diff --git a/activitysim/cli/create.py b/activitysim/cli/create.py
index ec545d3787..7cd8d218c5 100644
--- a/activitysim/cli/create.py
+++ b/activitysim/cli/create.py
@@ -123,7 +123,7 @@ def get_example(
         Files downloaded via http pointers will be cached in
         this location.  If a path is not given but just a truthy
         value, then a cache directory is created using in a location
-        selected by the appdirs library (or, if not installed,
+        selected by the platformdirs library (or, if not installed,
         linking is skipped.)
     """
     if example_name not in EXAMPLES:
@@ -200,11 +200,11 @@ def download_asset(url, target_path, sha256=None, link=True):
     if link:
         if not isinstance(link, (str, Path)):
             try:
-                import appdirs
+                import platformdirs
             except ImportError:
                 link = False
             else:
-                link = appdirs.user_data_dir("ActivitySim")
+                link = platformdirs.user_data_dir("ActivitySim")
         original_target_path = target_path
         target_path = os.path.join(link, target_path)
     os.makedirs(os.path.dirname(target_path), exist_ok=True)
diff --git a/conda-environments/activitysim-dev-base.yml b/conda-environments/activitysim-dev-base.yml
index f0bdcb3a36..1e63b621db 100644
--- a/conda-environments/activitysim-dev-base.yml
+++ b/conda-environments/activitysim-dev-base.yml
@@ -19,8 +19,8 @@ dependencies:
 - black >= 22.0,<23
 - bump2version  # for making a release
 - coveralls
-- cytoolz >= 0.8.1
-- dask
+- cytoolz = 0.12.*
+- dask = 2023.3.*
 - descartes
 - filelock
 - fsspec
@@ -30,44 +30,45 @@ dependencies:
 - ipykernel  # so this env will appear in jupyter as a selection
 - isort
 - jupyterlab
-- larch >= 5.5.8
+- larch = 5.7.*
 - matplotlib
 - myst-parser  # allows markdown in sphinx
 - nbconvert
 - nbformat
-- numba >= 0.55.2
+- numba = 0.56.*
 - numexpr
-- numpy >= 1.16.1,<=1.21
+- numpy = 1.23.*
 - numpydoc
-- openmatrix >= 0.3.4.1
-- orca >= 1.6
-- pandas >= 1.1.0
+- openmatrix = 0.3.*
+- orca = 1.8
+- pandas = 1.4.*
+- platformdirs = 3.2.*
 - pre-commit
-- psutil >= 4.1
-- pyarrow >= 2.0
+- psutil = 5.9.*
+- pyarrow = 11.*
 - pycodestyle
-- pydantic
+- pydantic = 1.10.*
 - pydata-sphinx-theme
-- pyinstrument
-- pypyr
+- pyinstrument = 4.4
+- pypyr = 5.8.*
 - pytables >=3.5.1,<3.7
-- pytest
+- pytest = 7.2.*
 - pytest-cov
 - pytest-regressions
-- pyyaml >= 5.1
-- requests >= 2.7
-- rich
+- pyyaml = 6.*
+- requests = 2.28.*
+- rich = 13.3.*
 - ruby  # required for benchmarking pre-commit hooks
 - setuptools_scm
-- scikit-learn >= 1.1
+- scikit-learn = 1.2.*
 - simwrapper > 1.7
 - snakeviz  # for profiling
-- sphinx
-- sphinx_rtd_theme
-- sphinx-argparse
-- xarray >= 0.21
+- sphinx = 6.1.*
+- sphinx_rtd_theme = 1.2.*
+- sphinx-argparse = 0.4.*
+- xarray = 2023.2.*
 - xmle
-- zarr
+- zarr = 2.14.*
 
 - pip:
   - autodoc_pydantic
diff --git a/conda-environments/activitysim-dev.yml b/conda-environments/activitysim-dev.yml
