diff --git a/tools/github_actions_install.sh b/tools/github_actions_install.sh
index 521e87b7f..be93503f8 100755
--- a/tools/github_actions_install.sh
+++ b/tools/github_actions_install.sh
@@ -8,12 +8,8 @@ if [[ "$SPHINX_VERSION" == "" ]]; then
     SPHINX_INSTALL=""
 elif [[ "$SPHINX_VERSION" == "dev" ]]; then
     SPHINX_INSTALL="git+https://github.com/sphinx-doc/sphinx"
-    if [[ "$1" == "doc" ]]; then
-        # Until they release a new version that undoes the max sphinx pin...
-        DEP_EXTRA="git+https://github.com/executablebooks/MyST-NB"
-    fi
 elif [[ "$SPHINX_VERSION" == "old" ]]; then
-    SPHINX_INSTALL="sphinx==5.0"
+    SPHINX_INSTALL="sphinx==6.1.0"
 else  # not used currently but easy enough
     SPHINX_INSTALL="sphinx==$SPHINX_VERSION"
 fi