diff --git a/requirements/ci/nox.lock/py310-linux-64.lock b/requirements/ci/nox.lock/py310-linux-64.lock
index 9e1752d226..6cea5880aa 100644
--- a/requirements/ci/nox.lock/py310-linux-64.lock
+++ b/requirements/ci/nox.lock/py310-linux-64.lock
@@ -1,6 +1,6 @@
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: bfa9fcb43f27d3b5018bd5ba71014d1bee1c1e8880dc395a23a545da41f7502e
+# input_hash: e755261bf8cb4508d0b291e9efd406c55fdcebf113bdeb4ea14bfccf3f623e56
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
 https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2022.9.24-ha878542_0.tar.bz2#41e4e87062433e283696cf384f952ef6
diff --git a/requirements/ci/nox.lock/py38-linux-64.lock b/requirements/ci/nox.lock/py38-linux-64.lock
index c20d39975a..1cb20c2cce 100644
--- a/requirements/ci/nox.lock/py38-linux-64.lock
+++ b/requirements/ci/nox.lock/py38-linux-64.lock
@@ -1,6 +1,6 @@
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: 8d4c178651c31739fed02e90c04fb28e609ed8ec1090eb336ebcae4c42c72cac
+# input_hash: 0adff1c1aa6a49a3d784fd9be06fb43f1a450cf0f1871db2d38d071ffa6efbcc
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
 https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2022.9.24-ha878542_0.tar.bz2#41e4e87062433e283696cf384f952ef6
diff --git a/requirements/ci/nox.lock/py39-linux-64.lock b/requirements/ci/nox.lock/py39-linux-64.lock
index 011e3122d9..bec758d380 100644
--- a/requirements/ci/nox.lock/py39-linux-64.lock
+++ b/requirements/ci/nox.lock/py39-linux-64.lock
@@ -1,6 +1,6 @@
 # Generated by conda-lock.
 # platform: linux-64
-# input_hash: a9b5e3d7c3c7c340f4ee88d896ba760e53d8dd26d1cb7b8194e4f19b3b2dd8de
+# input_hash: 8a7c28a9309987aef78235650068290b0ecd5ac9e6ab522f4fad962cc9b1fc6c
 @EXPLICIT
 https://conda.anaconda.org/conda-forge/linux-64/_libgcc_mutex-0.1-conda_forge.tar.bz2#d7c89558ba9fa0495403155b64376d81
 https://conda.anaconda.org/conda-forge/linux-64/ca-certificates-2022.9.24-ha878542_0.tar.bz2#41e4e87062433e283696cf384f952ef6
diff --git a/requirements/ci/py310.yml b/requirements/ci/py310.yml
index ae0090881d..87a16ba18a 100644
--- a/requirements/ci/py310.yml
+++ b/requirements/ci/py310.yml
@@ -49,3 +49,7 @@ dependencies:
   - sphinx-gallery >=0.11.0
   - sphinx-panels
   - pydata-sphinx-theme = 0.8.1
+
+# Temporary minimum pins.
+# See https://github.com/SciTools/iris/pull/5051
+  - graphviz >=6.0.0
diff --git a/requirements/ci/py38.yml b/requirements/ci/py38.yml
index c0ed574c92..e2d696d30c 100644
--- a/requirements/ci/py38.yml
+++ b/requirements/ci/py38.yml
@@ -49,3 +49,7 @@ dependencies:
   - sphinx-gallery >=0.11.0
   - sphinx-panels
   - pydata-sphinx-theme = 0.8.1
+
+# Temporary minimum pins.
+# See https://github.com/SciTools/iris/pull/5051
+  - graphviz >=6.0.0
diff --git a/requirements/ci/py39.yml b/requirements/ci/py39.yml
index c79b0ede1d..500ec2f80f 100644
--- a/requirements/ci/py39.yml
+++ b/requirements/ci/py39.yml
@@ -49,3 +49,7 @@ dependencies:
   - sphinx-gallery >=0.11.0
   - sphinx-panels
   - pydata-sphinx-theme = 0.8.1
+
+# Temporary minimum pins.
+# See https://github.com/SciTools/iris/pull/5051
+  - graphviz >=6.0.0