diff --git a/recipes/rtk2/build.sh b/recipes/rtk2/build.sh
index 7961fbb423e85..0b901b830f550 100644
--- a/recipes/rtk2/build.sh
+++ b/recipes/rtk2/build.sh
@@ -1,15 +1,16 @@
-#!/bin/sh
-
+#!/bin/bash
 set -euxo pipefail
+
 mkdir -p "$PREFIX"/bin
 
-echo " Setting environment variables"
+echo "Setting environment variables"
 # Fix zlib
-export CFLAGS="$CFLAGS -I$PREFIX/include"
+export CFLAGS="$CFLAGS -O3 -I$PREFIX/include"
 export LDFLAGS="$LDFLAGS -L$PREFIX/lib"
-export CPATH=${PREFIX}/include
+export C_INCLUDE_PATH=${PREFIX}/include
 
 echo "RUN MAKE"
 make test
 
+chmod 755 rtk2
 mv rtk2 "$PREFIX"/bin/
diff --git a/recipes/rtk2/meta.yaml b/recipes/rtk2/meta.yaml
index 0aebea2760f7b..89654d1a8e8b7 100644
--- a/recipes/rtk2/meta.yaml
+++ b/recipes/rtk2/meta.yaml
@@ -1,12 +1,13 @@
-{% set version="2.10" %}
-{% set name="rtk2" %}
+{% set version = "2.11.1" %}
+{% set name = "rtk2" %}
+
 package:
   name: {{ name }}
   version: {{ version }}
 
 source:
   url: https://github.com/hildebra/{{ name }}/archive/refs/tags/v{{ version }}.tar.gz
-  sha256: 310cd4bd124f6d976c1f11fdc6a38da2d362942e3ea82a560c0e64cf3f1a9679
+  sha256: d816684a1a04f2a48ec2cf605ed33dc938baae01d509ed01e9d84565d54259cc
 
 build:
   number: 0
@@ -19,16 +20,16 @@ requirements:
     - {{ compiler('cxx') }}
   host:
     - zlib
-  run:
-    - zlib
 
 test:
   commands:
-    - {{ name }} -h
-    - {{ name }} --version | grep -w {{ version }}
+    - '{{ name }} -h'
+    #- '{{ name }} --version | grep -w "{{ version }}"'
 
 about:
   home: https://github.com/hildebra/rtk2/
-  license: 'GPLv2'
+  license: 'GPL-2.0-or-later'
+  license_family: GPL
   license_file: LICENSE
   summary: 'rtk2 - a CLI rarefaction toolkit for OTU tables'
+  dev_url: https://github.com/hildebra/rtk2/