diff --git a/README.md b/README.md
index b2691fa..a835de1 100644
--- a/README.md
+++ b/README.md
@@ -74,6 +74,10 @@ reason (`issuer`, `audience`, `expired_or_not_yet_valid`, `signature_or_keys`,
 and unverified token metadata (`alg`, `kid`, `iss`, `aud`, `azp`, `iat`, `nbf`,
 `exp`, the JSON type of `groups`). It never contains the token, its signature,
 or a personal claim. A 401 with no such line was answered by the edge.
+The same 401 expires the edge's session cookies for this host
+(`edge_cookies_expired=<n>` in the line), so the SPA's navigation to `/` runs a
+real sign-in and receives a newly minted token instead of replaying the refused
+one. The SSO session and other apps' sessions are not touched.
 
 PostgreSQL integration tests are opt-in: they skip when both
 `BUILTIN_APPSERVER_TEST_DATABASE_URL` and `BUILDER_CONSOLE_TEST_DATABASE_URL` are unset.
@@ -98,14 +102,14 @@ a required BuildKit secret, never through build arguments or committed files.
 
 ## Catalog and release
 
-The next app release is **0.1.8**, also recorded in `web/package.json`.
+The next app release is **0.1.9**, also recorded in `web/package.json`.
 `catalog/entry.yaml` carries no committed version: the first tag (`v0.1.0`)
 created `versions[]` with `ghcr.io/appthrust/tracker@sha256:<index-digest>`,
 stream `0.1`; later tags append at publication time. Do not add a version with
 an unbuilt or placeholder image digest. OpenAPI's `info.version` describes the
 API schema, not the app release. This repository has no hand-maintained changelog.
 
-After the release prerequisites are available, push the SemVer tag `v0.1.8`.
+After the release prerequisites are available, push the SemVer tag `v0.1.9`.
 The tag workflow:
 
 1. Performs one multi-platform build on `ubuntu-24.04` for Linux amd64 and arm64,
@@ -125,8 +129,8 @@ The tag workflow:
 Publication commands used by the workflow:
 
 ```sh
-bun hack/publish-entry.ts submit --version 0.1.8 --digest sha256:<image-index-digest>
-bun hack/publish-entry.ts await --version 0.1.8 --digest sha256:<image-index-digest>
+bun hack/publish-entry.ts submit --version 0.1.9 --digest sha256:<image-index-digest>
+bun hack/publish-entry.ts await --version 0.1.9 --digest sha256:<image-index-digest>
 ```
 
 Writers are serialized by `tracker-catalog-publish`; the workflow is guarded to
@@ -147,7 +151,7 @@ After publication, each estate's `AppCatalogSource` syncs the signed catalog.
 Install Issues from the Project Marketplace (Directory is an automatic
 dependency). Existing `follow` installations on stream `0.1` roll to the new
 version; `pinned` installations show `UpdateAvailable` and require an explicit
-version update. Confirm the installation is Ready, `/releasez` reports `0.1.8`,
+version update. Confirm the installation is Ready, `/releasez` reports `0.1.9`,
 and a signed-in Tracker page lists the Epics page in the navigation. These are release steps,
 not actions performed by a source-only version bump.
 
diff --git a/cmd/server/internal/api/api.go b/cmd/server/internal/api/api.go
index 2e44cc9..9e41bfb 100644
--- a/cmd/server/internal/api/api.go
+++ b/cmd/server/internal/api/api.go
@@ -169,7 +169,7 @@ func (a *API) authenticate(w http.ResponseWriter, r *http.Request) (identity.Ide
 		} else {
 			// The edge has already accepted this session, so a 401 here is the app
 			// disagreeing with the edge about the token; record why.
-			log.Printf("tracker auth rejected: %s %s request_id=%q %s", r.Method, r.URL.Path, r.Header.Get("X-Request-Id"), describeRejection(r.Header.Get("Authorization"), err))
+			log.Printf("tracker auth rejected: %s %s request_id=%q %s edge_cookies_expired=%d", r.Method, r.URL.Path, r.Header.Get("X-Request-Id"), describeRejection(r.Header.Get("Authorization"), err), expireEdgeSession(w, r))
 			httpx.WriteError(w, httpx.Fail(401, "unauthenticated", "A valid bearer token is required"), "tracker")
 		}
 		return identity.Identity{}, "", false
diff --git a/cmd/server/internal/api/authlog.go b/cmd/server/internal/api/authlog.go
index fa8d3cc..4d1126e 100644
--- a/cmd/server/internal/api/authlog.go
+++ b/cmd/server/internal/api/authlog.go
@@ -4,6 +4,8 @@ import (
 	"encoding/base64"
 	"encoding/json"
 	"fmt"
+	"net/http"
+	"regexp"
 	"strings"
 )
 
