diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1e8ae79..39b9ef9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -96,11 +96,36 @@ jobs:
       run: |
         if grep -n "Disabling" test.log; then exit 1; fi
 
+  apidiff:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+    - uses: actions/checkout@v7
+      with:
+        fetch-depth: 0
+    - uses: actions/setup-go@v7
+      with:
+        go-version: stable
+    - name: Export the v1.4.0 API under the fork's module path
+      # The export is written and read in this same job, with one toolchain,
+      # because export data is bound to the Go version that produced it.
+      run: |
+        git worktree add "${{ runner.temp }}/v1.4.0" v1.4.0
+        cd "${{ runner.temp }}/v1.4.0"
+        sed -i 's#github.com/jmoiron/sqlx#github.com/secondwindoss/sqlx#g' go.mod $(git ls-files '*.go')
+        go run golang.org/x/exp/cmd/apidiff@v0.0.0-20261009195045-ca0d7ba23607 -m -w "${{ runner.temp }}/v1.4.0.export" github.com/secondwindoss/sqlx
+    - name: Fail on any incompatible change since v1.4.0
+      run: |
+        out="$(go run golang.org/x/exp/cmd/apidiff@v0.0.0-20261009195045-ca0d7ba23607 -m -incompatible "${{ runner.temp }}/v1.4.0.export" github.com/secondwindoss/sqlx)"
+        if [ -n "$out" ]; then echo "$out"; exit 1; fi
+        go run golang.org/x/exp/cmd/apidiff@v0.0.0-20261009195045-ca0d7ba23607 -m "${{ runner.temp }}/v1.4.0.export" github.com/secondwindoss/sqlx
+
   ci-ok:
     if: always()
     needs:
     - lint
     - test
+    - apidiff
     runs-on: ubuntu-latest
     steps:
     - name: Check required jobs