diff --git a/Bugsnag.xcodeproj/project.pbxproj b/Bugsnag.xcodeproj/project.pbxproj
index ef6ecf636..469a624aa 100644
--- a/Bugsnag.xcodeproj/project.pbxproj
+++ b/Bugsnag.xcodeproj/project.pbxproj
@@ -5036,7 +5036,7 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				GCC_PREPROCESSOR_DEFINITIONS = "$(inherited)";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -5063,7 +5063,7 @@
 				DYLIB_CURRENT_VERSION = 1;
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -5084,6 +5084,7 @@
 				DEVELOPMENT_TEAM = "";
 				GCC_PREPROCESSOR_DEFINITIONS = "$(inherited)";
 				INFOPLIST_FILE = Tests/BugsnagTests/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -5106,6 +5107,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = Tests/BugsnagTests/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -5141,6 +5143,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				MARKETING_VERSION = 6.38.0;
 				PRODUCT_NAME = Bugsnag;
 				SDKROOT = macosx;
@@ -5167,6 +5170,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				MARKETING_VERSION = 6.38.0;
 				PRODUCT_NAME = Bugsnag;
 				SDKROOT = macosx;
@@ -5187,6 +5191,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/../Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				MARKETING_VERSION = 6.38.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.bugsnag.Bugsnag-macOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -5208,6 +5213,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/../Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				MARKETING_VERSION = 6.38.0;
 				PRODUCT_BUNDLE_IDENTIFIER = "com.bugsnag.Bugsnag-macOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -5239,6 +5245,7 @@
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = 3;
+				TVOS_DEPLOYMENT_TARGET = 15.0;
 			};
 			name = Debug;
 		};
@@ -5263,6 +5270,7 @@
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = 3;
+				TVOS_DEPLOYMENT_TARGET = 15.0;
 			};
 			name = Release;
 		};
@@ -5285,6 +5293,7 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "Tests/BugsnagTests/Tests-Bridging-Header.h";
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 3;
+				TVOS_DEPLOYMENT_TARGET = 15.0;
 			};
 			name = Debug;
 		};
@@ -5306,6 +5315,7 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "Tests/BugsnagTests/Tests-Bridging-Header.h";
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 3;
+				TVOS_DEPLOYMENT_TARGET = 15.0;
 			};
 			name = Release;
 		};
@@ -5315,7 +5325,7 @@
 			buildSettings = {
 				CODE_SIGN_IDENTITY = "";
 				CODE_SIGN_STYLE = Automatic;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				MARKETING_VERSION = 6.38.0;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -5329,7 +5339,7 @@
 			buildSettings = {
 				CODE_SIGN_IDENTITY = "";
 				CODE_SIGN_STYLE = Automatic;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				MARKETING_VERSION = 6.38.0;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -5345,6 +5355,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "Tests/TestHost-iOS/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -5364,6 +5375,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "Tests/TestHost-iOS/Info.plist";
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -5432,6 +5444,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Debug;
 		};
@@ -5491,6 +5504,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Release;
 		};
@@ -5540,6 +5554,7 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "Tests/BugsnagTests/Tests-Bridging-Header.h";
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Debug;
 		};
@@ -5588,6 +5603,7 @@
 				SWIFT_OBJC_BRIDGING_HEADER = "Tests/BugsnagTests/Tests-Bridging-Header.h";
 				SWIFT_VERSION = 4.2;
 				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Release;
 		};
diff --git a/BugsnagNetworkRequestPlugin/BugsnagNetworkRequestPlugin.xcodeproj/project.pbxproj b/BugsnagNetworkRequestPlugin/BugsnagNetworkRequestPlugin.xcodeproj/project.pbxproj
index 5538af63c..732a5fd05 100644
--- a/BugsnagNetworkRequestPlugin/BugsnagNetworkRequestPlugin.xcodeproj/project.pbxproj
+++ b/BugsnagNetworkRequestPlugin/BugsnagNetworkRequestPlugin.xcodeproj/project.pbxproj
@@ -982,7 +982,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = 7W9PZ27Y5F;
 				INFOPLIST_FILE = "../Tests/TestHost-iOS/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -1000,7 +1000,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = 7W9PZ27Y5F;
 				INFOPLIST_FILE = "../Tests/TestHost-iOS/Info.plist";
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -1017,7 +1017,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = 7W9PZ27Y5F;
 				HEADER_SEARCH_PATHS = ../Bugsnag/include;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				OTHER_LDFLAGS = "-ObjC";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -1031,7 +1031,7 @@
 				CODE_SIGN_STYLE = Automatic;
 				DEVELOPMENT_TEAM = 7W9PZ27Y5F;
 				HEADER_SEARCH_PATHS = ../Bugsnag/include;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				OTHER_LDFLAGS = "-ObjC";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SKIP_INSTALL = YES;
@@ -1068,6 +1068,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Debug;
