diff --git a/orbit/__version__.py b/orbit/__version__.py
index f17f00ec..06365df5 100644
--- a/orbit/__version__.py
+++ b/orbit/__version__.py
@@ -1 +1 @@
-__version__ = "1.1.4.7"
+__version__ = "1.1.4.8"
diff --git a/orbit/utils/stan.py b/orbit/utils/stan.py
index 39a7c912..4f8441c3 100644
--- a/orbit/utils/stan.py
+++ b/orbit/utils/stan.py
@@ -1,4 +1,3 @@
-from datetime import datetime
 import json
 import os
 import platform
@@ -31,12 +30,6 @@
         os.environ["Path"] += ";" + os.path.normpath(os.path.expanduser(path_string))
 
 
-def get_file_time(path: str):
-    return datetime.fromtimestamp(os.path.getmtime(path)).replace(
-        second=0, microsecond=0
-    )
-
-
 def get_compiled_stan_model(
     stan_model_name: str = "",
     stan_file_path: Optional[str] = None,
@@ -78,14 +71,13 @@ def get_compiled_stan_model(
         )
         # Check if exe is older than .stan file.
         # This behavior is default on CmdStanModel if we don't have to specify the exe_file.
-        if not os.path.isfile(exe_file) or (
-            get_file_time(exe_file) <= get_file_time(stan_file)
-        ):
-            force_compile = True
+        # if not os.path.isfile(exe_file) or (
+        #     os.path.getmtime(exe_file) <= os.path.getmtime(stan_file)
+        # ):
 
         if not os.path.isfile(exe_file) or force_compile:
             logger.info(f"Compiling stan model:{stan_file}. ETA 3 - 5 mins.")
-            sm = CmdStanModel(stan_file=stan_file, force_compile=force_compile)
+            sm = CmdStanModel(stan_file=stan_file)
         else:
             sm = CmdStanModel(stan_file=stan_file, exe_file=exe_file)
 
diff --git a/pyproject.toml b/pyproject.toml
index bf140ca1..16b8f860 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.black]
 line-length = 88
-target-version = ['py38', 'py39']
+target-version = ['py39', 'py310']
 include = '\.pyi?$'
 extend-exclude = '''
 # A regex preceded with ^/ will apply only to files and directories
@@ -19,11 +19,11 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "orbit-ml"
 authors = [
-  {name="Edwin Ng", email="edwinnglabs@gmail.com"}, 
+  {name="Edwin Ng"}, 
   {name="Zhishi Wang"}, 
   {name="Steve Yang"}, 
   {name="Yifeng Wu"}, 
-  {name="Jing Pan"}
+  {name="Jing Pan"},
 ]
 maintainers = [
   {name = "Edwin Ng", email = "edwinnglabs@gmail.com"},
@@ -31,27 +31,26 @@ maintainers = [
 dynamic = ["version"]
 description = "Orbit is a package for Bayesian time series modeling and inference."
 readme = "README.md"
-requires-python = ">=3.7"
+requires-python = ">=3.9"
 dependencies = [
-  "arviz",
+  "arviz>=0.17.1",
   "cmdstanpy>=1.2.1",
-  "importlib_resources",
-  "matplotlib>=3.3.2",
-  "numpy>=1.18",
-  "pandas>=1.0.3",
-  "pyro-ppl>=1.4.0",
-  "scipy>=1.4.1",
-  "seaborn>=0.10.0",
-  "statsmodels>=0.11.1",
-  "torch>=1.11.0",
-  "tqdm>=4.36.1",
+  "importlib_resources>=6.4.0",
+  "ipywidgets",
+  "matplotlib>=3.8.3",
+  "numpy>=1.26.4",
+  "pandas>=2.2.1",
+  "pyro-ppl>=1.9.0",
+  "scipy>=1.12.0",
+  "seaborn>=0.13.2",
+  "setuptools>=42",
+  "statsmodels>=0.14.1",
+  "torch>=2.2.1",
+  "tqdm>=4.66.2",
 ]
 license = {text = "Apache License 2.0"}
 classifiers = [
   "Programming Language :: Python",
-  "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.7",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
diff --git a/requirements.txt b/requirements.txt
index 395bdf61..c014307e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,14 +1,14 @@
-arviz
+arviz>=0.17.1
 cmdstanpy>=1.2.1
-importlib_resources
+importlib_resources>=6.4.0
 ipywidgets
-matplotlib>=3.3.2
-numpy>=1.18
-pandas>=1.0.3
-pyro-ppl>=1.4.0
-scipy>=1.4.1
-seaborn>=0.10.0
+matplotlib>=3.8.3
+numpy>=1.26.4
+pandas>=2.2.1
+pyro-ppl>=1.9.0
+scipy>=1.12.0
+seaborn>=0.13.2
 setuptools>=42
-statsmodels>=0.11.1
-torch>=1.11.0
-tqdm>=4.36.1
\ No newline at end of file
+statsmodels>=0.14.1
+torch>=2.2.1
+tqdm>=4.66.2
\ No newline at end of file
diff --git a/setup.py b/setup.py
index ecfcda8b..b6cf80ea 100644
--- a/setup.py
+++ b/setup.py
@@ -2,6 +2,7 @@
 import os
 import platform
 import shutil
+import sys
 from pathlib import Path
 
 from setuptools import find_packages, setup
@@ -65,6 +66,7 @@ def install_stan():
     Reference from prophet
     """
     from multiprocessing import cpu_count
+
     import cmdstanpy
 
     remove_older_cmdstan(CMDSTAN_VERSION)
@@ -93,12 +95,12 @@ def build_model(model: str, model_dir: str):
 
 
 def build_stan_models():
-    for model in MODELS:
-        # note: ensure copy target is a directory not a file.
-        build_model(
-            model=model,
-            model_dir=MODEL_SOURCE_DIR,
-        )
+    if "conda" not in sys.prefix.lower():
+        for model in MODELS:
+            build_model(
+                model=model,
+                model_dir=MODEL_SOURCE_DIR,
+            )
 
 
 class BuildPyCommand(build_py):
@@ -108,7 +110,6 @@ def run(self):
         print("Running build py command.")
         if not self.dry_run:
             print("Not a dry run, run with build")
-            # build_stan_model(target_dir)
 
             # install cmdstan and compilers, in the default directory for simplicity
             install_stan()
@@ -116,7 +117,6 @@ def run(self):
             # build all stan models
             build_stan_models()
 
-        print("Dry run.")
         build_py.run(self)