diff --git a/CHANGELOG.md b/CHANGELOG.md
index b45d327..38389a2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,9 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.0.76] - 2021-12-03
+* Updated to use Swift 5.5.1
+
 ## [1.0.75] - 2021-12-02
 * Updated to use Xcode 13.
 
diff --git a/VERSION b/VERSION
index e9acec7..e7468c7 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.0.75
+1.0.76
diff --git a/lib/Builders/DispatchBuilder.js b/lib/Builders/DispatchBuilder.js
index 687b7ee..f82359d 100644
--- a/lib/Builders/DispatchBuilder.js
+++ b/lib/Builders/DispatchBuilder.js
@@ -57,6 +57,7 @@ module.exports = class DispatchBuilder extends Builder {
 
       -D CMAKE_INSTALL_PREFIX=/
       -D CMAKE_BUILD_TYPE=Release
+      -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15
 
       -D ENABLE_TESTING=NO
       -D ENABLE_SWIFT=YES
diff --git a/lib/Builders/FoundationBuilder.js b/lib/Builders/FoundationBuilder.js
index f21e7d8..7bdad53 100644
--- a/lib/Builders/FoundationBuilder.js
+++ b/lib/Builders/FoundationBuilder.js
@@ -71,6 +71,7 @@ module.exports = class FoundationBuilder extends Builder {
 
     -D CMAKE_INSTALL_PREFIX=/
     -D CMAKE_BUILD_TYPE=Release
+    -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15
     -D ENABLE_TESTING=NO
 
     -D CMAKE_Swift_COMPILER=${swift.paths.builds}/bin/swiftc
diff --git a/lib/Builders/LLBBuilder.js b/lib/Builders/LLBBuilder.js
index ece8f99..80c9c6f 100644
--- a/lib/Builders/LLBBuilder.js
+++ b/lib/Builders/LLBBuilder.js
@@ -45,6 +45,7 @@ module.exports = class LLBBuilder extends Builder {
       cd ${this.paths.builds} && cmake
       -G Ninja
       -D CMAKE_BUILD_TYPE=Release
+      -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15
       -D CMAKE_INSTALL_PREFIX=/
 
       -D CMAKE_Swift_FLAGS="-Xlinker -v -Xfrontend -target -Xfrontend ${hostArch}-apple-macos10.10 -target ${hostArch}-apple-macos10.10 -v"
diff --git a/lib/Builders/LLVMBuilder.js b/lib/Builders/LLVMBuilder.js
index b324b25..d1e31b6 100644
--- a/lib/Builders/LLVMBuilder.js
+++ b/lib/Builders/LLVMBuilder.js
@@ -41,6 +41,7 @@ module.exports = class LLVMBuilder extends Builder {
       -S ${this.paths.sources}/llvm
       -B ${this.paths.builds}
       -D CMAKE_BUILD_TYPE=Release
+      -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15
       -D LLVM_INCLUDE_EXAMPLES=false
       -D LLVM_INCLUDE_TESTS=false
       -D LLVM_INCLUDE_DOCS=false
diff --git a/lib/Builders/SwiftDriverBuilder.js b/lib/Builders/SwiftDriverBuilder.js
index eca3f3e..df8f5ff 100644
--- a/lib/Builders/SwiftDriverBuilder.js
+++ b/lib/Builders/SwiftDriverBuilder.js
@@ -47,6 +47,7 @@ module.exports = class SwiftDriverBuilder extends Builder {
       -G Ninja
       -D CMAKE_INSTALL_PREFIX=/
       -D CMAKE_BUILD_TYPE=Release
+      -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15
 
       -D TSC_DIR=${tsc.paths.builds}/cmake/modules
       -D LLBuild_DIR=${llb.paths.builds}/cmake/modules
diff --git a/lib/Builders/SwiftStdLibBuilder.js b/lib/Builders/SwiftStdLibBuilder.js
index 2a71498..ea2523d 100644
--- a/lib/Builders/SwiftStdLibBuilder.js
+++ b/lib/Builders/SwiftStdLibBuilder.js
@@ -107,6 +107,7 @@ module.exports = class SwiftStdLibBuilder extends Builder {
     -D SWIFT_ANDROID_${this.arch.swiftArch}_ICU_DATA=${icu.paths.lib}/libicudataswift.so
 
     -D CMAKE_BUILD_TYPE=Release
+    -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15
 
     # build with the host compiler
     -D SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER=YES
diff --git a/lib/Builders/SwiftTSCBuilder.js b/lib/Builders/SwiftTSCBuilder.js
index e695221..28ae6be 100644
--- a/lib/Builders/SwiftTSCBuilder.js
+++ b/lib/Builders/SwiftTSCBuilder.js
@@ -37,6 +37,7 @@ module.exports = class SwiftTSCBuilder extends Builder {
       cd ${this.paths.builds} && cmake
       -G Ninja
       -D CMAKE_BUILD_TYPE=Release
+      -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15
       -D CMAKE_INSTALL_PREFIX=/
       -D CMAKE_Swift_FLAGS="-sdk ${this.paths.xcMacOsSdkPath}"
       ${this.paths.sources}
diff --git a/lib/Builders/YAMSBuilder.js b/lib/Builders/YAMSBuilder.js
index 2a1f75c..8c00f81 100644
--- a/lib/Builders/YAMSBuilder.js
+++ b/lib/Builders/YAMSBuilder.js
@@ -38,6 +38,7 @@ module.exports = class YAMSBuilder extends Builder {
       -G Ninja
       -D CMAKE_INSTALL_PREFIX=/
       -D CMAKE_BUILD_TYPE=Release
+      -D CMAKE_OSX_DEPLOYMENT_TARGET=10.15
       ${this.paths.sources}
 `;
     this.executeCommands(cmd);
diff --git a/lib/Git/Revision.js b/lib/Git/Revision.js
index 3b40182..fdf2b0a 100644
--- a/lib/Git/Revision.js
+++ b/lib/Git/Revision.js
@@ -25,6 +25,7 @@
 // See also: $ToolChain/Sources/swift/utils/update_checkout/update-checkout-config.json
 
