diff --git a/.evergreen/config/generated/build/build-libmongoc.yml b/.evergreen/config/generated/build/build-libmongoc.yml
index 7149f612e..0b46a7da2 100644
--- a/.evergreen/config/generated/build/build-libmongoc.yml
+++ b/.evergreen/config/generated/build/build-libmongoc.yml
@@ -12,7 +12,7 @@ tasks:
       - func: "compile driver"
         vars:
           PHP_VERSION: "8.4"
-          LIBMONGOC_VERSION: "2.0.2"
+          LIBMONGOC_VERSION: "2.1.0"
       - func: "upload build"
 
   - name: "build-php-8.4-libmongoc-next-stable"
@@ -21,7 +21,7 @@ tasks:
       - func: "compile driver"
         vars:
           PHP_VERSION: "8.4"
-          LIBMONGOC_VERSION: "r2.0"
+          LIBMONGOC_VERSION: "r2.1"
       - func: "upload build"
 
   - name: "build-php-8.4-libmongoc-latest"
diff --git a/.evergreen/config/templates/build/build-libmongoc.yml b/.evergreen/config/templates/build/build-libmongoc.yml
index 7134dd55a..22166a90b 100644
--- a/.evergreen/config/templates/build/build-libmongoc.yml
+++ b/.evergreen/config/templates/build/build-libmongoc.yml
@@ -10,7 +10,7 @@
       - func: "compile driver"
         vars:
           PHP_VERSION: "%phpVersion%"
-          LIBMONGOC_VERSION: "2.0.2"
+          LIBMONGOC_VERSION: "2.1.0"
       - func: "upload build"
 
   - name: "build-php-%phpVersion%-libmongoc-next-stable"
@@ -19,7 +19,7 @@
       - func: "compile driver"
         vars:
           PHP_VERSION: "%phpVersion%"
-          LIBMONGOC_VERSION: "r2.0"
+          LIBMONGOC_VERSION: "r2.1"
       - func: "upload build"
 
   - name: "build-php-%phpVersion%-libmongoc-latest"
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 004d150ef..d21757f6d 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -134,8 +134,10 @@ jobs:
     runs-on: "ubuntu-latest"
     env:
       PHP_VERSION: "8.3"
-      LIBMONGOCRYPT_VERSION: "1.14"
-      LIBMONGOC_VERSION: "2.0.2"
+      # Note: omit the patch version when referring to the libmongocrypt package
+      LIBMONGOCRYPT_VERSION: "1.15"
+      # Note: include the patch version when referring to a libmongoc release tarball
+      LIBMONGOC_VERSION: "2.1.0"
       SERVER_VERSION: "8.0"
 
     steps:
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a726d5212..add302781 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -272,6 +272,12 @@ against two additional versions of libmongoc:
   `r2.x` branch)
 - The upcoming minor release of libmongoc (e.g. the `master` branch)
 
+#### Update tested system library versions in GitHub Actions
+
+GitHub Actions tests against libmongoc and libmongocrypt system libraries. When
+updating the version number for each dependency in `config.m4` you must also
+update environment variables for the `test-system-libs` job in `tests.yml`.
+
 #### Update sources in PECL package generation script
 
 If a new version of a submodule introduces a new source directory, that may also
diff --git a/bin/prep-release.php b/bin/prep-release.php
index 4d10e97f9..991bf27e8 100644
--- a/bin/prep-release.php
+++ b/bin/prep-release.php
@@ -65,8 +65,8 @@ function get_files() {
         "src/libmongocrypt-compat/mongocrypt/*.{c,h}",
         "src/libmongocrypt/src/*.{c,h,h.in}",
         "src/libmongocrypt/src/crypto/*.{c,h}",
-        // Note: src/libmongocrypt/src/mlib/ does not contain source files (as of libmongocrypt 1.14.0)
-        "src/libmongocrypt/src/mlib/*.h",
+        // Note: src/libmongocrypt/src/mc-mlib/ does not contain source files (as of libmongocrypt 1.14.0)
+        "src/libmongocrypt/src/mc-mlib/*.h",
         "src/libmongocrypt/src/os_posix/*.{c,h}",
         "src/libmongocrypt/src/os_win/*.{c,h}",
         "src/libmongocrypt/src/unicode/*.{c,h}",
diff --git a/config.m4 b/config.m4
index b2a182d32..734385a77 100644
--- a/config.m4
+++ b/config.m4
@@ -242,7 +242,7 @@ if test "$PHP_MONGODB" != "no"; then
   PHP_MONGODB_MONGOCRYPT_VERSION_STRING="None"
 
   if test "$PHP_MONGODB_SYSTEM_LIBS" != "no"; then
-    PKG_CHECK_MODULES([PHP_MONGODB_BSON], [bson2 >= 2.0.2], [
+    PKG_CHECK_MODULES([PHP_MONGODB_BSON], [bson2 >= 2.1.0], [
       PHP_MONGODB_BSON_VERSION=`$PKG_CONFIG bson2 --modversion`
       PHP_MONGODB_BSON_VERSION_STRING="System ($PHP_MONGODB_BSON_VERSION)"
 
@@ -250,10 +250,10 @@ if test "$PHP_MONGODB" != "no"; then
       PHP_EVAL_LIBLINE($PHP_MONGODB_BSON_LIBS, MONGODB_SHARED_LIBADD)
       AC_DEFINE(HAVE_SYSTEM_LIBBSON, 1, [Use system libbson])
     ],[
-      AC_MSG_ERROR([Could not find system library for libbson >= 2.0.2])
+      AC_MSG_ERROR([Could not find system library for libbson >= 2.1.0])
     ])
 
-    PKG_CHECK_MODULES([PHP_MONGODB_MONGOC], [mongoc2 >= 2.0.2], [
+    PKG_CHECK_MODULES([PHP_MONGODB_MONGOC], [mongoc2 >= 2.1.0], [
       PHP_MONGODB_MONGOC_VERSION=`$PKG_CONFIG mongoc2 --modversion`
       PHP_MONGODB_MONGOC_VERSION_STRING="System ($PHP_MONGODB_MONGOC_VERSION)"
 
@@ -261,11 +261,11 @@ if test "$PHP_MONGODB" != "no"; then
       PHP_EVAL_LIBLINE($PHP_MONGODB_MONGOC_LIBS, MONGODB_SHARED_LIBADD)
       AC_DEFINE(HAVE_SYSTEM_LIBMONGOC, 1, [Use system libmongoc])
     ],[
-      AC_MSG_ERROR(Could not find system library for libmongoc >= 2.0.2)
+      AC_MSG_ERROR(Could not find system library for libmongoc >= 2.1.0)
     ])
 
     if test "$PHP_MONGODB_CLIENT_SIDE_ENCRYPTION" != "no"; then
-      PKG_CHECK_MODULES([PHP_MONGODB_MONGOCRYPT], [libmongocrypt >= 1.14.1], [
+      PKG_CHECK_MODULES([PHP_MONGODB_MONGOCRYPT], [libmongocrypt >= 1.15.2], [
         PHP_MONGODB_MONGOCRYPT_VERSION=`$PKG_CONFIG libmongocrypt --modversion`
         PHP_MONGODB_MONGOCRYPT_VERSION_STRING="System ($PHP_MONGODB_MONGOCRYPT_VERSION)"
 
