diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 2e3b23c..4f112ea 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -17,13 +17,17 @@ jobs:
           cd "$base"
 
           # Source repo carrying GitHub-style hidden refs (refs/pull/*,
-          # refs/github-services/*) next to a regular branch, tag and note.
+          # refs/github-services/*) next to regular branches, tags and a note.
+          # Includes nested (slashed) branch and tag names, which must still be
+          # mirrored.
           git init -q --bare source.git
           work="$(mktemp -d)"
           git clone -q source.git "$work"
           git -C "$work" -c user.email=t@t -c user.name=t commit -q --allow-empty -m init
           git -C "$work" push -q origin HEAD:main
+          git -C "$work" push -q origin HEAD:refs/heads/feature/foo
           git -C "$work" push -q origin HEAD:refs/tags/v1
+          git -C "$work" push -q origin HEAD:refs/tags/release/1.0.0
           c="$(git --git-dir=source.git rev-parse refs/heads/main)"
           git --git-dir=source.git update-ref refs/pull/1/head "$c"
           git --git-dir=source.git update-ref refs/github-services/pull/1/head "$c"
@@ -48,7 +52,8 @@ jobs:
           cd "$workdir"
           sh "$GITHUB_WORKSPACE/git-mirror.sh" "$base/source.git" "$base/dest.git" false
 
-          # The destination must contain exactly the branch and the tag.
+          # The destination must contain exactly the branches and tags,
+          # including the nested (slashed) ones, and nothing else.
           got="$(git --git-dir="$base/dest.git" for-each-ref --format '%(refname)' | sort | tr '\n' ' ')"
           echo "Destination refs: $got"
-          test "$got" = "refs/heads/main refs/tags/v1 "
+          test "$got" = "refs/heads/feature/foo refs/heads/main refs/tags/release/1.0.0 refs/tags/v1 "
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6510978..308f857 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.3.1] - 2026-07-21
+
+### Fixed
+* Mirror branches and tags with slashes in their name (e.g. `feature/foo`), which 1.3.0 unintentionally dropped.
+
 ## [1.3.0] - 2026-07-20
 
 ### Changed
@@ -19,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 * Initial release.
 
+[1.3.1]: https://github.com/wearerequired/git-mirror-action/compare/v1.3.0...v1.3.1
 [1.3.0]: https://github.com/wearerequired/git-mirror-action/compare/v1.2.0...v1.3.0
 [1.0.1]: https://github.com/wearerequired/git-mirror-action/compare/v1.0.0...v1.1.0
 [1.0.0]: https://github.com/wearerequired/git-mirror-action/compare/26c99373bfd4beb7811a3fd8a068ec944dadedcc...v1.0.0
diff --git a/git-mirror.sh b/git-mirror.sh
index 66dfe57..4f76b0c 100755
--- a/git-mirror.sh
+++ b/git-mirror.sh
@@ -19,8 +19,13 @@ git fetch -p origin
 # Only mirror branches and tags. GitHub advertises additional hidden refs
 # (e.g. refs/pull/*, refs/github-services/*) that destinations such as GitLab,
 # Bitbucket or Codeup reject, which fails the whole mirror push.
+#
+# The exclude patterns are given without a glob so they match the whole
+# namespace: a bare "refs/heads" matches every ref below it, whereas
+# "refs/heads/*" would only match one level and drop nested refs such as
+# refs/heads/feature/foo.
 git for-each-ref --format 'delete %(refname)' \
-	--exclude 'refs/heads/*' --exclude 'refs/tags/*' refs \
+	--exclude refs/heads --exclude refs/tags refs \
 	| git update-ref --stdin
 
 if [ "$DRY_RUN" = "true" ]