diff --git a/recipe/bld.bat b/recipe/bld.bat
index 6118240..72d44bb 100644
--- a/recipe/bld.bat
+++ b/recipe/bld.bat
@@ -1,6 +1,7 @@
 @echo on
 
 set "KALDI_ROOT=%LIBRARY_PREFIX:\=/%"
+set "CMAKE_BUILD_PARALLEL_LEVEL=1"
 
 %PYTHON% -m pip install . --no-deps -vv
 if %ERRORLEVEL% neq 0 exit 1
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index ec13743..588b2dd 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -1,5 +1,5 @@
 {% set name = "kalpy" %}
-{% set version = "0.6.0" %}
+{% set version = "0.6.1" %}
 
 package:
   name: kalpy
@@ -7,7 +7,7 @@ package:
 
 source:
   url: https://pypi.io/packages/source/k/kalpy-kaldi/kalpy-kaldi-{{ version }}.tar.gz
-  sha256: a4de4c0245fdb4cee12cec22ce152bf425f1455815d88419344dd91e5b1f3a32
+  sha256: 4bb06f63506ec11155dd717b7dc248ae9ae4283fe052dc51ad0a51dc821f9d18
 
 build:
   number: 0
@@ -29,14 +29,16 @@ requirements:
     - python
     - pip
     - kaldi >=5.5.1068
-    - openfst
-    - pynini
+    - openfst ==1.8.2
+    - pynini ==2.1.5
   run:
     - python
     - dataclassy
     - numpy
     - librosa
     - praatio
+    - openfst ==1.8.2
+    - pynini ==2.1.5
 
 test:
   requires: