diff --git a/.evergreen/config/generated/build/build-extension.yml b/.evergreen/config/generated/build/build-extension.yml
index 85e25d736..4faf2d114 100644
--- a/.evergreen/config/generated/build/build-extension.yml
+++ b/.evergreen/config/generated/build/build-extension.yml
@@ -9,7 +9,7 @@ tasks:
       - func: "compile extension"
         # TODO: remove once 1.20.0 is released
         vars:
-          EXTENSION_BRANCH: "master"
+          EXTENSION_BRANCH: "v1.20"
       - func: "upload extension"
   # TODO: re-enable once 1.20.0 is released
 #  - name: "build-php-8.3-lowest"
@@ -51,7 +51,7 @@ tasks:
       - func: "compile extension"
         # TODO: remove once 1.20.0 is released
         vars:
-          EXTENSION_BRANCH: "master"
+          EXTENSION_BRANCH: "v1.20"
       - func: "upload extension"
   # TODO: re-enable once 1.20.0 is released
 #  - name: "build-php-8.2-lowest"
@@ -93,7 +93,7 @@ tasks:
       - func: "compile extension"
         # TODO: remove once 1.20.0 is released
         vars:
-          EXTENSION_BRANCH: "master"
+          EXTENSION_BRANCH: "v1.20"
       - func: "upload extension"
   # TODO: re-enable once 1.20.0 is released
 #  - name: "build-php-8.1-lowest"
@@ -135,7 +135,7 @@ tasks:
       - func: "compile extension"
         # TODO: remove once 1.20.0 is released
         vars:
-          EXTENSION_BRANCH: "master"
+          EXTENSION_BRANCH: "v1.20"
       - func: "upload extension"
   # TODO: re-enable once 1.20.0 is released
 #  - name: "build-php-8.0-lowest"
@@ -177,7 +177,7 @@ tasks:
       - func: "compile extension"
         # TODO: remove once 1.20.0 is released
         vars:
-          EXTENSION_BRANCH: "master"
+          EXTENSION_BRANCH: "v1.20"
       - func: "upload extension"
   # TODO: re-enable once 1.20.0 is released
 #  - name: "build-php-7.4-lowest"
diff --git a/.evergreen/config/templates/build/build-extension.yml b/.evergreen/config/templates/build/build-extension.yml
index 5d6d705e1..ecd1fffdd 100644
--- a/.evergreen/config/templates/build/build-extension.yml
+++ b/.evergreen/config/templates/build/build-extension.yml
@@ -7,7 +7,7 @@
       - func: "compile extension"
         # TODO: remove once 1.20.0 is released
         vars:
-          EXTENSION_BRANCH: "master"
+          EXTENSION_BRANCH: "v1.20"
       - func: "upload extension"
   # TODO: re-enable once 1.20.0 is released
 #  - name: "build-php-%phpVersion%-lowest"
diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index 6c0f9d6fe..959e9b500 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -17,7 +17,7 @@ env:
   PHP_VERSION: "8.2"
   # TODO: change to "stable" once 1.20.0 is released
   # DRIVER_VERSION: "stable"
-  DRIVER_VERSION: "mongodb/mongo-php-driver@master"
+  DRIVER_VERSION: "mongodb/mongo-php-driver@v1.20"
 
 jobs:
   phpcs:
diff --git a/.github/workflows/static-analysis.yml b/.github/workflows/static-analysis.yml
index e1ff4495c..23bdd702e 100644
--- a/.github/workflows/static-analysis.yml
+++ b/.github/workflows/static-analysis.yml
@@ -23,7 +23,7 @@ env:
   PHP_VERSION: "8.2"
   # TODO: change to "stable" once 1.20.0 is released
   # DRIVER_VERSION: "stable"
-  DRIVER_VERSION: "mongodb/mongo-php-driver@master"
+  DRIVER_VERSION: "mongodb/mongo-php-driver@v1.20"
 
 jobs:
   psalm:
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b3a8562f5..e5ae92cdc 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -16,7 +16,7 @@ on:
 env:
   # TODO: change to "stable" once 1.20.0 is released
   # DRIVER_VERSION: "stable"
-  DRIVER_VERSION: "mongodb/mongo-php-driver@master"
+  DRIVER_VERSION: "mongodb/mongo-php-driver@v1.20"
 
 jobs:
   phpunit: