diff --git a/docs/conf.py b/docs/conf.py
index 6ca49d3..ddcdbc8 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -49,6 +49,10 @@
 # Location of word list.
 spelling_word_list_filename = "spelling_wordlist.txt"
 
+# The documentation does not include contributor names, so we skip this because it's
+# flaky about needing to scan commit history.
+spelling_ignore_contributor_names = False
+
 # Doctest configuration.
 doctest_global_setup = "from webcolors import *"
 doctest_default_flags = (
diff --git a/noxfile.py b/noxfile.py
index 388fd14..b4e8a71 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -106,6 +106,8 @@ def tests_definitions(session: nox.Session) -> None:
     Run the full color definitions test suite (requires an internet connection).
 
     """
+    if IS_CI:
+        session.skip("Release tests do not run in CI.")
     session.install("pytest", "bs4", "html5lib", "requests", ".[tests]")
     session.run(f"python{session.python}", "-I", "tests/definitions.py")
     clean()
@@ -117,6 +119,8 @@ def tests_full_colors(session: nox.Session) -> None:
     Run the full color conversion test suite (slow/CPU-intensive).
 
     """
+    if IS_CI:
+        session.skip("Release tests do not run in CI.")
     session.install(".[tests]")
     session.run(f"python{session.python}", "-I", "tests/full_colors.py")
     clean()
@@ -385,6 +389,8 @@ def package_manifest(session: nox.Session) -> None:
     Check that the set of files in the package matches the set under version control.
 
     """
+    if IS_CI:
+        session.skip("check-manifest already run by earlier CI steps.")
     session.install("check-manifest")
     session.run(f"python{session.python}", "-Im", "check_manifest", "--version")
     session.run(f"python{session.python}", "-Im", "check_manifest", "--verbose")