diff --git a/deploy.sh b/deploy.sh
index f29a4d7..3299d3e 100644
--- a/deploy.sh
+++ b/deploy.sh
@@ -21,17 +21,17 @@ if [ -d output ] && [ -f .head_id ] && diff -q  .head_id .tmp_id; then
 fi
 
 if [ ! -d ./virtenv ]; then
-    python3 -m venv virtenv
+    python3.8 -m venv virtenv
 fi
 
 source virtenv/bin/activate
 
-pip install --upgrade pip
-pip install -r requirements.txt
+pip install --upgrade pip || exit -1
+pip install -r requirements.txt || exit -1
 
 rm -rf output
-nikola build
+nikola build || exit -1
 
-rsync -Pvrt --delete ./output/ $DEST
+rsync -Pvrt --delete ./output/ $DEST || exit -1
 
 mv .tmp_id .head_id