@@ -273,7 +273,7 @@ if test "$PHP_MONGODB" != "no"; then
         PHP_EVAL_LIBLINE($PHP_MONGODB_MONGOCRYPT_LIBS, MONGODB_SHARED_LIBADD)
         AC_DEFINE(HAVE_SYSTEM_LIBMONGOCRYPT, 1, [Use system libmongocrypt])
       ],[
-        AC_MSG_ERROR(Could not find system library for libmongocrypt >= 1.14.1)
+        AC_MSG_ERROR(Could not find system library for libmongocrypt >= 1.15.2)
       ])
     fi
   fi
@@ -358,9 +358,9 @@ if test "$PHP_MONGODB" != "no"; then
     dnl Sources below are updated by scripts/update-submodule-sources.php
     PHP_MONGODB_COMMON_SOURCES="common-atomic.c common-b64.c common-json.c common-md5.c common-oid.c common-string.c common-thread.c"
     PHP_MONGODB_KMS_MESSAGE_SOURCES="hexlify.c kms_azure_request.c kms_b64.c kms_caller_identity_request.c kms_crypto_apple.c kms_crypto_libcrypto.c kms_crypto_none.c kms_crypto_windows.c kms_decrypt_request.c kms_encrypt_request.c kms_gcp_request.c kms_kmip_reader_writer.c kms_kmip_request.c kms_kmip_response.c kms_kmip_response_parser.c kms_kv_list.c kms_message.c kms_port.c kms_request.c kms_request_opt.c kms_request_str.c kms_response.c kms_response_parser.c sort.c"
-    PHP_MONGODB_BSON_SOURCES="bcon.c bson.c bson-clock.c bson-context.c bson-decimal128.c bson-error.c bson-iso8601.c bson-iter.c bson-json.c bson-keys.c bson-memory.c bson-oid.c bson-reader.c bson-string.c bson-timegm.c bson-utf8.c bson-value.c bson-vector.c bson-version-functions.c bson-writer.c validate.c"
+    PHP_MONGODB_BSON_SOURCES="bson-bcon.c bson.c bson-clock.c bson-context.c bson-decimal128.c bson-iso8601.c bson-iter.c bson-json.c bson-keys.c bson-oid.c bson-reader.c bson-string.c bson-timegm.c bson-utf8.c bson-value.c bson-vector.c bson-version-functions.c bson-writer.c error.c memory.c validate.c"
     PHP_MONGODB_JSONSL_SOURCES="jsonsl.c"
-    PHP_MONGODB_MONGOC_SOURCES="mcd-azure.c mcd-nsinfo.c mcd-rpc.c mongoc-aggregate.c mongoc-apm.c mongoc-array.c mongoc-async.c mongoc-async-cmd.c mongoc-buffer.c mongoc-bulk-operation.c mongoc-bulkwrite.c mongoc-change-stream.c mongoc-client.c mongoc-client-pool.c mongoc-client-session.c mongoc-client-side-encryption.c mongoc-cluster-aws.c mongoc-cluster.c mongoc-cluster-cyrus.c mongoc-cluster-sasl.c mongoc-cluster-sspi.c mongoc-cmd.c mongoc-collection.c mongoc-compression.c mongoc-counters.c mongoc-crypt.c mongoc-crypto.c mongoc-crypto-cng.c mongoc-crypto-common-crypto.c mongoc-crypto-openssl.c mongoc-cursor-array.c mongoc-cursor.c mongoc-cursor-change-stream.c mongoc-cursor-cmd.c mongoc-cursor-cmd-deprecated.c mongoc-cursor-find.c mongoc-cursor-find-cmd.c mongoc-cursor-find-opquery.c mongoc-cursor-legacy.c mongoc-cyrus.c mongoc-database.c mongoc-deprioritized-servers.c mongoc-error.c mongoc-find-and-modify.c mongoc-flags.c mongoc-generation-map.c mongoc-gridfs-bucket.c mongoc-gridfs-bucket-file.c mongoc-gridfs.c mongoc-gridfs-file.c mongoc-gridfs-file-list.c mongoc-gridfs-file-page.c mongoc-handshake.c mongoc-host-list.c mongoc-http.c mongoc-init.c mongoc-interrupt.c mongoc-linux-distro-scanner.c mongoc-list.c mongoc-log-and-monitor-private.c mongoc-log.c mongoc-memcmp.c mongoc-ocsp-cache.c mongoc-opcode.c mongoc-openssl.c mongoc-optional.c mongoc-opts.c mongoc-opts-helpers.c mongoc-queue.c mongoc-rand-cng.c mongoc-rand-common-crypto.c mongoc-rand-openssl.c mongoc-read-concern.c mongoc-read-prefs.c mongoc-rpc.c mongoc-sasl.c mongoc-scram.c mongoc-secure-channel.c mongoc-secure-transport.c mongoc-server-api.c mongoc-server-description.c