index c46b436dea..cac073df65 100644
--- a/conda-environments/activitysim-dev.yml
+++ b/conda-environments/activitysim-dev.yml
@@ -15,8 +15,8 @@ dependencies:
 - black >= 22.0,<23
 - bump2version  # for making a release
 - coveralls
-- cytoolz >= 0.8.1
-- dask
+- cytoolz = 0.12.*
+- dask = 2023.3.*
 - descartes
 - filelock
 - fsspec
@@ -26,46 +26,46 @@ dependencies:
 - ipykernel  # so this env will appear in jupyter as a selection
 - isort
 - jupyterlab
-- larch >= 5.5.8
+- larch = 5.7.*
 - matplotlib
 - myst-parser  # allows markdown in sphinx
 - nbconvert
 - nbformat
-- numba >= 0.56.4
+- numba = 0.56.*
 - numexpr
-- numpy >= 1.16.1
+- numpy = 1.23.*
 - numpydoc
-- openmatrix >= 0.3.4.1
-- orca >= 1.6
-- pandas >= 1.1.0
+- openmatrix = 0.3.*
+- orca = 1.8
+- pandas = 1.4.*
+- platformdirs = 3.2.*
 - pre-commit
-- psutil >= 4.1
-- pyarrow >= 2.0
+- psutil = 5.9.*
+- pyarrow = 11.*
 - pycodestyle
-- pydantic
+- pydantic = 1.10.*
 - pydata-sphinx-theme
-- pyinstrument
-- pypyr
+- pyinstrument = 4.4
+- pypyr = 5.8.*
 - pytables >=3.5.1,<3.7
-- pytest
+- pytest = 7.2.*
 - pytest-cov
 - pytest-regressions
-- pyyaml >= 5.1
-- requests >= 2.7
-- rich
+- pyyaml = 6.*
+- requests = 2.28.*
+- rich = 13.3.*
 - ruby  # required for benchmarking pre-commit hooks
 - setuptools_scm
-- scikit-learn >= 1.1
+- scikit-learn = 1.2.*
 - sharrow >= 2.5.2
 - simwrapper > 1.7
-- scikit-learn >= 1.1.1
 - snakeviz  # for profiling
-- sphinx
-- sphinx_rtd_theme
-- sphinx-argparse
-- xarray >= 0.21
+- sphinx = 6.1.*
+- sphinx_rtd_theme = 1.2.*
+- sphinx-argparse = 0.4.*
+- xarray = 2023.2.*
 - xmle
-- zarr
+- zarr = 2.14.*
 
 - pip:
   - autodoc_pydantic
diff --git a/conda-environments/github-actions-tests.yml b/conda-environments/github-actions-tests.yml
index 63d353ea51..28d6c51f8e 100644
--- a/conda-environments/github-actions-tests.yml
+++ b/conda-environments/github-actions-tests.yml
@@ -9,26 +9,27 @@ dependencies:
 - pip
 - black >= 22.0,<23
 - coveralls
-- cytoolz >= 0.8.1
+- cytoolz = 0.12.*
+- dask = 2023.3.*
 - isort
 - nbmake
-- numba >= 0.56.4
-- numpy >= 1.16.1
-- openmatrix >= 0.3.4.1
-- orca >= 1.6
-- pandas >= 1.1.0
-- psutil >= 4.1
-- pyarrow >= 2.0
-- pypyr >= 5.3
+- numba = 0.56.*
+- numpy = 1.23.*
+- openmatrix = 0.3.*
+- orca = 1.8
+- pandas = 1.4.*
+- platformdirs = 3.2.*
+- psutil = 5.9.*
+- pyarrow = 11.*
+- pypyr = 5.8.*
 - pytables >= 3.5.1,<3.7  # orca's constraint
-- pytest
+- pytest = 7.2.*
 - pytest-cov
 - pytest-regressions
-- pyyaml >= 5.1
-- requests >= 2.7
-- scikit-learn >= 1.1
+- pyyaml = 6.*
+- requests = 2.28.*
+- scikit-learn = 1.2.*
 - sharrow >= 2.5.2
 - simwrapper > 1.7
-- scikit-learn >= 1.1.1
-- xarray >= 0.21
-- zarr
+- xarray = 2023.2.*
+- zarr = 2.14.*
diff --git a/setup.cfg b/setup.cfg
index cb3b413880..b2736a99a6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -29,7 +29,7 @@ install_requires =
     numpy >= 1.16.1
     openmatrix >= 0.3.4.1
     orca >= 1.6
-    pandas >= 1.1.0
+    pandas >= 1.4, <2
     psutil >= 4.1
     pyarrow >= 2.0
     pypyr >= 5.3