diff --git a/pyproject.toml b/pyproject.toml
index 7f386bd..2811cd7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -18,9 +18,6 @@ classifiers = [
     "Programming Language :: Python :: 3",
 ]
 dependencies = [
-    "geopandas",
-    "h5netcdf",
-    "matplotlib",
     "numpy>=1.7",
     "pandas>=0.15",
     "pyyaml",
@@ -33,6 +30,7 @@ dependencies = [
 "Bug Tracker" = "https://github.com/ClimateImpactLab/impactlab-tools/issues"
 
 [project.optional-dependencies]
+complete = ["impactlab-tools[viz,docs,test]"]
 docs = [
     "Sphinx",
     "sphinx-rtd-theme",
@@ -42,6 +40,10 @@ test = [
     "pytest>=3.0",
     "pytest-cov>=2.0",
 ]
+viz = [
+    "geopandas",
+    "matplotlib",
+]
 
 [tool.pytest.ini_options]
 testpaths = [
diff --git a/requirements.txt b/requirements.txt
index 6668441..086776b 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,9 +1,8 @@
 # This is only used by Github and Github Actions.
 numpy==1.26.3
-xarray==2024.5.0
+xarray[complete]==2024.5.0
 pandas==2.2.1
 scipy==1.13.0
-h5netcdf==1.3.0
 geopandas==0.14.3
 matplotlib==3.8.3
 Sphinx==7.3.7
diff --git a/whatsnew.rst b/whatsnew.rst
index 3de1a91..d8249c9 100644
--- a/whatsnew.rst
+++ b/whatsnew.rst
@@ -6,6 +6,10 @@ These are new features and improvements of note in each release.
 Unreleased
 ----------
 
+ - Drop unused "h5netcdf" dependency. Make "matplotlib", "geopandas" optional dependencies.
+
+ - Add new extras for optional dependencies: ``impactlab-tools[viz]``, ``impactlab-tools[complete]``.
+
  - Minor code cleanup, style update.
 
  - Update ruff lint section format in pyproject.toml