diff --git a/.readthedocs.yaml b/.readthedocs.yaml
index 550591cc..8c18d70c 100644
--- a/.readthedocs.yaml
+++ b/.readthedocs.yaml
@@ -7,6 +7,7 @@ build:
   jobs:
     post_install:
     - conda env list
+    - conda list
     - which python
     - which conda
     - julia install_julia_packages.jl  # https://docs.readthedocs.io/en/stable/config-file/v2.html  # https://github.com/readthedocs/readthedocs.org/issues/1740
diff --git a/docs/environment.yml b/docs/environment.yml
index 875954d0..21e65490 100644
--- a/docs/environment.yml
+++ b/docs/environment.yml
@@ -20,7 +20,7 @@ dependencies:
   - sphinx!=4.4.0
   - sphinxcontrib-napoleon
   - sphinx-copybutton
-  - sphinx-book-theme
+  - sphinx-book-theme>=0.1.7
   - myst-nb
   - pip
   - pip:
diff --git a/environment.yml b/environment.yml
index ea32ef46..8a475f7d 100644
--- a/environment.yml
+++ b/environment.yml
@@ -29,6 +29,6 @@ dependencies:
   - myst-nb
   - pip
   - pip:
-    - git+https://github.com/zarr-developers/numcodecs
+    - numcodecs
     - pytest-lazy-fixture
     - -e .
diff --git a/requirements.txt b/requirements.txt
index fabf5d73..2f8e1e5f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
 xarray
 julia
 tqdm
-numcodecs @ git+https://github.com/zarr-developers/numcodecs
+numcodecs>=0.10.0