diff --git a/day_04/01_numpy.ipynb b/day_04/01_numpy.ipynb
index ac36d65..cf20fd1 100644
--- a/day_04/01_numpy.ipynb
+++ b/day_04/01_numpy.ipynb
@@ -21,7 +21,7 @@
         "colab_type": "text"
       },
       "source": [
-        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/day_04/01_numpy_linear_algebra.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
+        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/main/day_04/01_numpy_linear_algebra.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
       ]
     },
     {
diff --git a/day_04/02_monte_carlo_birthday_simulation.ipynb b/day_04/02_monte_carlo_birthday_simulation.ipynb
index 4284364..ee662fa 100644
--- a/day_04/02_monte_carlo_birthday_simulation.ipynb
+++ b/day_04/02_monte_carlo_birthday_simulation.ipynb
@@ -33,7 +33,7 @@
         "colab_type": "text"
       },
       "source": [
-        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/day_04/day_04/02_monte_carlo_birthday_simulation.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
+        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/main/day_04/02_monte_carlo_birthday_simulation.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
       ]
     },
     {
@@ -357,4 +357,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/day_05/01_list_comprehension.ipynb b/day_05/01_list_comprehension.ipynb
index 6ef4dc2..8a148f6 100644
--- a/day_05/01_list_comprehension.ipynb
+++ b/day_05/01_list_comprehension.ipynb
@@ -22,7 +22,7 @@
         "colab_type": "text"
       },
       "source": [
-        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/day_05/day_05/01_list_comprehension.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
+        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/main/day_05/01_list_comprehension.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
       ]
     },
     {
@@ -868,4 +868,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/day_05/02_dictionaries.ipynb b/day_05/02_dictionaries.ipynb
index e2b38d4..1a613a7 100644
--- a/day_05/02_dictionaries.ipynb
+++ b/day_05/02_dictionaries.ipynb
@@ -21,7 +21,7 @@
         "colab_type": "text"
       },
       "source": [
-        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/day_05/02_dictionaries.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
+        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/main/day_05/02_dictionaries.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
       ]
     },
     {
diff --git a/day_05/03_building_airbnb_scrape.ipynb b/day_05/03_building_airbnb_scrape.ipynb
index cd2b7aa..850debd 100644
--- a/day_05/03_building_airbnb_scrape.ipynb
+++ b/day_05/03_building_airbnb_scrape.ipynb
@@ -21,7 +21,7 @@
         "colab_type": "text"
       },
       "source": [
-        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/day_05/day_05/03_building_airbnb_scrape.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
+        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/main/day_05/03_building_airbnb_scrape.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
       ]
     },
     {
@@ -372,4 +372,4 @@
       ]
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/day_05/04_monte_carlo_bday_assignment.ipynb b/day_05/04_monte_carlo_bday_assignment.ipynb
index 7c2ebc8..47a1897 100644
--- a/day_05/04_monte_carlo_bday_assignment.ipynb
+++ b/day_05/04_monte_carlo_bday_assignment.ipynb
@@ -20,7 +20,7 @@
         "colab_type": "text"
       },
       "source": [
-        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/day_05/day_05/04_monte_carlo_bday_assignment.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
+        "<a href=\"https://colab.research.google.com/github/gumdropsteve/intro_to_python/blob/main/day_05/04_monte_carlo_bday_assignment.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>"
       ]
     },
     {
@@ -85,4 +85,4 @@
       "outputs": []
     }
   ]
-}
\ No newline at end of file
+}