@@ -96,3 +98,24 @@ func jsonType(value json.RawMessage) string {
 		return "scalar"
 	}
 }
+
+// edgeSessionCookie matches the cookies the edge OIDC filter keeps for this
+// host: its tokens, their HMAC and expiry, and the in-flight sign-in state.
+var edgeSessionCookie = regexp.MustCompile(`^(IdToken|AccessToken|RefreshToken|OauthHMAC|OauthExpires|OauthNonce|CodeVerifier)(-[0-9a-f]+)?$`)
+
+// expireEdgeSession drops the edge's session cookies from the browser and
+// reports how many it expired. The edge only checks its own HMAC and expiry,
+// so it keeps replaying a token this server refuses; without the cookies the
+// next navigation runs sign-in again and mints a new token from the still
+// valid SSO session, which a plain reload does not. Other apps' sessions and
+// the SSO session itself are untouched.
+func expireEdgeSession(w http.ResponseWriter, r *http.Request) int {
+	expired := 0
+	for _, cookie := range r.Cookies() {
+		if edgeSessionCookie.MatchString(cookie.Name) {
+			http.SetCookie(w, &http.Cookie{Name: cookie.Name, Path: "/", MaxAge: -1, Secure: true, HttpOnly: true})
+			expired++
+		}
+	}
+	return expired
+}
diff --git a/cmd/server/internal/api/authlog_test.go b/cmd/server/internal/api/authlog_test.go
index 02efb57..e64e75e 100644
--- a/cmd/server/internal/api/authlog_test.go
+++ b/cmd/server/internal/api/authlog_test.go
@@ -3,6 +3,8 @@ package api
 import (
 	"encoding/base64"
 	"errors"
+	"net/http"
+	"net/http/httptest"
 	"testing"
 
 	"github.com/stretchr/testify/require"
@@ -37,3 +39,21 @@ func TestDescribeRejection(t *testing.T) {
 		})
 	}
 }
+
+func TestExpireEdgeSession(t *testing.T) {
+	request := httptest.NewRequest(http.MethodGet, "/api/tracker/v1/me", nil)
+	for _, name := range []string{"AccessToken-a2389e50", "IdToken-a2389e50", "RefreshToken-a2389e50", "OauthHMAC-a2389e50", "OauthExpires-a2389e50", "tracker-locale", "AccessTokenOther", "KEYCLOAK_SESSION"} {
+		request.AddCookie(&http.Cookie{Name: name, Value: "value"})
+	}
+	recorder := httptest.NewRecorder()
+	require.Equal(t, 5, expireEdgeSession(recorder, request))
+	names := []string{}
+	for _, cookie := range recorder.Result().Cookies() {
+		require.Equal(t, "/", cookie.Path)
+		require.Negative(t, cookie.MaxAge)
+		require.Empty(t, cookie.Domain)
+		require.Empty(t, cookie.Value)
+		names = append(names, cookie.Name)
+	}
+	require.ElementsMatch(t, []string{"AccessToken-a2389e50", "IdToken-a2389e50", "RefreshToken-a2389e50", "OauthHMAC-a2389e50", "OauthExpires-a2389e50"}, names)
+}
diff --git a/web/package.json b/web/package.json
index 9175426..fa73952 100644
--- a/web/package.json
+++ b/web/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@appthrust/tracker",
-  "version": "0.1.8",
+  "version": "0.1.9",
   "private": true,
   "type": "module",
   "scripts": {