diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5f18e90..b043dae 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,6 +19,7 @@ if(KALDI_ROOT)
 
 endif()
 add_definitions(-DKALDI_NO_PORTAUDIO=1)
+add_definitions(-DOPENFST_VER=18400)
 if (MSVC)
     find_package(dlfcn-win32 REQUIRED)
     set(CMAKE_DL_LIBS dlfcn-win32::dl)
diff --git a/environment.yml b/environment.yml
index b370b91..8aeed61 100644
--- a/environment.yml
+++ b/environment.yml
@@ -10,7 +10,7 @@ dependencies:
   - kaldi=*=*cpu*
   - scipy
   - pynini
-  - openfst=1.8.3
+  - openfst
   - setuptools_scm
   - pybind11
   - pytest