diff --git a/Nimble.xcodeproj/project.pbxproj b/Nimble.xcodeproj/project.pbxproj
index 875353b23..be20cb29b 100644
--- a/Nimble.xcodeproj/project.pbxproj
+++ b/Nimble.xcodeproj/project.pbxproj
@@ -1023,7 +1023,7 @@
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
 				INFOPLIST_FILE = Sources/Nimble/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				PRODUCT_BUNDLE_IDENTIFIER = net.jeffhui.Nimble;
@@ -1046,7 +1046,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				GCC_PREPROCESSOR_DEFINITIONS = "DEBUG=1 $(inherited)";
 				INFOPLIST_FILE = Tests/NimbleTests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				METAL_ENABLE_DEBUG_INFO = YES;
@@ -1077,7 +1077,7 @@
 				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				GCC_PREPROCESSOR_DEFINITIONS = "DEBUG=1 $(inherited)";
 				INFOPLIST_FILE = Tests/NimbleTests/Info.plist;
-				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				METAL_ENABLE_DEBUG_INFO = YES;
@@ -1105,7 +1105,7 @@
 				GCC_TREAT_WARNINGS_AS_ERRORS = YES;
 				INFOPLIST_FILE = Sources/Nimble/Info.plist;
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
-				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 12.0;
 				PRODUCT_BUNDLE_IDENTIFIER = net.jeffhui.Nimble;
diff --git a/Project.swift b/Project.swift
index 74c9a1a9e..a792d892c 100644
--- a/Project.swift
+++ b/Project.swift
@@ -2,7 +2,7 @@ import ProjectDescription
 
 let bundleIDPrefix = "net.jeffhui"
 let destinations: Destinations = .iOS.union(Destinations.macOS)
-let deploymentTargets: DeploymentTargets =  .multiplatform(iOS: "13.0", macOS: "12.0")
+let deploymentTargets: DeploymentTargets =  .multiplatform(iOS: "15.0", macOS: "12.0")
 
 let target: Target = .target(
   name: "Nimble",