diff --git a/README.md b/README.md
index 4010d7e..4c4013b 100644
--- a/README.md
+++ b/README.md
@@ -279,33 +279,6 @@ cat email.eml | ./happyDeliver analyze -recipient test-uuid@yourdomain.com
 
 **Note:** In production, emails are delivered via LMTP (see integration instructions above).
 
-## Use with happyDomain
-
-happyDeliver can be driven by [happyDomain](https://happydomain.org) through
-the [`checker-happydeliver`](https://git.nemunai.re/happyDomain/checker-happydeliver)
-plugin, so the deliverability of a domain you manage is monitored alongside
-its DNS and inbound SMTP posture.
-
-How it works:
-
-1. Attach the **Outbound deliverability** checker to the mail service of a zone
-   in happyDomain. Point it at a happyDeliver instance via `happydeliver_url`;
-   operators can configure a default instance globally.
-2. On each run, the checker calls `POST /api/test` to allocate a fresh
-   recipient address, prompts the user (or an automated sender) to mail it from
-   the tested domain, then polls `GET /api/test/{id}` until the report is
-   ready.
-3. The structured report from `GET /api/report/{id}` is translated into
-   happyDomain rule states: CRIT/WARN/INFO on SPF, DKIM, DMARC, alignment, spam
-   score, blacklists and headers, plus an overall score threshold
-   (`min_score`/`warn_score`).
-4. Runs repeat on a configurable interval so a regression in deliverability (a
-   new RBL listing, a DKIM key rotation gone wrong, a broken SPF include, ...)
-   surfaces as a domain-level alert in happyDomain.
-
-See the [`checker-happydeliver` repository](https://git.nemunai.re/happyDomain/checker-happydeliver)
-for build instructions and the full list of run options.
-
 ## Scoring System
 
 The deliverability score is calculated from A to F based on:
diff --git a/go.mod b/go.mod
index e58ba52..8ae9e38 100644
--- a/go.mod
+++ b/go.mod
@@ -50,7 +50,7 @@ require (
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/mohae/deepcopy v0.0.0-20170929034955-c48cc78d4826 // indirect
-	github.com/oapi-codegen/oapi-codegen/v2 v2.7.0 // indirect
+	github.com/oapi-codegen/oapi-codegen/v2 v2.6.0 // indirect
 	github.com/oasdiff/yaml v0.0.0-20250309154309-f31be36b4037 // indirect
 	github.com/oasdiff/yaml3 v0.0.0-20250309153720-d2182401db90 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect