diff --git a/exercises/colab01-03.ipynb b/exercises/colab01-03.ipynb
index 3aa7458..458eb8b 100644
--- a/exercises/colab01-03.ipynb
+++ b/exercises/colab01-03.ipynb
@@ -32,7 +32,7 @@
     "\n",
     "# A hack to force the runtime to restart, needed to include the above dependencies.\n",
     "import os\n",
-    "os._exit()"
+    "os._exit(0)"
    ]
   },
   {
diff --git a/exercises/colab04-05.ipynb b/exercises/colab04-05.ipynb
index 8b698c1..de11b38 100644
--- a/exercises/colab04-05.ipynb
+++ b/exercises/colab04-05.ipynb
@@ -27,7 +27,7 @@
     "\n",
     "# A hack to force the runtime to restart, needed to include the above dependencies.\n",
     "import os\n",
-    "os._exit()"
+    "os._exit(0)"
    ]
   },
   {
diff --git a/exercises/colab06-07.ipynb b/exercises/colab06-07.ipynb
index 76f4d2d..81879a2 100644
--- a/exercises/colab06-07.ipynb
+++ b/exercises/colab06-07.ipynb
@@ -22,7 +22,7 @@
     "\n",
     "# A hack to force the runtime to restart, needed to include the above dependencies.\n",
     "import os\n",
-    "os._exit()"
+    "os._exit(0)"
    ]
   },
   {