diff --git a/build/conda/conda-3-7-env-full.yaml b/build/conda/conda-3-7-env-full.yaml
index 199a9b2d179..38fa017c354 100644
--- a/build/conda/conda-3-7-env-full.yaml
+++ b/build/conda/conda-3-7-env-full.yaml
@@ -12,3 +12,4 @@ dependencies:
   - jupyter_client=6.1.12
   - pytest
   - black=21.5b2
+  - sphinx=4.1.0
diff --git a/build/conda/conda-3-8-env-full.yaml b/build/conda/conda-3-8-env-full.yaml
index cf6d4c375b5..842973dda72 100644
--- a/build/conda/conda-3-8-env-full.yaml
+++ b/build/conda/conda-3-8-env-full.yaml
@@ -12,3 +12,4 @@ dependencies:
   - jupyter_client=6.1.12
   - pytest
   - black=21.5b2
+  - sphinx=4.1.0
diff --git a/build/conda/conda-3-8-env.yaml b/build/conda/conda-3-8-env.yaml
index 4ef9a3f25ff..31144a0ef13 100644
--- a/build/conda/conda-3-8-env.yaml
+++ b/build/conda/conda-3-8-env.yaml
@@ -10,3 +10,4 @@ dependencies:
   - jupyter_client=6.1.12
   - pytest
   - black=21.5b2
+  - sphinx=4.1.0