mongoc-server-monitor.c mongoc-server-stream.c mongoc-set.c mongoc-shared.c mongoc-socket.c mongoc-ssl.c mongoc-sspi.c mongoc-stream-buffered.c mongoc-stream.c mongoc-stream-file.c mongoc-stream-gridfs.c mongoc-stream-gridfs-download.c mongoc-stream-gridfs-upload.c mongoc-stream-socket.c mongoc-stream-tls.c mongoc-stream-tls-openssl-bio.c mongoc-stream-tls-openssl.c mongoc-stream-tls-secure-channel.c mongoc-stream-tls-secure-transport.c mongoc-structured-log.c mongoc-timeout.c mongoc-topology-background-monitoring.c mongoc-topology.c mongoc-topology-description-apm.c mongoc-topology-description.c mongoc-topology-scanner.c mongoc-ts-pool.c mongoc-uri.c mongoc-util.c mongoc-version-functions.c mongoc-write-command.c mongoc-write-concern.c service-gcp.c"
+    PHP_MONGODB_MONGOC_SOURCES="mcd-azure.c mcd-nsinfo.c mcd-rpc.c mongoc-aggregate.c mongoc-apm.c mongoc-array.c mongoc-async.c mongoc-async-cmd.c mongoc-buffer.c mongoc-bulk-operation.c mongoc-bulkwrite.c mongoc-change-stream.c mongoc-client.c mongoc-client-pool.c mongoc-client-session.c mongoc-client-side-encryption.c mongoc-cluster-aws.c mongoc-cluster.c mongoc-cluster-cyrus.c mongoc-cluster-sasl.c mongoc-cluster-sspi.c mongoc-cmd.c mongoc-collection.c mongoc-compression.c mongoc-counters.c mongoc-crypt.c mongoc-crypto.c mongoc-crypto-cng.c mongoc-crypto-common-crypto.c mongoc-crypto-openssl.c mongoc-cursor-array.c mongoc-cursor.c mongoc-cursor-change-stream.c mongoc-cursor-cmd.c mongoc-cursor-cmd-deprecated.c mongoc-cursor-find.c mongoc-cursor-find-cmd.c mongoc-cursor-find-opquery.c mongoc-cursor-legacy.c mongoc-cyrus.c mongoc-database.c mongoc-deprioritized-servers.c mongoc-error.c mongoc-find-and-modify.c mongoc-flags.c mongoc-generation-map.c mongoc-gridfs-bucket.c mongoc-gridfs-bucket-file.c mongoc-gridfs.c mongoc-gridfs-file.c mongoc-gridfs-file-list.c mongoc-gridfs-file-page.c mongoc-handshake.c mongoc-host-list.c mongoc-http.c mongoc-init.c mongoc-interrupt.c mongoc-linux-distro-scanner.c mongoc-list.c mongoc-log-and-monitor-private.c mongoc-log.c mongoc-memcmp.c mongoc-ocsp-cache.c mongoc-oidc-callback.c mongoc-oidc-env.c mongoc-opcode.c mongoc-openssl.c mongoc-optional.c mongoc-opts.c mongoc-opts-helpers.c mongoc-queue.c mongoc-rand-cng.c mongoc-rand-common-crypto.c mongoc-rand-openssl.c mongoc-read-concern.c mongoc-read-prefs.c mongoc-rpc.c mongoc-sasl.c mongoc-scram.c mongoc-secure-channel.c mongoc-secure-transport.c mongoc-server-api.c mongoc-server-description.c mongoc-server-monitor.c mongoc-server-stream.c mongoc-set.c mongoc-shared.c mongoc-socket.c mongoc-ssl.c mongoc-sspi.c mongoc-stream-buffered.c mongoc-stream.c mongoc-stream-file.c mongoc-stream-gridfs.c mongoc-stream-gridfs-download.c mongoc-stream-gridfs-upload.c mongoc-stream-socket.c mongoc-stream-tls.c mongoc-stream-tls-openssl-bio.c mongoc-stream-tls-openssl.c mongoc-stream-tls-secure-channel.c mongoc-stream-tls-secure-transport.c mongoc-structured-log.c mongoc-timeout.c mongoc-topology-background-monitoring.c mongoc-topology.c mongoc-topology-description-apm.c mongoc-topology-description.c mongoc-topology-scanner.c mongoc-ts-pool.c mongoc-uri.c mongoc-util.c mongoc-version-functions.c mongoc-write-command.c mongoc-write-concern.c service-gcp.c"
     PHP_MONGODB_UTF8PROC_SOURCES="utf8proc.c"
     PHP_MONGODB_ZLIB_SOURCES="adler32.c compress.c crc32.c deflate.c gzclose.c gzlib.c gzread.c gzwrite.c infback.c inffast.c inflate.c inftrees.c trees.c uncompr.c zutil.c"
 
