diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index ed21d28..03e75a9 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.13.0"
+  ".": "0.13.1"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 91e5bdf..af53962 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,9 +2,18 @@
 
 ## Unreleased
 
-### Changed
+## [0.13.1](https://github.com/promptfoo/crabcode/compare/v0.13.0...v0.13.1) (2026-03-18)
+
+### Features
+
+- **compare:** add PDF file comparison support ([#63](https://github.com/promptfoo/crabcode/issues/63)) ([b27e82b](https://github.com/promptfoo/crabcode/commit/b27e82bc2865f283c809350666264fa3a545a91d))
+- **compare:** auto-install poppler for PDF support ([#64](https://github.com/promptfoo/crabcode/issues/64)) ([3046322](https://github.com/promptfoo/crabcode/commit/3046322b0efc6a9c9305be86507e0ff8524262ea))
+- add crab tax plugin ([#66](https://github.com/promptfoo/crabcode/issues/66)) ([da92a99](https://github.com/promptfoo/crabcode/commit/da92a99f9266624919f5d286f37e6937a2f1536a))
+- default crabcode to codex ([#69](https://github.com/promptfoo/crabcode/issues/69)) ([3c4db33](https://github.com/promptfoo/crabcode/commit/3c4db3345ffc359bf35460b16915ca33510d842c))
+
+### Bug Fixes
 
-- Codex is now the default agent when `agent:` is omitted, `crab court` uses a Codex judge, and the top-level docs/examples reflect Codex-first defaults
+- **deps:** update dependency open to v11 ([4f717cb](https://github.com/promptfoo/crabcode/commit/4f717cbb69ce4783e86241a4b1a9a83687265d5f))
 
 ## [0.13.0] - 2026-03-11
 
@@ -69,6 +78,7 @@
 ## [0.8.0] - 2026-02-09
 
 ### Added
+
 - **Court Review system**: thorough multi-agent PR review with judge pattern
   - `crab court <PR>` — spawns Judge (Claude) + Reviewer A (Claude teammate) + Reviewer B (Codex)
   - Judge orchestrates reviewers, verifies findings by tracing actual code
@@ -82,17 +92,20 @@
   - `crab review show <PR>` displays saved review output
 
 ### Changed
+
 - Simplified review system: removed `--with-codex` and `collab` modes in favor of `crab court`
 - `crab review <PR>` now does quick single-agent review (fast, simple)
 - `crab court <PR>` is the thorough option (judge + 2 reviewers)
 
 ### Fixed
+
 - WIP restore now properly opens workspace when run from outside (was checking wrong directory)
 - Review sessions now run from session directory so Claude can write output files
 
 ## [0.7.0] - 2026-02-08
 
 ### Added
+
 - **Session management**: track and resume Claude conversations
   - `crab session ls` — list sessions with inline summaries
   - `crab session start "name"` — start new named session
@@ -108,6 +121,7 @@
   - PR context auto-fetched via gh CLI
 
 ### Changed
+
 - `crab restart` now fully recreates window layout (fixes missing panes after close)
 - Team mode always enabled (instructions in .claude/CLAUDE.md)
 - Removed `--team` flag (no longer needed)
@@ -115,6 +129,7 @@
 ## [0.6.0] - 2026-02-05
 
 ### Added
+
 - **Agent Teams integration**: team mode always enabled in workspaces
   - Team instructions auto-added to `.claude/CLAUDE.md`
   - Claude spawns agent teammates when tasks warrant parallel work
@@ -124,6 +139,7 @@
 ## [0.5.0] - 2026-02-04
 
 ### Added
+
 - **Multi-project support**: manage multiple repos from a single crabcode install
   - `crab @alias <cmd>` — run any command against a specific project
   - `crab projects` — list all registered projects with tmux status
@@ -135,6 +151,7 @@
 - Project context shown in `config`, `doctor`, `status`, and `help` output
 
 ### Changed
+
 - Config structure: project configs now live in `~/.crabcode/projects/<alias>.yaml`
 - Global config (`~/.crabcode/config.yaml`) now only stores `default_project`
 - Templates use `ALIAS_PLACEHOLDER` for `session_name` (was hardcoded `crab`)
@@ -142,6 +159,7 @@
 - `apply_template()` accepts a 4th `alias` parameter
 
 ### Fixed
+
 - `crab restart` from a workspace dir now correctly detects the owning project
 - Legacy config migration no longer clobbers global config on subsequent `crab init`
 
@@ -175,6 +193,7 @@
 ## [0.3.0] - 2026-01-15
 
 ### Added
+
 - Workspace handoff (`crab handoff`, `crab receive`)
 - Time travel / snapshots (`crab rewind`, `crab snapshot`)
 - Live pairing sessions (`crab pair`, `crab join`, `crab spectate`)
@@ -186,6 +205,7 @@
 ## [0.2.0] - 2026-01-10
 
 ### Added
+
 - WIP save/restore system with global index
 - Port spacing and env_sync with refs
 - MCP server sync from main repo
@@ -196,6 +216,7 @@
 ## [0.1.0] - 2026-01-05
 
 ### Added
+
 - Initial release
 - Tmux-based workspace management with git worktrees
 - Configurable layouts with named panes
diff --git a/src/crabcode b/src/crabcode
index faef762..63aa04f 100755
--- a/src/crabcode
+++ b/src/crabcode
@@ -27,7 +27,7 @@
 
 set -e
 
-VERSION="0.13.0" # x-release-please-version
+VERSION="0.13.1" # x-release-please-version
 CONFIG_DIR="$HOME/.crabcode"
 CONFIG_FILE="$CONFIG_DIR/config.yaml"
 WIP_BASE="$CONFIG_DIR/wip"