diff --git a/CMakeLists.txt b/CMakeLists.txt
index 1a9e231..d5f1ffe 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -119,7 +119,7 @@
 # SWIFT_VERSION is deliberately /not/ cached so that an existing build directory
 # can be reused when a new version of Swift comes out (assuming the user hasn't
 # manually set it as part of their own CMake configuration).
-set(SWIFT_VERSION "4.1.1")
+set(SWIFT_VERSION "4.1.2")
 
 set(SWIFT_VENDOR "" CACHE STRING
     "The vendor name of the Swift compiler")
diff --git a/test/Serialization/Recovery/crash-recovery.swift b/test/Serialization/Recovery/crash-recovery.swift
index 9e6e937..017abea 100644
--- a/test/Serialization/Recovery/crash-recovery.swift
+++ b/test/Serialization/Recovery/crash-recovery.swift
@@ -14,7 +14,7 @@
 
 // CHECK-CRASH: error: fatal error encountered while reading from module 'Lib'; please file a bug report with your project and the crash log
 // CHECK-CRASH-3-NOT: note
-// CHECK-CRASH-4: note: compiling as Swift 4.1.1, with 'Lib' built as Swift 3.3
+// CHECK-CRASH-4: note: compiling as Swift 4.1.2, with 'Lib' built as Swift 3.3
 // CHECK-CRASH-LABEL: *** DESERIALIZATION FAILURE (please include this section in any bug report) ***
 // CHECK-CRASH: could not find 'disappearingMethod()' in parent class
 // CHECK-CRASH: While loading members for 'Sub' in module 'Lib'
diff --git a/test/Serialization/Recovery/types-4-to-3.swift b/test/Serialization/Recovery/types-4-to-3.swift
index 0b49525..e5da85d 100644
--- a/test/Serialization/Recovery/types-4-to-3.swift
+++ b/test/Serialization/Recovery/types-4-to-3.swift
@@ -16,8 +16,8 @@
 func requiresConformance(_: B_RequiresConformance<B_ConformsToProto>) {}
 func requiresConformance(_: B_RequiresConformance<C_RelyOnConformanceImpl.Assoc>) {}
 
-class Sub: Base {} // expected-error {{cannot inherit from class 'Base' (compiled with Swift 4.1.1) because it has overridable members that could not be loaded in Swift 3.3}}
-class Impl: Proto {} // expected-error {{type 'Impl' cannot conform to protocol 'Proto' (compiled with Swift 4.1.1) because it has requirements that could not be loaded in Swift 3.3}}
+class Sub: Base {} // expected-error {{cannot inherit from class 'Base' (compiled with Swift 4.1.2) because it has overridable members that could not be loaded in Swift 3.3}}
+class Impl: Proto {} // expected-error {{type 'Impl' cannot conform to protocol 'Proto' (compiled with Swift 4.1.2) because it has requirements that could not be loaded in Swift 3.3}}
 
 #else // TEST