diff --git a/.evergreen/config_generator/components/earthly.py b/.evergreen/config_generator/components/earthly.py
index debf6dd39a..d9bfb95f6f 100644
--- a/.evergreen/config_generator/components/earthly.py
+++ b/.evergreen/config_generator/components/earthly.py
@@ -47,7 +47,7 @@
 "Valid options for the SASL configuration parameter"
 TLSOption = Literal["OpenSSL", "off"]
 "Options for the TLS backend configuration parameter (AKA 'ENABLE_SSL')"
-CxxVersion = Literal["none"]  # TODO: Once CXX-3103 is released, add latest C++ release tag.
+CxxVersion = Literal["master", "r4.1.0", "none"]
 "C++ driver refs that are under CI test"
 
 # A separator character, since we cannot use whitespace
@@ -179,8 +179,8 @@ def task_filter(env: EarthlyVariant, conf: Configuration) -> bool:
     configuration values.
     """
     match env, conf:
-        # u16/centos7 are not capable of building mongocxx
-        case e, (_sasl, _tls, cxx) if re.match(r"^Ubuntu 16|^CentOS 7", e.display_name):
+        # u16/u18/centos7 are not capable of building mongocxx
+        case e, (_sasl, _tls, cxx) if re.match(r"^Ubuntu 16|^Ubuntu 18|^CentOS 7", e.display_name):
             # Only build if C++ driver is test is disabled
             return cxx == "none"
         # Anything else: Allow it to run:
diff --git a/.evergreen/generated_configs/tasks.yml b/.evergreen/generated_configs/tasks.yml
index 8188744a0b..082f406d0a 100644
--- a/.evergreen/generated_configs/tasks.yml
+++ b/.evergreen/generated_configs/tasks.yml
@@ -1124,6 +1124,49 @@ tasks:
   - name: check-headers
     commands:
       - func: check-headers
+  - name: "check:sasl=Cyrus\_\u2022\_tls=OpenSSL\_\u2022\_test_mongocxx_ref=master"
+    run_on:
+      - amazon2
+      - debian11-large
+      - debian12-large
+      - ubuntu2204-large
+      - ubuntu2404-large
+    tags: [earthly, pr-merge-gate, alpine3.16-clang, alpine3.16-gcc, alpine3.17-clang, alpine3.17-gcc, alpine3.18-clang, alpine3.18-gcc, alpine3.19-clang, alpine3.19-gcc, archlinux-clang, archlinux-gcc, u20-clang, u20-gcc, u22-clang, u22-gcc]
+    commands:
+      - func: docker-login-amazon-ecr
+      - command: subprocess.exec
+        type: setup
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +env-warmup
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --sasl=Cyrus
+            - --tls=OpenSSL
+            - --test_mongocxx_ref=master
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+      - command: subprocess.exec
+        type: test
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +run
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --targets=test-example test-cxx-driver
+            - --sasl=Cyrus
+            - --tls=OpenSSL
+            - --test_mongocxx_ref=master
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
   - name: "check:sasl=Cyrus\_\u2022\_tls=OpenSSL\_\u2022\_test_mongocxx_ref=none"
     run_on:
       - amazon2
@@ -1167,6 +1210,92 @@ tasks:
             - --test_mongocxx_ref=none
             - --env=${MONGOC_EARTHLY_ENV}
             - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+  - name: "check:sasl=Cyrus\_\u2022\_tls=OpenSSL\_\u2022\_test_mongocxx_ref=r4.1.0"
+    run_on:
+      - amazon2
+      - debian11-large
+      - debian12-large
+      - ubuntu2204-large
+      - ubuntu2404-large
+    tags: [earthly, pr-merge-gate, alpine3.16-clang, alpine3.16-gcc, alpine3.17-clang, alpine3.17-gcc, alpine3.18-clang, alpine3.18-gcc, alpine3.19-clang, alpine3.19-gcc, archlinux-clang, archlinux-gcc, u20-clang, u20-gcc, u22-clang, u22-gcc]
+    commands:
+      - func: docker-login-amazon-ecr
+      - command: subprocess.exec
+        type: setup
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +env-warmup
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --sasl=Cyrus
+            - --tls=OpenSSL
+            - --test_mongocxx_ref=r4.1.0
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+      - command: subprocess.exec
+        type: test
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +run
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --targets=test-example test-cxx-driver
+            - --sasl=Cyrus
+            - --tls=OpenSSL
+            - --test_mongocxx_ref=r4.1.0
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+  - name: "check:sasl=Cyrus\_\u2022\_tls=off\_\u2022\_test_mongocxx_ref=master"
+    run_on:
+      - amazon2
+      - debian11-large
+      - debian12-large
+      - ubuntu2204-large
+      - ubuntu2404-large
+    tags: [earthly, pr-merge-gate, alpine3.16-clang, alpine3.16-gcc, alpine3.17-clang, alpine3.17-gcc, alpine3.18-clang, alpine3.18-gcc, alpine3.19-clang, alpine3.19-gcc, archlinux-clang, archlinux-gcc, u20-clang, u20-gcc, u22-clang, u22-gcc]
+    commands:
+      - func: docker-login-amazon-ecr
+      - command: subprocess.exec
+        type: setup
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +env-warmup
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --sasl=Cyrus
+            - --tls=off
+            - --test_mongocxx_ref=master
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+      - command: subprocess.exec
+        type: test
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +run
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --targets=test-example test-cxx-driver
+            - --sasl=Cyrus
+            - --tls=off
+            - --test_mongocxx_ref=master
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
   - name: "check:sasl=Cyrus\_\u2022\_tls=off\_\u2022\_test_mongocxx_ref=none"
     run_on:
       - amazon2
@@ -1210,6 +1339,92 @@ tasks:
             - --test_mongocxx_ref=none
             - --env=${MONGOC_EARTHLY_ENV}
             - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+  - name: "check:sasl=Cyrus\_\u2022\_tls=off\_\u2022\_test_mongocxx_ref=r4.1.0"
+    run_on:
+      - amazon2
+      - debian11-large
+      - debian12-large
+      - ubuntu2204-large
+      - ubuntu2404-large
+    tags: [earthly, pr-merge-gate, alpine3.16-clang, alpine3.16-gcc, alpine3.17-clang, alpine3.17-gcc, alpine3.18-clang, alpine3.18-gcc, alpine3.19-clang, alpine3.19-gcc, archlinux-clang, archlinux-gcc, u20-clang, u20-gcc, u22-clang, u22-gcc]
+    commands:
+      - func: docker-login-amazon-ecr
+      - command: subprocess.exec
+        type: setup
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +env-warmup
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --sasl=Cyrus
+            - --tls=off
+            - --test_mongocxx_ref=r4.1.0
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+      - command: subprocess.exec
+        type: test
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +run
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --targets=test-example test-cxx-driver
+            - --sasl=Cyrus
+            - --tls=off
+            - --test_mongocxx_ref=r4.1.0
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+  - name: "check:sasl=off\_\u2022\_tls=OpenSSL\_\u2022\_test_mongocxx_ref=master"
+    run_on:
+      - amazon2
+      - debian11-large
+      - debian12-large
+      - ubuntu2204-large
+      - ubuntu2404-large
+    tags: [earthly, pr-merge-gate, alpine3.16-clang, alpine3.16-gcc, alpine3.17-clang, alpine3.17-gcc, alpine3.18-clang, alpine3.18-gcc, alpine3.19-clang, alpine3.19-gcc, archlinux-clang, archlinux-gcc, u20-clang, u20-gcc, u22-clang, u22-gcc]
+    commands:
+      - func: docker-login-amazon-ecr
+      - command: subprocess.exec
+        type: setup
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +env-warmup
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --sasl=off
+            - --tls=OpenSSL
+            - --test_mongocxx_ref=master
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+      - command: subprocess.exec
+        type: test
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +run
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --targets=test-example test-cxx-driver
+            - --sasl=off
+            - --tls=OpenSSL
+            - --test_mongocxx_ref=master
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
   - name: "check:sasl=off\_\u2022\_tls=OpenSSL\_\u2022\_test_mongocxx_ref=none"
     run_on:
       - amazon2
@@ -1253,6 +1468,92 @@ tasks:
             - --test_mongocxx_ref=none
             - --env=${MONGOC_EARTHLY_ENV}
             - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+  - name: "check:sasl=off\_\u2022\_tls=OpenSSL\_\u2022\_test_mongocxx_ref=r4.1.0"
+    run_on:
+      - amazon2
+      - debian11-large
+      - debian12-large
+      - ubuntu2204-large
+      - ubuntu2404-large
+    tags: [earthly, pr-merge-gate, alpine3.16-clang, alpine3.16-gcc, alpine3.17-clang, alpine3.17-gcc, alpine3.18-clang, alpine3.18-gcc, alpine3.19-clang, alpine3.19-gcc, archlinux-clang, archlinux-gcc, u20-clang, u20-gcc, u22-clang, u22-gcc]
+    commands:
+      - func: docker-login-amazon-ecr
+      - command: subprocess.exec
+        type: setup
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +env-warmup
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --sasl=off
+            - --tls=OpenSSL
+            - --test_mongocxx_ref=r4.1.0
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+      - command: subprocess.exec
+        type: test
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +run
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --targets=test-example test-cxx-driver
+            - --sasl=off
+            - --tls=OpenSSL
+            - --test_mongocxx_ref=r4.1.0
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+  - name: "check:sasl=off\_\u2022\_tls=off\_\u2022\_test_mongocxx_ref=master"
+    run_on:
+      - amazon2
+      - debian11-large
+      - debian12-large
+      - ubuntu2204-large
+      - ubuntu2404-large
+    tags: [earthly, pr-merge-gate, alpine3.16-clang, alpine3.16-gcc, alpine3.17-clang, alpine3.17-gcc, alpine3.18-clang, alpine3.18-gcc, alpine3.19-clang, alpine3.19-gcc, archlinux-clang, archlinux-gcc, u20-clang, u20-gcc, u22-clang, u22-gcc]
+    commands:
+      - func: docker-login-amazon-ecr
+      - command: subprocess.exec
+        type: setup
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +env-warmup
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --sasl=off
+            - --tls=off
+            - --test_mongocxx_ref=master
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+      - command: subprocess.exec
+        type: test
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +run
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --targets=test-example test-cxx-driver
+            - --sasl=off
+            - --tls=off
+            - --test_mongocxx_ref=master
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
   - name: "check:sasl=off\_\u2022\_tls=off\_\u2022\_test_mongocxx_ref=none"
     run_on:
       - amazon2
@@ -1296,6 +1597,49 @@ tasks:
             - --test_mongocxx_ref=none
             - --env=${MONGOC_EARTHLY_ENV}
             - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+  - name: "check:sasl=off\_\u2022\_tls=off\_\u2022\_test_mongocxx_ref=r4.1.0"
+    run_on:
+      - amazon2
+      - debian11-large
+      - debian12-large
+      - ubuntu2204-large
+      - ubuntu2404-large
+    tags: [earthly, pr-merge-gate, alpine3.16-clang, alpine3.16-gcc, alpine3.17-clang, alpine3.17-gcc, alpine3.18-clang, alpine3.18-gcc, alpine3.19-clang, alpine3.19-gcc, archlinux-clang, archlinux-gcc, u20-clang, u20-gcc, u22-clang, u22-gcc]
+    commands:
+      - func: docker-login-amazon-ecr
+      - command: subprocess.exec
+        type: setup
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +env-warmup
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --sasl=off
+            - --tls=off
+            - --test_mongocxx_ref=r4.1.0
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
+      - command: subprocess.exec
+        type: test
+        params:
+          binary: ./tools/earthly.sh
+          working_dir: mongoc
+          include_expansions_in_env:
+            - DOCKER_CONFIG
+          args:
+            - --buildkit-image=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub/earthly/buildkitd:v0.8.3
+            - +run
+            - --default_search_registry=901841024863.dkr.ecr.us-east-1.amazonaws.com/dockerhub
+            - --targets=test-example test-cxx-driver
+            - --sasl=off
+            - --tls=off
+            - --test_mongocxx_ref=r4.1.0
+            - --env=${MONGOC_EARTHLY_ENV}
+            - --c_compiler=${MONGOC_EARTHLY_C_COMPILER}
   - name: clang-format
     tags: [clang-format]
     commands: