diff --git a/.github/workflows/verify.yaml b/.github/workflows/verify.yaml
index 6654df0..6001965 100644
--- a/.github/workflows/verify.yaml
+++ b/.github/workflows/verify.yaml
@@ -43,7 +43,8 @@ jobs:
     - name: Run linters
       uses: golangci/golangci-lint-action@v9
       with:
-       version: v2.11.4
+       # Floor for go 1.27 callers: a linter built with an older Go can't load the config.
+       version: v2.13.2
        args: --timeout=6m
        working-directory: _caller
   test:
diff --git a/.golangci.yml b/.golangci.yml
index 1e6dfd9..7ab6339 100644
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -39,6 +39,10 @@ linters:
   settings:
     exhaustive:
       default-signifies-exhaustive: true
+    goconst:
+      # goconst v1.9.0 reports literals inside composite literals; these hold the prior signal.
+      ignore-map-keys: true
+      min-occurrences: 6
     gocritic:
       enabled-checks:
         - ruleguard