ce",
     },
     "certbot": {
         "data": [
             "**/*.py",
         ],
         "commit": "bb8222200a8cbd39a3ce9584ce6dfed6c5d05228",
+        "sha256": "3477f4c04897f7874249e6362567384246f409c62e1ff18c4d6fa54813f484c2",
         "repo": "certbot/certbot",
-        "since": "1549052531 -0800",
-        "excludes": [],
     },
     "spec": {
         "data": [
@@ -107,8 +98,7 @@ _all_example_repos = {
         ],
         "commit": "c3e6b9017926f44a76e2b966c4dd35fa84c4cd3b",
         "repo": "ruby/spec",
-        "since": "",
-        "excludes": [],
+        "sha256": "33206954ff6fdbf5b872298efc2697c18ad5371eb55007d54f95c08ec7f46bb4",
     },
     "desktop": {
         "data": [
@@ -116,15 +106,17 @@ _all_example_repos = {
         ],
         "commit": "d1324f56d02dd9afca5d2e9da545905a7d41d671",
         "repo": "desktop/desktop",
-        "since": "1523834029 +1000",
-        "excludes": [],
+        "sha256": "cfd1c6d313ff4e756b59da83f3f7799e021e0d0fe94ee4a93638c9b1aa19b5ca",
     },
 }
 
 SEMANTIC_EXTERNAL_TEST_REPOSITORIES = ["@" + k + "//:src" for (k, v) in _all_example_repos.items()]
 
-def _example_repo(name, data, excludes, commit, repo, since):
-    new_git_repository(
+def _example_repo(name, data, repo, commit, since = "", excludes = [], sha256 = "", prefix = ""):
+    if prefix == "":
+        prefix = name
+
+    http_archive(
         name = name,
         build_file_content = """
 filegroup(
@@ -133,9 +125,9 @@ filegroup(
     visibility = ["//visibility:public"]
 )
 """.format(data, excludes),
-        commit = commit,
-        remote = "https://github.com/{}.git".format(repo),
-        shallow_since = since,
+        strip_prefix = prefix + "-" + commit,
+        sha256 = sha256,
+        urls = ["https://github.com/{repo}/archive/{commit}.tar.gz".format(repo = repo, commit = commit)],
     )
 
 def declare_example_repos():
diff --git a/build/tree_sitter.bzl b/build/tree_sitter.bzl
deleted file mode 100644
index 94938f61f..000000000
--- a/build/tree_sitter.bzl
+++ /dev/null
@@ -1,10 +0,0 @@
-# To provide access to node-types.json files and the contents
-# of the packages's corpus/ directory, we define a BUILD file
-# that will be injected, via the build_file_contents, into
-# the repositories that we download.
-
-package(default_visibility = ["//visibility:public"])
-
-exports_files(glob(["**/node-types.json"]))
-
-filegroup(name = "corpus", srcs = glob(["**/corpus/*.txt"]))
diff --git a/docs/build.md b/docs/build.md
index 87a0d9530..28151f0c2 100644
--- a/docs/build.md
+++ b/docs/build.md
@@ -42,6 +42,7 @@ If this seems complicated, don't worry: most of the time you'll be able to skip
 3. **Some packages come with GHC and are not loaded from Stackage**. These include `base`, `containers`, and [others](https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/8.10.1-notes.html?highlight=bytestring#included-libraries). To depend on those packages, you use `//:base`, `//:containers`, etc. They are specified in the `BAZEL.build` at the project root. You probably won't need to add any more.
 4. **Getting weird errors from the C compiler?** Try setting `export BAZEL_USE_CPP_ONLY_TOOLCHAIN=1` in your `.profile` or whatnot.
 
+
 ## Quick reference links
 
 * **Bazel manual**: https://docs.bazel.build/versions/3.3.0/bazel-overview.html
diff --git a/semantic/BUILD.bazel b/semantic/BUILD.bazel
index c12037696..88ba215e1 100644
--- a/semantic/BUILD.bazel
+++ b/semantic/BUILD.bazel
@@ -180,7 +180,6 @@ haskell_test(
 
 haskell_test(
     name = "parse-examples",
-    timeout = "long",
     srcs = [
         "test/Examples.hs",
     ],