diff --git a/.buildconfig b/.buildconfig
index 0a7e1430..2f197940 100644
--- a/.buildconfig
+++ b/.buildconfig
@@ -1,2 +1,2 @@
 PG_VERSION=16.4
-SDK_VERSION=3.1.66.1bi
+SDK_VERSION=3.1.65.15bi
diff --git a/cibuild.sh b/cibuild.sh
index 10b77994..e0d226e9 100755
--- a/cibuild.sh
+++ b/cibuild.sh
@@ -200,7 +200,7 @@ END
 
     else
         export PGDEBUG=""
-        export CDEBUG="-g0 -O0"
+        export CDEBUG="-g0 -O2"
         cat > ${PG_DEBUG_HEADER} << END
 #ifndef I_PGDEBUG
 #define I_PGDEBUG