diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
new file mode 100644
index 0000000..a9a63ff
--- /dev/null
+++ b/.github/workflows/CI.yml
@@ -0,0 +1,46 @@
+name: CI
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+    tags: '*'
+jobs:
+  test:
+    name: Julia ${{ matrix.version }} - ${{ matrix.os }} - ${{ matrix.arch }} - ${{ github.event_name }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        version:
+          - '1.3'
+          - '1.6'
+#          - 'nightly'
+        os:
+          - ubuntu-latest
+#          - macOS-latest
+#          - windows-latest
+        arch:
+          - x64
+    steps:
+      - uses: actions/checkout@v2
+      - uses: julia-actions/setup-julia@v1
+        with:
+          version: ${{ matrix.version }}
+          arch: ${{ matrix.arch }}
+      - uses: actions/cache@v1
+        env:
+          cache-name: cache-artifacts
+        with:
+          path: ~/.julia/artifacts
+          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
+          restore-keys: |
+            ${{ runner.os }}-test-${{ env.cache-name }}-
+            ${{ runner.os }}-test-
+            ${{ runner.os }}-
+      - uses: julia-actions/julia-buildpkg@v1
+      - uses: julia-actions/julia-runtest@v1
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v1
+        with:
+          file: lcov.info
diff --git a/.github/workflows/TagBot.yml b/.github/workflows/TagBot.yml
new file mode 100644
index 0000000..d77d3a0
--- /dev/null
+++ b/.github/workflows/TagBot.yml
@@ -0,0 +1,11 @@
+name: TagBot
+on:
+  schedule:
+    - cron: 0 * * * *
+jobs:
+  TagBot:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: JuliaRegistries/TagBot@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
diff --git a/src/regression.jl b/src/regression.jl
index 938bf43..7db4371 100644
--- a/src/regression.jl
+++ b/src/regression.jl
@@ -9,7 +9,7 @@ function chebregression(x::AbstractVector{SVector{N,Td}}, y::AbstractVector{T},
     # assemble rhs as matrix
     Y = Array{float(eltype(T))}(undef, length(y), length(first(y)))
     for j = 1:length(y)
-        Y[j,:] .= y[j + (begin-1)]
+        Y[j,:] .= y[j + (firstindex(y)-1)]
     end
 
     # assemble lhs matrix
@@ -22,7 +22,7 @@ function chebregression(x::AbstractVector{SVector{N,Td}}, y::AbstractVector{T},
     for i = 1:length(c.coefs)
         c.coefs[i] = 1 # basis function
         for j = 1:length(x)
-            A[j,i] = c(x[j + (begin-1)])
+            A[j,i] = c(x[j + (firstindex(x)-1)])
         end
         c.coefs[i] = 0 # reset
     end