 		};
@@ -1100,6 +1101,7 @@
 				SKIP_INSTALL = YES;
 				SWIFT_EMIT_LOC_STRINGS = YES;
 				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Release;
 		};
@@ -1120,6 +1122,7 @@
 				SDKROOT = watchos;
 				SWIFT_EMIT_LOC_STRINGS = NO;
 				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Debug;
 		};
@@ -1140,6 +1143,7 @@
 				SDKROOT = watchos;
 				SWIFT_EMIT_LOC_STRINGS = NO;
 				TARGETED_DEVICE_FAMILY = 4;
+				WATCHOS_DEPLOYMENT_TARGET = 9.0;
 			};
 			name = Release;
 		};
@@ -1350,7 +1354,7 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = BugsnagNetworkRequestPlugin/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -1374,7 +1378,7 @@
 				DYLIB_INSTALL_NAME_BASE = "@rpath";
 				INFOPLIST_FILE = BugsnagNetworkRequestPlugin/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -1395,7 +1399,7 @@
 				GCC_WARN_PEDANTIC = NO;
 				GCC_WARN_UNUSED_PARAMETER = NO;
 				INFOPLIST_FILE = BugsnagNetworkRequestPluginTests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -1416,7 +1420,7 @@
 				GCC_WARN_PEDANTIC = NO;
 				GCC_WARN_UNUSED_PARAMETER = NO;
 				INFOPLIST_FILE = BugsnagNetworkRequestPluginTests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -1446,6 +1450,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.bugsnag.BugsnagNetworkRequestPlugin;
 				PRODUCT_NAME = BugsnagNetworkRequestPlugin;
 				SDKROOT = macosx;
@@ -1470,6 +1475,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.bugsnag.BugsnagNetworkRequestPlugin;
 				PRODUCT_NAME = BugsnagNetworkRequestPlugin;
 				SDKROOT = macosx;
@@ -1491,6 +1497,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/../Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.bugsnag.BugsnagNetworkRequestPluginTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
@@ -1511,6 +1518,7 @@
 					"@executable_path/../Frameworks",
 					"@loader_path/../Frameworks",
 				);
+				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				PRODUCT_BUNDLE_IDENTIFIER = com.bugsnag.BugsnagNetworkRequestPluginTests;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
@@ -1538,6 +1546,7 @@
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = 3;
+				TVOS_DEPLOYMENT_TARGET = 15.0;
 			};
 			name = Debug;
 		};
@@ -1562,6 +1571,7 @@
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = 3;
+				TVOS_DEPLOYMENT_TARGET = 15.0;
 			};
 			name = Release;
 		};
@@ -1582,6 +1592,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
 				TARGETED_DEVICE_FAMILY = 3;
+				TVOS_DEPLOYMENT_TARGET = 15.0;
 			};
 			name = Debug;
 		};
@@ -1602,6 +1613,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
 				TARGETED_DEVICE_FAMILY = 3;
+				TVOS_DEPLOYMENT_TARGET = 15.0;
 			};
 			name = Release;
 		};
diff --git a/features/fixtures/ios/iOSTestApp.xcodeproj/project.pbxproj b/features/fixtures/ios/iOSTestApp.xcodeproj/project.pbxproj
index 16069c37d..582d65a99 100644
--- a/features/fixtures/ios/iOSTestApp.xcodeproj/project.pbxproj
+++ b/features/fixtures/ios/iOSTestApp.xcodeproj/project.pbxproj
@@ -1172,7 +1172,7 @@
 					../../../Bugsnag/Payload,
 				);
 				INFOPLIST_FILE = iOSTestApp/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				LINKER_DISPLAYS_MANGLED_NAMES = NO;
 				OTHER_SWIFT_FLAGS = "-Onone";
@@ -1214,7 +1214,7 @@
 					../../../Bugsnag/Payload,
 				);
 				INFOPLIST_FILE = iOSTestApp/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				LINKER_DISPLAYS_MANGLED_NAMES = NO;
 				MTL_ENABLE_DEBUG_INFO = YES;
diff --git a/features/fixtures/ios/iOSTestAppXcFramework.xcodeproj/project.pbxproj b/features/fixtures/ios/iOSTestAppXcFramework.xcodeproj/project.pbxproj
index 1ad62a3d3..51afa3a81 100644
--- a/features/fixtures/ios/iOSTestAppXcFramework.xcodeproj/project.pbxproj
+++ b/features/fixtures/ios/iOSTestAppXcFramework.xcodeproj/project.pbxproj
@@ -1187,7 +1187,7 @@
 					../../../Bugsnag/Payload,
 				);
 				INFOPLIST_FILE = iOSTestApp/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
@@ -1233,7 +1233,7 @@
 					../../../Bugsnag/Payload,
 				);
 				INFOPLIST_FILE = iOSTestApp/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 12.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15;
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/Frameworks",
diff --git a/features/fixtures/macos/macOSTestApp.xcodeproj/project.pbxproj b/features/fixtures/macos/macOSTestApp.xcodeproj/project.pbxproj
index 262f45003..49ba5b2ee 100644
--- a/features/fixtures/macos/macOSTestApp.xcodeproj/project.pbxproj
+++ b/features/fixtures/macos/macOSTestApp.xcodeproj/project.pbxproj
@@ -1143,6 +1143,7 @@
 				);
 				INFOPLIST_FILE = macOSTestApp/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 12.4;
 				PRODUCT_BUNDLE_IDENTIFIER = com.bugsnag.fixtures.macOSTestApp;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				STRIP_INSTALLED_PRODUCT = NO;
@@ -1168,6 +1169,7 @@
 				);
 				INFOPLIST_FILE = macOSTestApp/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks";
+				MACOSX_DEPLOYMENT_TARGET = 12.4;
 				PRODUCT_BUNDLE_IDENTIFIER = com.bugsnag.fixtures.macOSTestApp;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				STRIP_INSTALLED_PRODUCT = NO;