diff --git a/00_intro_00_lecture.ipynb b/00_intro_00_lecture.ipynb
index a8d2237..e53b008 100644
--- a/00_intro_00_lecture.ipynb
+++ b/00_intro_00_lecture.ipynb
@@ -77,7 +77,7 @@
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
-     "slide_type": "slide"
+     "slide_type": "skip"
     }
    },
    "source": [
@@ -350,7 +350,7 @@
      "name": "stdout",
      "output_type": "stream",
      "text": [
-      "Python 3.7.4\n"
+      "Python 3.7.6\n"
      ]
     }
    ],
@@ -472,7 +472,7 @@
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
-     "slide_type": "slide"
+     "slide_type": "skip"
     }
    },
    "source": [
@@ -673,7 +673,7 @@
    "cell_type": "markdown",
    "metadata": {
     "slideshow": {
-     "slide_type": "slide"
+     "slide_type": "skip"
     }
    },
    "source": [
@@ -903,7 +903,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.6"
   },
   "livereveal": {
    "auto_select": "code",
diff --git a/00_intro_01_review.ipynb b/00_intro_01_review.ipynb
index f08c6ca..325fc74 100644
--- a/00_intro_01_review.ipynb
+++ b/00_intro_01_review.ipynb
@@ -206,7 +206,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.6"
   },
   "toc": {
    "base_numbering": 1,
diff --git a/00_intro_02_exercises.ipynb b/00_intro_02_exercises.ipynb
index 3b394db..b0f53db 100644
--- a/00_intro_02_exercises.ipynb
+++ b/00_intro_02_exercises.ipynb
@@ -94,7 +94,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.6"
   },
   "toc": {
    "base_numbering": 1,