@@ -394,8 +394,8 @@ if test "$PHP_MONGODB" != "no"; then
 
     AC_CONFIG_FILES([
       ${ac_config_dir}/src/libmongoc/src/common/src/common-config.h
-      ${ac_config_dir}/src/libmongoc/src/libbson/src/bson/bson-config.h
-      ${ac_config_dir}/src/libmongoc/src/libbson/src/bson/bson-version.h
+      ${ac_config_dir}/src/libmongoc/src/libbson/src/bson/config.h
+      ${ac_config_dir}/src/libmongoc/src/libbson/src/bson/version.h
       ${ac_config_dir}/src/libmongoc/src/libmongoc/src/mongoc/mongoc-config.h
       ${ac_config_dir}/src/libmongoc/src/libmongoc/src/mongoc/mongoc-version.h
     ])
@@ -425,7 +425,7 @@ if test "$PHP_MONGODB" != "no"; then
       AC_SUBST(MONGOCRYPT_ENABLE_TRACE, 1)
 
       dnl Sources below are updated by scripts/update-submodule-sources.php
-      PHP_MONGODB_MONGOCRYPT_SOURCES="mc-array.c mc-efc.c mc-fle2-encryption-placeholder.c mc-fle2-find-equality-payload.c mc-fle2-find-equality-payload-v2.c mc-fle2-find-range-payload.c mc-fle2-find-range-payload-v2.c mc-fle2-find-text-payload.c mc-fle2-insert-update-payload.c mc-fle2-insert-update-payload-v2.c mc-fle2-payload-iev.c mc-fle2-payload-iev-v2.c mc-fle2-payload-uev.c mc-fle2-payload-uev-common.c mc-fle2-payload-uev-v2.c mc-fle2-rfds.c mc-fle2-tag-and-encrypted-metadata-block.c mc-parse-utils.c mc-range-edge-generation.c mc-range-encoding.c mc-range-mincover.c mc-rangeopts.c mc-reader.c mc-schema-broker.c mc-str-encode-string-sets.c mc-text-search-str-encode.c mc-tokens.c mc-writer.c mongocrypt-binary.c mongocrypt-buffer.c mongocrypt.c mongocrypt-cache.c mongocrypt-cache-collinfo.c mongocrypt-cache-key.c mongocrypt-cache-oauth.c mongocrypt-ciphertext.c mongocrypt-crypto.c mongocrypt-ctx.c mongocrypt-ctx-datakey.c mongocrypt-ctx-decrypt.c mongocrypt-ctx-encrypt.c mongocrypt-ctx-rewrap-many-datakey.c mongocrypt-endpoint.c mongocrypt-kek.c mongocrypt-key-broker.c mongocrypt-key.c mongocrypt-kms-ctx.c mongocrypt-log.c mongocrypt-marking.c mongocrypt-opts.c mongocrypt-status.c mongocrypt-traverse-util.c mongocrypt-util.c"
+      PHP_MONGODB_MONGOCRYPT_SOURCES="mc-array.c mc-efc.c mc-fle2-encryption-placeholder.c mc-fle2-find-equality-payload.c mc-fle2-find-equality-payload-v2.c mc-fle2-find-range-payload.c mc-fle2-find-range-payload-v2.c mc-fle2-find-text-payload.c mc-fle2-insert-update-payload.c mc-fle2-insert-update-payload-v2.c mc-fle2-payload-iev.c mc-fle2-payload-iev-v2.c mc-fle2-payload-uev.c mc-fle2-payload-uev-common.c mc-fle2-payload-uev-v2.c mc-fle2-rfds.c mc-fle2-tag-and-encrypted-metadata-block.c mc-parse-utils.c mc-range-edge-generation.c mc-range-encoding.c mc-range-mincover.c mc-rangeopts.c mc-reader.c mc-schema-broker.c mc-str-encode-string-sets.c mc-textopts.c mc-text-search-str-encode.c mc-tokens.c mc-writer.c mongocrypt-binary.c mongocrypt-buffer.c mongocrypt.c mongocrypt-cache.c mongocrypt-cache-collinfo.c mongocrypt-cache-key.c mongocrypt-cache-oauth.c mongocrypt-ciphertext.c mongocrypt-crypto.c mongocrypt-ctx.c mongocrypt-ctx-datakey.c mongocrypt-ctx-decrypt.c mongocrypt-ctx-encrypt.c mongocrypt-ctx-rewrap-many-datakey.c mongocrypt-endpoint.c mongocrypt-kek.c mongocrypt-key-broker.c mongocrypt-key.c mongocrypt-kms-ctx.c mongocrypt-log.c mongocrypt-marking.c mongocrypt-opts.c mongocrypt-status.c mongocrypt-traverse-util.c mongocrypt-util.c"
       PHP_MONGODB_MONGOCRYPT_CRYPTO_SOURCES="cng.c commoncrypto.c libcrypto.c none.c"
       PHP_MONGODB_MONGOCRYPT_OS_POSIX_SOURCES="os_dll.c os_mutex.c"
       PHP_MONGODB_MONGOCRYPT_OS_WIN_SOURCES="os_dll.c os_mutex.c"
diff --git a/config.w32 b/config.w32
index 66979ce95..0cd54b228 100644
--- a/config.w32
+++ b/config.w32
@@ -109,9 +109,9 @@ if (PHP_MONGODB != "no") {
   // Sources below are updated by scripts/update-submodule-sources.php
   var PHP_MONGODB_COMMON_SOURCES="common-atomic.c common-b64.c common-json.c common-md5.c common-oid.c common-string.c common-thread.c"
   var PHP_MONGODB_KMS_MESSAGE_SOURCES="hexlify.c kms_azure_request.c kms_b64.c kms_caller_identity_request.c kms_crypto_apple.c kms_crypto_libcrypto.c kms_crypto_none.c kms_crypto_windows.c kms_decrypt_request.c kms_encrypt_request.c kms_gcp_request.c kms_kmip_reader_writer.c kms_kmip_request.c kms_kmip_response.c kms_kmip_response_parser.c kms_kv_list.c kms_message.c kms_port.c kms_request.c kms_request_opt.c kms_request_str.c kms_response.c kms_response_parser.c sort.c";
-  var PHP_MONGODB_BSON_SOURCES="bcon.c bson.c bson-clock.c bson-context.c bson-decimal128.c bson-error.c bson-iso8601.c bson-iter.c bson-json.c bson-keys.c bson-memory.c bson-oid.c bson-reader.c bson-string.c bson-timegm.c bson-utf8.c bson-value.c bson-vector.c bson-version-functions.c bson-writer.c validate.c";
+  var PHP_MONGODB_BSON_SOURCES="bson-bcon.c bson.c bson-clock.c bson-context.c bson-decimal128.c bson-iso8601.c bson-iter.c bson-json.c bson-keys.c bson-oid.c bson-reader.c bson-string.c bson-timegm.c bson-utf8.c bson-value.c bson-vector.c bson-version-functions.c bson-writer.c error.c memory.c validate.c";
