diff --git a/activityPub.go b/activityPub.go
index d9110e3..4f487fb 100644
--- a/activityPub.go
+++ b/activityPub.go
@@ -59,7 +59,7 @@ func (a *goBlog) initActivityPub() error {
 		return err
 	}
 	a.apSigner, _, err = httpsig.NewSigner(
-		[]httpsig.Algorithm{httpsig.ED25519, httpsig.RSA_SHA512, httpsig.RSA_SHA256},
+		[]httpsig.Algorithm{httpsig.RSA_SHA256},
 		httpsig.DigestSha256,
 		[]string{httpsig.RequestTarget, "date", "host", "digest"},
 		httpsig.Signature,
@@ -546,10 +546,10 @@ func (a *goBlog) signRequest(r *http.Request, blogIri string) error {
 	if host := r.Header.Get("Host"); host == "" {
 		r.Header.Set("Host", r.URL.Host)
 	}
-	var bodyBuf bytes.Buffer
+	bodyBuf := bytes.NewBufferString("")
 	if r.Body != nil {
-		if _, err := io.Copy(&bodyBuf, r.Body); err == nil {
-			r.Body = io.NopCloser(&bodyBuf)
+		if _, err := io.Copy(bodyBuf, r.Body); err == nil {
+			r.Body = io.NopCloser(bodyBuf)
 		}
 	}
 	a.apSignMutex.Lock()
diff --git a/go.mod b/go.mod
index 5a16887..d767d47 100644
--- a/go.mod
+++ b/go.mod
@@ -46,7 +46,7 @@ require (
 	github.com/mmcdole/gofeed v1.1.3
 	github.com/paulmach/go.geojson v1.4.0
 	github.com/posener/wstest v1.2.0
-	github.com/pquerna/otp v1.3.0
+	github.com/pquerna/otp v1.4.0
 	github.com/samber/lo v1.36.0
 	github.com/schollz/sqlite3dump v1.3.1
 	github.com/snabb/sitemap v1.0.0
diff --git a/go.sum b/go.sum
index 38127d5..5d83083 100644
--- a/go.sum
+++ b/go.sum
@@ -342,8 +342,8 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/posener/wstest v1.2.0 h1:PAY0cRybxOjh0yqSDCrlAGUwtx+GNKpuUfid/08pv48=
 github.com/posener/wstest v1.2.0/go.mod h1:GkplCx9zskpudjrMp23LyZHrSonab0aZzh2x0ACGRbU=
-github.com/pquerna/otp v1.3.0 h1:oJV/SkzR33anKXwQU3Of42rL4wbrffP4uvUf1SvS5Xs=
-github.com/pquerna/otp v1.3.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
+github.com/pquerna/otp v1.4.0 h1:wZvl1TIVxKRThZIBiwOOHOGP/1+nZyWBil9Y2XNEDzg=
+github.com/pquerna/otp v1.4.0/go.mod h1:dkJfzwRKNiegxyNb54X/3fLwhCynbMspSyWKnvi1AEg=
 github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
 github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/rogpeppe/go-internal v1.3.0/go.mod h1:M8bDsm7K2OlrFYOpmOWEs/qY81heoFRclV5y23lUDJ4=