diff --git a/external/PIM-tree b/external/PIM-tree
index 1d8194d..0a92d43 160000
--- a/external/PIM-tree
+++ b/external/PIM-tree
@@ -1 +1 @@
-Subproject commit 1d8194d9f9c478aca9467e0525669ea05f292e7f
+Subproject commit 0a92d439a534f7be0b2682bcc8c197a289ee76b4
diff --git a/scripts/pimtree_input_gen.sh b/scripts/pimtree_input_gen.sh
index 1bc1c40..1268fc6 100755
--- a/scripts/pimtree_input_gen.sh
+++ b/scripts/pimtree_input_gen.sh
@@ -5,6 +5,7 @@ PIM_TREE_DIR="$SCRIPT_DIR/../external/PIM-tree"
 PIM_TREE_BUILD_DIR="$PIM_TREE_DIR/build"
 mkdir -p $INPUT_DIR
 cd $PIM_TREE_DIR
+export PARLAY_NUM_THREADS=1
 
 
 # パラメータは以下の通り