diff --git a/run-in-docker.sh b/run-in-docker.sh
index 7c2ad5b..b241267 100755
--- a/run-in-docker.sh
+++ b/run-in-docker.sh
@@ -8,4 +8,4 @@ docker run --rm \
     -v actions-goveralls-cache:/go/pkg/mod \
     -v actions-goveralls-cache:/root/.cache \
     -v "$CURRENT":/go/src/github.com/shogo82148/actions-goveralls \
-    -w /go/src/github.com/shogo82148/actions-goveralls golang:1.21.0 "$@"
+    -w /go/src/github.com/shogo82148/actions-goveralls golang:1.20.13 "$@"