diff --git a/CHANGELOG.md b/CHANGELOG.md
index 973698f1..f781aab6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Update `protoc-gen-connect-openapi@latest` to 0.25.8.
+
 - Update `mise@latest` to 2026.8.16.
 
 - Update `kingfisher@latest` to 2.1.0.
diff --git a/manifests/protoc-gen-connect-openapi.json b/manifests/protoc-gen-connect-openapi.json
index 72ac4a67..bfd1e45a 100644
--- a/manifests/protoc-gen-connect-openapi.json
+++ b/manifests/protoc-gen-connect-openapi.json
@@ -18,10 +18,32 @@
     }
   },
   "latest": {
-    "version": "0.25.7"
+    "version": "0.25.8"
   },
   "0.25": {
-    "version": "0.25.7"
+    "version": "0.25.8"
+  },
+  "0.25.8": {
+    "x86_64_linux_musl": {
+      "etag": "0x8DF06AC4C8409BD",
+      "hash": "bd242227fe5500c56f6bb786cba745ad4c371c9107a0922661cec72f566dabeb"
+    },
+    "x86_64_macos": {
+      "etag": "0x8DF06AC4D118D4B",
+      "hash": "1683611e2bf6899bea8740e1e52af3281d8aa9fba41a8816e94dfb266156865c"
+    },
+    "x86_64_windows": {
+      "etag": "0x8DF06AC4C85B58D",
+      "hash": "ffb8aba3ad400e89be87ad36ec5bee4a240e11c71454482c3ebdbc493a8ef07e"
+    },
+    "aarch64_linux_musl": {
+      "etag": "0x8DF06AC4C7EB88E",
+      "hash": "35f6f651fec8d6cb08a3f2edb351ebdb58d7da6fca36310480f63b59beadf102"
+    },
+    "aarch64_windows": {
+      "etag": "0x8DF06AC4C911A64",
+      "hash": "164b52972927b7c9f12eab88aca875b140b36b298fc3e5525f106e790c426be1"
+    }
   },
   "0.25.7": {
     "x86_64_linux_musl": {