diff --git a/cmake/modules/pyproject.toml.in b/cmake/modules/pyproject.toml.in
index 090b2d4b0c..085ddf4179 100644
--- a/cmake/modules/pyproject.toml.in
+++ b/cmake/modules/pyproject.toml.in
@@ -9,7 +9,7 @@ name = "@module_name_toml@"
 sip-module = "@sip_name@"
 sip-include-dirs = @sip_include_dirs@
 sip-files-dir = "@module_srcs@"
-abi-version = "12"
+abi-version = "12.8"
 
 [tool.sip.bindings.@module_name_toml@]
 tags = @module_tags@