   var PHP_MONGODB_JSONSL_SOURCES="jsonsl.c";
-  var PHP_MONGODB_MONGOC_SOURCES="mcd-azure.c mcd-nsinfo.c mcd-rpc.c mongoc-aggregate.c mongoc-apm.c mongoc-array.c mongoc-async.c mongoc-async-cmd.c mongoc-buffer.c mongoc-bulk-operation.c mongoc-bulkwrite.c mongoc-change-stream.c mongoc-client.c mongoc-client-pool.c mongoc-client-session.c mongoc-client-side-encryption.c mongoc-cluster-aws.c mongoc-cluster.c mongoc-cluster-cyrus.c mongoc-cluster-sasl.c mongoc-cluster-sspi.c mongoc-cmd.c mongoc-collection.c mongoc-compression.c mongoc-counters.c mongoc-crypt.c mongoc-crypto.c mongoc-crypto-cng.c mongoc-crypto-common-crypto.c mongoc-crypto-openssl.c mongoc-cursor-array.c mongoc-cursor.c mongoc-cursor-change-stream.c mongoc-cursor-cmd.c mongoc-cursor-cmd-deprecated.c mongoc-cursor-find.c mongoc-cursor-find-cmd.c mongoc-cursor-find-opquery.c mongoc-cursor-legacy.c mongoc-cyrus.c mongoc-database.c mongoc-deprioritized-servers.c mongoc-error.c mongoc-find-and-modify.c mongoc-flags.c mongoc-generation-map.c mongoc-gridfs-bucket.c mongoc-gridfs-bucket-file.c mongoc-gridfs.c mongoc-gridfs-file.c mongoc-gridfs-file-list.c mongoc-gridfs-file-page.c mongoc-handshake.c mongoc-host-list.c mongoc-http.c mongoc-init.c mongoc-interrupt.c mongoc-linux-distro-scanner.c mongoc-list.c mongoc-log-and-monitor-private.c mongoc-log.c mongoc-memcmp.c mongoc-ocsp-cache.c mongoc-opcode.c mongoc-openssl.c mongoc-optional.c mongoc-opts.c mongoc-opts-helpers.c mongoc-queue.c mongoc-rand-cng.c mongoc-rand-common-crypto.c mongoc-rand-openssl.c mongoc-read-concern.c mongoc-read-prefs.c mongoc-rpc.c mongoc-sasl.c mongoc-scram.c mongoc-secure-channel.c mongoc-secure-transport.c mongoc-server-api.c mongoc-server-description.c mongoc-server-monitor.c mongoc-server-stream.c mongoc-set.c mongoc-shared.c mongoc-socket.c mongoc-ssl.c mongoc-sspi.c mongoc-stream-buffered.c mongoc-stream.c mongoc-stream-file.c mongoc-stream-gridfs.c mongoc-stream-gridfs-download.c mongoc-stream-gridfs-upload.c mongoc-stream-socket.c mongoc-stream-tls.c mongoc-stream-tls-openssl-bio.c mongoc-stream-tls-openssl.c mongoc-stream-tls-secure-channel.c mongoc-stream-tls-secure-transport.c mongoc-structured-log.c mongoc-timeout.c mongoc-topology-background-monitoring.c mongoc-topology.c mongoc-topology-description-apm.c mongoc-topology-description.c mongoc-topology-scanner.c mongoc-ts-pool.c mongoc-uri.c mongoc-util.c mongoc-version-functions.c mongoc-write-command.c mongoc-write-concern.c service-gcp.c";
+  var PHP_MONGODB_MONGOC_SOURCES="mcd-azure.c mcd-nsinfo.c mcd-rpc.c mongoc-aggregate.c mongoc-apm.c mongoc-array.c mongoc-async.c mongoc-async-cmd.c mongoc-buffer.c mongoc-bulk-operation.c mongoc-bulkwrite.c mongoc-change-stream.c mongoc-client.c mongoc-client-pool.c mongoc-client-session.c mongoc-client-side-encryption.c mongoc-cluster-aws.c mongoc-cluster.c mongoc-cluster-cyrus.c mongoc-cluster-sasl.c mongoc-cluster-sspi.c mongoc-cmd.c mongoc-collection.c mongoc-compression.c mongoc-counters.c mongoc-crypt.c mongoc-crypto.c mongoc-crypto-cng.c mongoc-crypto-common-crypto.c mongoc-crypto-openssl.c mongoc-cursor-array.c mongoc-cursor.c mongoc-cursor-change-stream.c mongoc-cursor-cmd.c mongoc-cursor-cmd-deprecated.c mongoc-cursor-find.c mongoc-cursor-find-cmd.c mongoc-cursor-find-opquery.c mongoc-cursor-legacy.c mongoc-cyrus.c mongoc-database.c mongoc-deprioritized-servers.c mongoc-error.c mongoc-find-and-modify.c mongoc-flags.c mongoc-generation-map.c mongoc-gridfs-bucket.c mongoc-gridfs-bucket-file.c mongoc-gridfs.c mongoc-gridfs-file.c mongoc-gridfs-file-list.c mongoc-gridfs-file-page.c mongoc-handshake.c mongoc-host-list.c mongoc-http.c mongoc-init.c mongoc-interrupt.c mongoc-linux-distro-scanner.c mongoc-list.c mongoc-log-and-monitor-private.c mongoc-log.c mongoc-memcmp.c mongoc-ocsp-cache.c mongoc-oidc-callback.c mongoc-oidc-env.c mongoc-opcode.c mongoc-openssl.c mongoc-optional.c mongoc-opts.c mongoc-opts-helpers.c mongoc-queue.c mongoc-rand-cng.c mongoc-rand-common-crypto.c mongoc-rand-openssl.c mongoc-read-concern.c mongoc-read-prefs.c mongoc-rpc.c mongoc-sasl.c mongoc-scram.c mongoc-secure-channel.c mongoc-secure-transport.c mongoc-server-api.c mongoc-server-description.c mongoc-server-monitor.c mongoc-server-stream.c mongoc-set.c mongoc-shared.c mongoc-socket.c mongoc-ssl.c mongoc-sspi.c mongoc-stream-buffered.c mongoc-stream.c mongoc-stream-file.c mongoc-stream-gridfs.c mongoc-stream-gridfs-download.c mongoc-stream-gridfs-upload.c mongoc-stream-socket.c mongoc-stream-tls.c mongoc-stream-tls-openssl-bio.c mongoc-stream-tls-openssl.c mongoc-stream-tls-secure-channel.c mongoc-stream-tls-secure-transport.c mongoc-structured-log.c mongoc-timeout.c mongoc-topology-background-monitoring.c mongoc-topology.c mongoc-topology-description-apm.c mongoc-topology-description.c mongoc-topology-scanner.c mongoc-ts-pool.c mongoc-uri.c mongoc-util.c mongoc-version-functions.c mongoc-write-command.c mongoc-write-concern.c service-gcp.c";
   var PHP_MONGODB_UTF8PROC_SOURCES="utf8proc.c";
 
   EXTENSION("mongodb", "php_phongo.c", null, PHP_MONGODB_CFLAGS);
@@ -142,14 +142,14 @@ if (PHP_MONGODB != "no") {
   };
 
   mongodb_generate_header(
-    configure_module_dirname + "/src/libmongoc/src/libbson/src/bson/bson-config.h.in",
-    configure_module_dirname + "/src/libmongoc/src/libbson/src/bson/bson-config.h",
+    configure_module_dirname + "/src/libmongoc/src/libbson/src/bson/config.h.in",
+    configure_module_dirname + "/src/libmongoc/src/libbson/src/bson/config.h",
     bson_opts
   );
 
   mongodb_generate_header(
-    configure_module_dirname + "/src/libmongoc/src/libbson/src/bson/bson-version.h.in",
-    configure_module_dirname + "/src/libmongoc/src/libbson/src/bson/bson-version.h",
+    configure_module_dirname + "/src/libmongoc/src/libbson/src/bson/version.h.in",
+    configure_module_dirname + "/src/libmongoc/src/libbson/src/bson/version.h",
     mongodb_parse_libmongoc_version_file("libbson_")
   );
 
@@ -280,7 +280,7 @@ if (PHP_MONGODB != "no") {
     };
 
     // Sources below are updated by scripts/update-submodule-sources.php
-    var PHP_MONGODB_MONGOCRYPT_SOURCES="mc-array.c mc-efc.c mc-fle2-encryption-placeholder.c mc-fle2-find-equality-payload.c mc-fle2-find-equality-payload-v2.c mc-fle2-find-range-payload.c mc-fle2-find-range-payload-v2.c mc-fle2-find-text-payload.c mc-fle2-insert-update-payload.c mc-fle2-insert-update-payload-v2.c mc-fle2-payload-iev.c mc-fle2-payload-iev-v2.c mc-fle2-payload-uev.c mc-fle2-payload-uev-common.c mc-fle2-payload-uev-v2.c mc-fle2-rfds.c mc-fle2-tag-and-encrypted-metadata-block.c mc-parse-utils.c mc-range-edge-generation.c mc-range-encoding.c mc-range-mincover.c mc-rangeopts.c mc-reader.c mc-schema-broker.c mc-str-encode-string-sets.c mc-text-search-str-encode.c mc-tokens.c mc-writer.c mongocrypt-binary.c mongocrypt-buffer.c mongocrypt.c mongocrypt-cache.c mongocrypt-cache-collinfo.c mongocrypt-cache-key.c mongocrypt-cache-oauth.c mongocrypt-ciphertext.c mongocrypt-crypto.c mongocrypt-ctx.c mongocrypt-ctx-datakey.c mongocrypt-ctx-decrypt.c mongocrypt-ctx-encrypt.c mongocrypt-ctx-rewrap-many-datakey.c mongocrypt-endpoint.c mongocrypt-kek.c mongocrypt-key-broker.c mongocrypt-key.c mongocrypt-kms-ctx.c mongocrypt-log.c mongocrypt-marking.c mongocrypt-opts.c mongocrypt-status.c mongocrypt-traverse-util.c mongocrypt-util.c";
+    var PHP_MONGODB_MONGOCRYPT_SOURCES="mc-array.c mc-efc.c mc-fle2-encryption-placeholder.c mc-fle2-find-equality-payload.c mc-fle2-find-equality-payload-v2.c mc-fle2-find-range-payload.c mc-fle2-find-range-payload-v2.c mc-fle2-find-text-payload.c mc-fle2-insert-update-payload.c mc-fle2-insert-update-payload-v2.c mc-fle2-payload-iev.c mc-fle2-payload-iev-v2.c mc-fle2-payload-uev.c mc-fle2-payload-uev-common.c mc-fle2-payload-uev-v2.c mc-fle2-rfds.c mc-fle2-tag-and-encrypted-metadata-block.c mc-parse-utils.c mc-range-edge-generation.c mc-range-encoding.c mc-range-mincover.c mc-rangeopts.c mc-reader.c mc-schema-broker.c mc-str-encode-string-sets.c mc-textopts.c mc-text-search-str-encode.c mc-tokens.c mc-writer.c mongocrypt-binary.c mongocrypt-buffer.c mongocrypt.c mongocrypt-cache.c mongocrypt-cache-collinfo.c mongocrypt-cache-key.c mongocrypt-cache-oauth.c mongocrypt-ciphertext.c mongocrypt-crypto.c mongocrypt-ctx.c mongocrypt-ctx-datakey.c mongocrypt-ctx-decrypt.c mongocrypt-ctx-encrypt.c mongocrypt-ctx-rewrap-many-datakey.c mongocrypt-endpoint.c mongocrypt-kek.c mongocrypt-key-broker.c mongocrypt-key.c mongocrypt-kms-ctx.c mongocrypt-log.c mongocrypt-marking.c mongocrypt-opts.c mongocrypt-status.c mongocrypt-traverse-util.c mongocrypt-util.c";
     var PHP_MONGODB_MONGOCRYPT_CRYPTO_SOURCES="cng.c commoncrypto.c libcrypto.c none.c";
     var PHP_MONGODB_MONGOCRYPT_OS_POSIX_SOURCES="os_dll.c os_mutex.c";
     var PHP_MONGODB_MONGOCRYPT_OS_WIN_SOURCES="os_dll.c os_mutex.c";
diff --git a/sbom.json b/sbom.json
index 9511e26d4..4631af45a 100644
--- a/sbom.json
+++ b/sbom.json
@@ -1,52 +1,52 @@
 {
   "components": [
     {
-      "bom-ref": "pkg:github/mongodb/libmongocrypt@1.14.1",
+      "bom-ref": "pkg:github/mongodb/libmongocrypt@1.15.2",
       "externalReferences": [
         {
           "type": "distribution",
-          "url": "https://github.com/mongodb/libmongocrypt/archive/refs/tags/1.14.1.tar.gz"
+          "url": "https://github.com/mongodb/libmongocrypt/archive/refs/tags/1.15.2.tar.gz"
         },
         {
           "type": "website",
-          "url": "https://github.com/mongodb/libmongocrypt/tree/1.14.1"
+          "url": "https://github.com/mongodb/libmongocrypt/tree/1.15.2"
         }
       ],
       "group": "mongodb",
       "name": "libmongocrypt",
-      "purl": "pkg:github/mongodb/libmongocrypt@1.14.1",
+      "purl": "pkg:github/mongodb/libmongocrypt@1.15.2",
       "type": "library",
-      "version": "1.14.1"
+      "version": "1.15.2"
     },
     {
-      "bom-ref": "pkg:github/mongodb/mongo-c-driver@2.0.2",
+      "bom-ref": "pkg:github/mongodb/mongo-c-driver@2.1.0",
       "externalReferences": [
         {
           "type": "distribution",
-          "url": "https://github.com/mongodb/mongo-c-driver/archive/refs/tags/2.0.2.tar.gz"
+          "url": "https://github.com/mongodb/mongo-c-driver/archive/refs/tags/2.1.0.tar.gz"
         },
         {
           "type": "website",
-          "url": "https://github.com/mongodb/mongo-c-driver/tree/2.0.2"
+          "url": "https://github.com/mongodb/mongo-c-driver/tree/2.1.0"
         }
       ],
       "group": "mongodb",
       "name": "mongo-c-driver",
-      "purl": "pkg:github/mongodb/mongo-c-driver@2.0.2",
+      "purl": "pkg:github/mongodb/mongo-c-driver@2.1.0",
       "type": "library",
-      "version": "2.0.2"
+      "version": "2.1.0"
     }
   ],
   "dependencies": [
     {
-      "ref": "pkg:github/mongodb/libmongocrypt@1.14.1"
+      "ref": "pkg:github/mongodb/libmongocrypt@1.15.2"
     },
     {
-      "ref": "pkg:github/mongodb/mongo-c-driver@2.0.2"
+      "ref": "pkg:github/mongodb/mongo-c-driver@2.1.0"
     }
   ],
   "metadata": {
-    "timestamp": "2025-06-11T06:47:48.667004+00:00",
+    "timestamp": "2025-09-15T20:36:45.534916+00:00",
     "tools": [
       {
         "externalReferences": [
@@ -90,7 +90,7 @@
     ]
   },
   "serialNumber": "urn:uuid:acb30d08-ee47-4ff0-b301-d66ef1f54082",
-  "version": 15,
+  "version": 17,
   "$schema": "http://cyclonedx.org/schema/bom-1.5.schema.json",
   "bomFormat": "CycloneDX",
   "specVersion": "1.5",
diff --git a/src/LIBMONGOCRYPT_VERSION_CURRENT b/src/LIBMONGOCRYPT_VERSION_CURRENT
index 63e799cf4..42cf0675c 100644
--- a/src/LIBMONGOCRYPT_VERSION_CURRENT
+++ b/src/LIBMONGOCRYPT_VERSION_CURRENT
@@ -1 +1 @@
-1.14.1
+1.15.2
diff --git a/src/libmongoc b/src/libmongoc
index d94ed7a50..163250d2c 160000
--- a/src/libmongoc
+++ b/src/libmongoc
@@ -1 +1 @@
-Subproject commit d94ed7a504c227fa8a69d979abff485174f3cf5d
+Subproject commit 163250d2cc81c532a6315f6ad7e01bf35da9401d
diff --git a/src/libmongocrypt b/src/libmongocrypt
index a8c334585..2807bca63 160000
--- a/src/libmongocrypt
+++ b/src/libmongocrypt
@@ -1 +1 @@
-Subproject commit a8c33458519cff204f6140578f34bbbeb550e0e6
+Subproject commit 2807bca63631a5b6b8affcb7f4402e351166659e
diff --git a/tests/manager/manager-ctor-006.phpt b/tests/manager/manager-ctor-006.phpt
index dc24fe322..7a48f1f83 100644
--- a/tests/manager/manager-ctor-006.phpt
+++ b/tests/manager/manager-ctor-006.phpt
@@ -12,7 +12,7 @@ echo throws(function() {
 ?>
 ===DONE===
 <?php exit(0); ?>
---EXPECT--
+--EXPECTF--
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
-Failed to parse MongoDB URI: 'invalid'. Invalid URI Schema, expecting 'mongodb://' or 'mongodb+srv://'.
+Failed to parse MongoDB URI: 'invalid'. Invalid URI%s
 ===DONE===
diff --git a/tests/manager/manager-ctor_error-002.phpt b/tests/manager/manager-ctor_error-002.phpt
index 7afa84a55..e7f23bcaf 100644
--- a/tests/manager/manager-ctor_error-002.phpt
+++ b/tests/manager/manager-ctor_error-002.phpt
@@ -12,7 +12,7 @@ echo throws(function() {
 ?>
 ===DONE===
 <?php exit(0); ?>
---EXPECT--
+--EXPECTF--
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
-Failed to parse MongoDB URI: 'not a valid connection string'. Invalid URI Schema, expecting 'mongodb://' or 'mongodb+srv://'.
+Failed to parse MongoDB URI: 'not a valid connection string'. Invalid URI%s
 ===DONE===
diff --git a/tests/manager/manager-ctor_error-004.phpt b/tests/manager/manager-ctor_error-004.phpt
index a2f8c778c..140afaced 100644
--- a/tests/manager/manager-ctor_error-004.phpt
+++ b/tests/manager/manager-ctor_error-004.phpt
@@ -17,9 +17,9 @@ echo throws(function () {
 ?>
 ===DONE===
 <?php exit(0); ?>
---EXPECT--
+--EXPECTF--
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
-Failed to parse MongoDB URI: 'mongodb://localhost:27017/?replicaSet='. Value for URI option "replicaset" cannot be empty string.
+Failed to parse MongoDB URI: 'mongodb://localhost:27017/?replicaSet='. Value for URI option "replica%r(s|S)%ret" cannot be empty string.
 OK: Got MongoDB\Driver\Exception\InvalidArgumentException
 Value for URI option "replicaSet" cannot be empty string.
 ===DONE===