diff --git a/ci/environment-docs.yml b/ci/environment-docs.yml
index b63763a7..1a6c561d 100644
--- a/ci/environment-docs.yml
+++ b/ci/environment-docs.yml
@@ -12,6 +12,7 @@ dependencies:
   - jupyterlab
   - matplotlib
   - myst-nb
+  - netcdf4<1.6
   - pip
   - pydantic>=1.9
   - python-graphviz
diff --git a/ci/environment-upstream-dev.yml b/ci/environment-upstream-dev.yml
index 53f32b3f..49ae67e2 100644
--- a/ci/environment-upstream-dev.yml
+++ b/ci/environment-upstream-dev.yml
@@ -12,7 +12,7 @@ dependencies:
   - h5netcdf>=0.8.1
   - ipython
   - matplotlib
-  - netcdf4>=1.5.5
+  - netcdf4>=1.5.5,<1.6
   - pandas
   - pip
   - pooch
diff --git a/ci/environment.yml b/ci/environment.yml
index 295b0cbe..b537918d 100644
--- a/ci/environment.yml
+++ b/ci/environment.yml
@@ -12,7 +12,7 @@ dependencies:
   - intake>=0.6.6
   - ipython
   - matplotlib
-  - netcdf4>=1.5.5
+  - netcdf4>=1.5.5,<1.6
   - pip
   - pooch
   - pre-commit
diff --git a/requirements.txt b/requirements.txt
index cda50acd..755588b1 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,7 +2,7 @@ dask[complete]>=2022.02.0
 fastprogress>=1.0.0
 fsspec>=2022.7.0
 intake>=0.6.6
-netCDF4>=1.5.5
+netCDF4>=1.5.5,<1.6
 requests>=2.24.0
 xarray>=2022.06
 zarr>=2.12
diff --git a/tests/sample_data/kerchunk-files/noaa-nwm-test-reference.json b/tests/sample_data/kerchunk-files/noaa-nwm-test-reference.json
index 65064c1c..d1029dce 100644
--- a/tests/sample_data/kerchunk-files/noaa-nwm-test-reference.json
+++ b/tests/sample_data/kerchunk-files/noaa-nwm-test-reference.json
@@ -12,153 +12,153 @@
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