diff --git a/pyproject.toml b/pyproject.toml
index 695450f..cff89a7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -24,7 +24,7 @@ python = "^3.12"
 elasticsearch = "^7"
 requests = "^2.32.3"
 tqdm = "^4.66.6"
-sphinx = "^8.1.3"
+sphinx = "^7"
 directory-tree = { git = "https://github.com/cedadev/ceda-directory-tree.git", tag = "v1.1.3" }
 ceda-elasticsearch-tools = { git = "https://github.com/cedadev/ceda-elasticsearch-tools.git", tag = "v2.4.0" }
 tag-scanner = { git = "https://github.com/cedadev/cci-tag-scanner.git", tag = "v2.1.6" }