diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 23472eb..a5a08d5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,15 +14,15 @@ jobs:
       - uses: extractions/setup-just@v3
       - uses: actions/setup-go@v6
         with:
+          # TODO: The version of golangci-lint we use is not compatible with Go 1.26+, migrate to new version
           go-version: '1.25'
-        # install must occur in the same step as the linter to run properly on CI
       - name: Lint project
         run: just install lint
   build:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: ['1.16', '1.17', '1.18', '1.19', '1.20', '1.21', '1.22', '1.23', '1.24', '1.25']
+        go-version: ['1.16', '1.17', '1.18', '1.19', '1.20', '1.21', '1.22', '1.23', '1.24', '1.25', '1.26']
     steps:
       - uses: actions/checkout@v6
       - uses: extractions/setup-just@v3
@@ -38,24 +38,11 @@ jobs:
       - uses: extractions/setup-just@v3
       - uses: actions/setup-go@v6
         with:
-          go-version: '1.25'
-      - name: Run coverage report
+          go-version: '1.26'
+      - name: Run tests
         run: EASYPOST_TEST_API_KEY=123 EASYPOST_PROD_API_KEY=123 just install coverage
-  coveralls:
-    if: github.ref == 'refs/heads/master'
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v6
-      - uses: extractions/setup-just@v3
-      - uses: actions/setup-go@v6
+      - name: Coverage
+        if: github.ref == 'refs/heads/master'
+        uses: codecov/codecov-action@v5
         with:
-          # NOTE: goveralls is not compatibile with go v1.22+, must remain on v1.21 max
-          go-version: '1.21'
-      - name: Run coverage report
-        run: EASYPOST_TEST_API_KEY=123 EASYPOST_PROD_API_KEY=123 just install coverage
-      - name: Install goveralls
-        run: go install github.com/mattn/goveralls@latest
-      - name: Coveralls
-        env:
-          COVERALLS_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: goveralls -coverprofile=covprofile -service=github
+          token: ${{ secrets.CODECOV_TOKEN }}
diff --git a/README.md b/README.md
index 569d94a..7f74a73 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,7 @@
 # EasyPost Go Client Library
 
 [![CI](https://github.com/EasyPost/easypost-go/workflows/CI/badge.svg)](https://github.com/EasyPost/easypost-go/actions?query=workflow%3ACI)
-[![Coverage Status](https://coveralls.io/repos/github/EasyPost/easypost-go/badge.svg?branch=master)](https://coveralls.io/github/EasyPost/easypost-go?branch=master)
+[![codecov](https://codecov.io/gh/EasyPost/easypost-go/graph/badge.svg?token=BW6X4DO2FT)](https://codecov.io/gh/EasyPost/easypost-go)
 [![GitHub version](https://badge.fury.io/gh/EasyPost%2Feasypost-go.svg)](https://badge.fury.io/gh/EasyPost%2Feasypost-go)
 [![GoDoc](https://godoc.org/github.com/EasyPost/easypost-go?status.svg)](https://pkg.go.dev/github.com/EasyPost/easypost-go)
 
diff --git a/justfile b/justfile
index 7d13c0e..3d4232a 100644
--- a/justfile
+++ b/justfile
@@ -10,9 +10,9 @@ clean:
 # Get test coverage and open it in a browser
 coverage:
     go clean -testcache
-    go test -coverprofile=covprofile ./...
-    bash -c 'statement_cov=$(go tool cover -func=covprofile | grep total: | awk "{print substr(\$NF, 1, length(\$NF)-1)}"); if [ $(echo "$statement_cov < 78.0" | bc) -eq 1 ]; then echo "Tests passed but statement coverage failed with coverage: $statement_cov"; exit 1; fi'
-    go tool cover -html=covprofile
+    go test -coverprofile=cover.out ./...
+    bash -c 'statement_cov=$(go tool cover -func=cover.out | grep total: | awk "{print substr(\$NF, 1, length(\$NF)-1)}"); if [ $(echo "$statement_cov < 78.0" | bc) -eq 1 ]; then echo "Tests passed but statement coverage failed with coverage: $statement_cov"; exit 1; fi'
+    go tool cover -html=cover.out
 
 # Initialize the examples submodule
 init-examples-submodule: