diff --git a/.evergreen/config/generated/build/build-libmongoc-8.3.yml b/.evergreen/config/generated/build/build-libmongoc-8.3.yml
index 01b2889f4..cb67c6450 100644
--- a/.evergreen/config/generated/build/build-libmongoc-8.3.yml
+++ b/.evergreen/config/generated/build/build-libmongoc-8.3.yml
@@ -12,7 +12,7 @@ tasks:
       - func: "compile driver"
         vars:
           PHP_VERSION: "8.3"
-          LIBMONGOC_VERSION: "1.27.2"
+          LIBMONGOC_VERSION: "1.27.4"
       - func: "upload build"
 
   - name: "build-php-8.3-libmongoc-next-stable"
diff --git a/.evergreen/config/templates/build/build-libmongoc.yml b/.evergreen/config/templates/build/build-libmongoc.yml
index 7298165f3..aaa6dd70e 100644
--- a/.evergreen/config/templates/build/build-libmongoc.yml
+++ b/.evergreen/config/templates/build/build-libmongoc.yml
@@ -11,7 +11,7 @@ tasks:
       - func: "compile driver"
         vars:
           PHP_VERSION: "%phpVersion%"
-          LIBMONGOC_VERSION: "1.27.2"
+          LIBMONGOC_VERSION: "1.27.4"
       - func: "upload build"
 
   - name: "build-php-%phpVersion%-libmongoc-next-stable"
diff --git a/config.m4 b/config.m4
index 66902e010..99b38740c 100644
--- a/config.m4
+++ b/config.m4
@@ -276,7 +276,7 @@ if test "$PHP_MONGODB" != "no"; then
   PHP_MONGODB_MONGOCRYPT_VERSION_STRING="None"
 
   if test "$PHP_MONGODB_SYSTEM_LIBS" != "no"; then
-    PKG_CHECK_MODULES([PHP_MONGODB_BSON], [libbson-1.0 >= 1.27.2], [
+    PKG_CHECK_MODULES([PHP_MONGODB_BSON], [libbson-1.0 >= 1.27.4], [
       PHP_MONGODB_BSON_VERSION=`$PKG_CONFIG libbson-1.0 --modversion`
       PHP_MONGODB_BSON_VERSION_STRING="System ($PHP_MONGODB_BSON_VERSION)"
 
@@ -284,10 +284,10 @@ 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 >= 1.27.2])
+      AC_MSG_ERROR([Could not find system library for libbson >= 1.27.4])
     ])
 
-    PKG_CHECK_MODULES([PHP_MONGODB_MONGOC], [libmongoc-1.0 >= 1.27.2], [
+    PKG_CHECK_MODULES([PHP_MONGODB_MONGOC], [libmongoc-1.0 >= 1.27.4], [
       PHP_MONGODB_BSON_VERSION=`$PKG_CONFIG libbson-1.0 --modversion`
       PHP_MONGODB_BSON_VERSION_STRING="System ($PHP_MONGODB_BSON_VERSION)"
 
@@ -295,7 +295,7 @@ 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 >= 1.27.2)
+      AC_MSG_ERROR(Could not find system library for libmongoc >= 1.27.4)
     ])
 
     if test "$PHP_MONGODB_CLIENT_SIDE_ENCRYPTION" != "no"; then
diff --git a/sbom.json b/sbom.json
index 3c65ffcc8..baf9d4c8f 100644
--- a/sbom.json
+++ b/sbom.json
@@ -19,22 +19,22 @@
       "version": "1.10.0"
     },
     {
-      "bom-ref": "pkg:github/mongodb/mongo-c-driver@1.27.2",
+      "bom-ref": "pkg:github/mongodb/mongo-c-driver@1.27.4",
       "externalReferences": [
         {
           "type": "distribution",
-          "url": "https://github.com/mongodb/mongo-c-driver/archive/refs/tags/1.27.2.tar.gz"
+          "url": "https://github.com/mongodb/mongo-c-driver/archive/refs/tags/1.27.4.tar.gz"
         },
         {
           "type": "website",
-          "url": "https://github.com/mongodb/mongo-c-driver/tree/1.27.2"
+          "url": "https://github.com/mongodb/mongo-c-driver/tree/1.27.4"
         }
       ],
       "group": "mongodb",
       "name": "mongo-c-driver",
-      "purl": "pkg:github/mongodb/mongo-c-driver@1.27.2",
+      "purl": "pkg:github/mongodb/mongo-c-driver@1.27.4",
       "type": "library",
-      "version": "1.27.2"
+      "version": "1.27.4"
     }
   ],
   "dependencies": [
@@ -42,11 +42,11 @@
       "ref": "pkg:github/mongodb/libmongocrypt@1.10.0"
     },
     {
-      "ref": "pkg:github/mongodb/mongo-c-driver@1.27.2"
+      "ref": "pkg:github/mongodb/mongo-c-driver@1.27.4"
     }
   ],
   "metadata": {
-    "timestamp": "2024-06-06T07:13:52.679415+00:00",
+    "timestamp": "2024-07-03T08:46:07.057692+00:00",
     "tools": [
       {
         "externalReferences": [
@@ -90,7 +90,7 @@
     ]
   },
   "serialNumber": "urn:uuid:acb30d08-ee47-4ff0-b301-d66ef1f54082",
-  "version": 1,
+  "version": 2,
   "$schema": "http://cyclonedx.org/schema/bom-1.5.schema.json",
   "bomFormat": "CycloneDX",
   "specVersion": "1.5"
diff --git a/src/LIBMONGOC_VERSION_CURRENT b/src/LIBMONGOC_VERSION_CURRENT
index 457f03854..d6201580e 100644
--- a/src/LIBMONGOC_VERSION_CURRENT
+++ b/src/LIBMONGOC_VERSION_CURRENT
@@ -1 +1 @@
-1.27.2
+1.27.4
diff --git a/src/libmongoc b/src/libmongoc
index a08d59d8d..3d1308b9f 160000
--- a/src/libmongoc
+++ b/src/libmongoc
@@ -1 +1 @@
-Subproject commit a08d59d8d3971a02954b6b8e659c656989a15315
+Subproject commit 3d1308b9fbc8411f3f62989bcfffc5790a7c63e4