diff --git a/.github/workflows/config_check.yml b/.github/workflows/config_check.yml
new file mode 100644
index 000000000000..24767dd07583
--- /dev/null
+++ b/.github/workflows/config_check.yml
@@ -0,0 +1,40 @@
+---
+name: config check
+on:
+  pull_request:
+  push:
+    branches:
+      - main
+permissions:
+  contents: read
+jobs:
+  config-check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      # Use this action, rather than a file filter so that we can make this
+      # mandatory.
+      # See https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#example-including-branches
+      # for more details.
+      - uses: dorny/paths-filter@v4
+        id: filter
+        with:
+          filters: |
+            librarian:
+              - 'librarian.yaml'
+              - '.librarian/**'
+      - name: Config check
+        if: steps.filter.outputs.librarian == 'true'
+        run: |
+          V="$(sed -n 's/^version: *//p' librarian.yaml)"
+          go run "github.com/googleapis/librarian/tool/cmd/configcheck@${V}" .
+      - name: Update library versions and regenerate
+        if: failure()
+        run: |
+          echo "Library version is different between state.yaml and librarian.yaml.
+          Update versions in the configs according to the error message and
+          regenerate libraries using:
+          
+          V=\$(sed -n 's/^version: *//p' librarian.yaml)
+          go run github.com/googleapis/librarian/cmd/librarian@\${V} generate --all
+          "
diff --git a/internal/generated/snippets/pubsub/v2/apiv1/snippet_metadata.google.pubsub.v1.json b/internal/generated/snippets/pubsub/v2/apiv1/snippet_metadata.google.pubsub.v1.json
index 0b0ceed421a7..91584fa82796 100644
--- a/internal/generated/snippets/pubsub/v2/apiv1/snippet_metadata.google.pubsub.v1.json
+++ b/internal/generated/snippets/pubsub/v2/apiv1/snippet_metadata.google.pubsub.v1.json
@@ -8,7 +8,7 @@
     ],
     "language": "GO",
     "name": "cloud.google.com/go/pubsub/v2/apiv1",
-    "version": "2.5.0"
+    "version": "2.5.1"
   },
   "snippets": [
     {
diff --git a/librarian.yaml b/librarian.yaml
index 3256cbafb874..fbf2100e2bde 100644
--- a/librarian.yaml
+++ b/librarian.yaml
@@ -939,7 +939,7 @@ libraries:
       - README.md
       - internal/version.go
   - name: pubsub
-    version: 1.50.1
+    version: 1.50.2
     keep:
       - README.md
       - internal/version.go
@@ -947,7 +947,7 @@ libraries:
     go:
       nested_module: v2
   - name: pubsub/v2
-    version: 2.5.0
+    version: 2.5.1
     apis:
       - path: google/pubsub/v1
     keep:
diff --git a/pubsub/internal/version.go b/pubsub/internal/version.go
index 057380beb1d8..49f33b425ad5 100644
--- a/pubsub/internal/version.go
+++ b/pubsub/internal/version.go
@@ -17,4 +17,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "1.50.1"
+const Version = "1.50.2"
diff --git a/pubsub/v2/internal/version.go b/pubsub/v2/internal/version.go
index caf2a4a7816b..469b4e4e11b5 100644
--- a/pubsub/v2/internal/version.go
+++ b/pubsub/v2/internal/version.go
@@ -17,4 +17,4 @@
 package internal
 
 // Version is the current tagged release of the library.
-const Version = "2.5.0"
+const Version = "2.5.1"