diff --git a/.evergreen/config.yml b/.evergreen/config.yml
index e7a8e93ae0..822ccbc015 100644
--- a/.evergreen/config.yml
+++ b/.evergreen/config.yml
@@ -711,6 +711,12 @@ axes:
         display_name: "Rapid"
         variables:
           MONGODB_VERSION: "rapid"
+      # 9.0 is not yet GA. drivers-evergreen-tools resolves this to the latest
+      # nightly build of the server's v9.0 branch (DRIVERS-3610).
+      - id: "9.0"
+        display_name: "9.0"
+        variables:
+          MONGODB_VERSION: "9.0"
       - id: "8.2"
         display_name: "8.2"
         variables:
@@ -886,9 +892,6 @@ axes:
       - id: ubuntu2004
         display_name: "Ubuntu 20.04"
         run_on: ubuntu2004-small
-      - id: ubuntu1804
-        display_name: "Ubuntu 18.04"
-        run_on: ubuntu1804-small
       - id: debian11
         display_name: "Debian 11"
         run_on: debian11-small
@@ -1112,7 +1115,7 @@ buildvariants:
     matrix_spec:
       auth-and-ssl: ["auth-and-ssl", "noauth-and-nossl"]
       ruby: "ruby-4.0"
-      mongodb-version: ["8.2", "8.0", "7.0"]
+      mongodb-version: ["9.0", "8.2", "8.0", "7.0"]
       topology: ["standalone", "replica-set", "sharded-cluster"]
       os: ubuntu2204
     display_name: ${auth-and-ssl} ${ruby} db-${mongodb-version} ${topology}
@@ -1123,7 +1126,7 @@ buildvariants:
   - matrix_name: "mongo-recent"
     matrix_spec:
       ruby: ["ruby-4.0", "ruby-3.4", "ruby-3.3", "ruby-3.2", "jruby-9.4"]
-      mongodb-version: ["8.2", "8.0", "7.0"]
+      mongodb-version: ["9.0", "8.2", "8.0", "7.0"]
       topology: ["standalone", "replica-set", "sharded-cluster"]
       os: ubuntu2204
     display_name: "${mongodb-version} ${os} ${topology} ${auth-and-ssl} ${ruby}"
@@ -1153,12 +1156,16 @@ buildvariants:
     tasks:
       - name: "run-main-test-suite"
 
+  # 20.04 is the newest host usable here: the 4.4 enterprise archive is not
+  # published for ubuntu2204. It is also the oldest that still works, since
+  # drivers-evergreen-tools now requires uv, which needs Python 3.8+ (18.04
+  # ships 3.6).
   - matrix_name: "mongo-4.x"
     matrix_spec:
       ruby: ["ruby-3.0", "ruby-2.7"]
       mongodb-version: ['4.4']
       topology: ["standalone", "replica-set", "sharded-cluster"]
-      os: ubuntu1804
+      os: ubuntu2004
     display_name: "${mongodb-version} ${topology} ${auth-and-ssl} ${ruby}"
     tags: ["pr"]
     tasks:
@@ -1285,7 +1292,7 @@ buildvariants:
       ruby: "ruby-2.7"
       mongodb-version: ['4.4']
       topology: replica-set
-      os: ubuntu1804
+      os: ubuntu2004
     display_name: "${mongodb-version} ${topology} stress ${ruby}"
     tasks:
       - name: "test"
@@ -1294,7 +1301,7 @@ buildvariants:
     matrix_spec:
       stress: on
       ruby: "ruby-4.0"
-      mongodb-version: ["8.2", "8.0", "7.0"]
+      mongodb-version: ["9.0", "8.2", "8.0", "7.0"]
       topology: replica-set
       os: ubuntu2204
     display_name: "${mongodb-version} ${topology} stress ${ruby}"
diff --git a/.evergreen/config/axes.yml.erb b/.evergreen/config/axes.yml.erb
index 9b305d1570..34a73b9847 100644
--- a/.evergreen/config/axes.yml.erb
+++ b/.evergreen/config/axes.yml.erb
@@ -6,6 +6,12 @@ axes:
         display_name: "Rapid"
         variables:
           MONGODB_VERSION: "rapid"
+      # 9.0 is not yet GA. drivers-evergreen-tools resolves this to the latest
+      # nightly build of the server's v9.0 branch (DRIVERS-3610).
+      - id: "9.0"
+        display_name: "9.0"
+        variables:
+          MONGODB_VERSION: "9.0"
       - id: "8.2"
         display_name: "8.2"
         variables:
@@ -181,9 +187,6 @@ axes:
       - id: ubuntu2004
         display_name: "Ubuntu 20.04"
         run_on: ubuntu2004-small
-      - id: ubuntu1804
-        display_name: "Ubuntu 18.04"
-        run_on: ubuntu1804-small
       - id: debian11
         display_name: "Debian 11"
         run_on: debian11-small
diff --git a/.evergreen/config/standard.yml.erb b/.evergreen/config/standard.yml.erb
index ea1c3d019c..6f50473d59 100644
--- a/.evergreen/config/standard.yml.erb
+++ b/.evergreen/config/standard.yml.erb
@@ -32,7 +32,7 @@
 
   stable_and_rapid = [ latest_stable_mdb_raw, "rapid" ]
 
-  recent_mdb = %w( 8.2 8.0 7.0 )
+  recent_mdb = %w( 9.0 8.2 8.0 7.0 )
 %>
 
 buildvariants:
@@ -106,12 +106,16 @@ buildvariants:
     tasks:
       - name: "run-main-test-suite"
 
+  # 20.04 is the newest host usable here: the 4.4 enterprise archive is not
+  # published for ubuntu2204. It is also the oldest that still works, since
+  # drivers-evergreen-tools now requires uv, which needs Python 3.8+ (18.04
+  # ships 3.6).
   - matrix_name: "mongo-4.x"
     matrix_spec:
       ruby: <%= older_rubies %>
       mongodb-version: ['4.4']
       topology: <%= topologies %>
-      os: ubuntu1804
+      os: ubuntu2004
     display_name: "${mongodb-version} ${topology} ${auth-and-ssl} ${ruby}"
     tags: ["pr"]
     tasks:
@@ -238,7 +242,7 @@ buildvariants:
       ruby: <%= supported_mri_ruby_2 %>
       mongodb-version: ['4.4']
       topology: replica-set
-      os: ubuntu1804
+      os: ubuntu2004
     display_name: "${mongodb-version} ${topology} stress ${ruby}"
     tasks:
       - name: "test"
diff --git a/.mod/drivers-evergreen-tools b/.mod/drivers-evergreen-tools
index 18aed4f176..890a93bdb8 160000
--- a/.mod/drivers-evergreen-tools
+++ b/.mod/drivers-evergreen-tools
@@ -1 +1 @@
-Subproject commit 18aed4f176dab1ed505c9a2a53466ddf3f4796ec
+Subproject commit 890a93bdb88c595907813a9bfd0a56156d9f9f5b