 module.exports = {
+  // 1.0.76 - 11a4d5a4f54cdfb803b3c75e3c4dd5d2dfc1974c - tag:swift-5.5.1-RELEASE
   // 1.0.74 - d2054e1c741f549caffbe1f286a9b11066b5c696 - tag:swift-5.5-RELEASE
   // 1.0.73 - 282fe25d1757ff9974ade028d92111acdae6876a - tag:swift-5.4.3-RELEASE
   // 1.0.71 - b666aa622e73a4f6d826a10d7ba8e5db302d1ec1 - tag:swift-5.4.2-RELEASE @ Thu Jun 24 23:34:53 2021 -0700
@@ -34,15 +35,16 @@ module.exports = {
   // 1.0.62 - 253ea65ba72933c92850803f0c26aa768757b3ab - tag:swift-5.3.1-RELEASE @ 12. November 2020 at 09:17:14 CET
   // 1.0.56 - e7c2f897ad2766b1664b56f3a77d939b844dd135 - tag:swift-5.3-RELEASE @ 11. September 2020 at 03:51:47 CEST
   // 1.0.54 - 443e9a41d1a7c1fcae280490144fcbf8461d3499 - tag:swift-5.2-RELEASE @ 24. March 2020 at 19:15:32 CET
-  swift: "d2054e1c741f549caffbe1f286a9b11066b5c696",
+  swift: "11a4d5a4f54cdfb803b3c75e3c4dd5d2dfc1974c",
 
+  // 1.0.76 - e7c11bcb69c785c3470c91daf9c5d1b13162e7a6 - tag:swift-5.5.1-RELEASE
   // 1.0.74 - 851fbd3cb89385ba733bc37d6149280996715898 - tag:swift-5.5-RELEASE
   // 1.0.73 - f13ea5dcc055e5d2d7c02e90d8c9907ca9dc72e1 - tag:swift-5.4.3-RELEASE
   // 1.0.68 - f13ea5dcc055e5d2d7c02e90d8c9907ca9dc72e1 - tag:swift-5.4-RELEASE @ Aug 14 14:49:59 2020 -0700
   // 1.0.62 - 25ea083a3af4ca09eee2b6dbdf58f1b163f87008 - tag:swift-5.3.1-RELEASE @ 2. September 2020 at 09:28:48 CEST
   // 1.0.56 - 25ea083a3af4ca09eee2b6dbdf58f1b163f87008 - tag:swift-5.3-RELEASE @ 2. September 2020 at 09:28:48 CEST
   // 1.0.54 - c992dacf3ca114806e6ac9ffc9113b19255be9fe - tag:swift-5.2-RELEASE @ 1. October 2019 at 17:57:33 CEST
-  dispatch: "851fbd3cb89385ba733bc37d6149280996715898",
+  dispatch: "e7c11bcb69c785c3470c91daf9c5d1b13162e7a6",
 
   // 1.0.74 - 5663ff1147d8f162f1cb44bfdb3e8c42addb7b69 - tag:swift-5.5-RELEASE
   // 1.0.73 - dee1e194a44e660c205960adb470ea0981f78b49 - tag:swift-5.4.3-RELEASE
@@ -55,6 +57,7 @@ module.exports = {
   // 1.0.54 - 8d0871530c52456278ef8c83cb049e6d70b28a6b - tag:swift-5.2-RELEASE @ 18. March 2020 at 08:25:12 CET
   foundation: "5663ff1147d8f162f1cb44bfdb3e8c42addb7b69",
 
+  // 1.0.76 - 47e0531f53ce4508b522a28d407ac39b639781f4 - tag:swift-5.5.1-RELEASE
   // 1.0.74 - fbf00809f11885f819457563beb069a2298b368f - tag:swift-5.5-RELEASE
   // 1.0.73 - 8ee67e3af469eb38c9616f971abd5a47fe8d6405 - tag:swift-5.4.3-RELEASE
   // 1.0.71 - 8ee67e3af469eb38c9616f971abd5a47fe8d6405 - tag:swift-5.4.2-RELEASE @ Thu May 27 16:18:16 2021 -0700
@@ -62,7 +65,7 @@ module.exports = {
   // 1.0.67 - 439a44695a0534a26557cc34b4fe650dccb46aed - tag:swift-5.4-RELEASE @ 13. April 2021 at 19:37:22 CEST
   // 1.0.62 - 3093af41dd65ad466dcd5603e9289244edfee4f5 - tag:swift-5.3.1-RELEASE @ 21. October 2020 at 01:10:23 CEST
   // 1.0.56 - c39a810ec308dd4a8d93c5011fb73a5c987e8680 - tag:swift-5.3-RELEASE @ 10. September 2020 at 08:07:01 CEST
-  llvm: "fbf00809f11885f819457563beb069a2298b368f",
+  llvm: "47e0531f53ce4508b522a28d407ac39b639781f4",
 
   // 1.0.74 - 9c8096a23f44794bde297452d87c455fc4f76d42 - tag:swift-5.5-RELEASE
   // 1.0.73 - 9c8096a23f44794bde297452d87c455fc4f76d42 - tag:swift-5.4.3-RELEASE
@@ -128,6 +131,6 @@ module.exports = {
   // 1.0.69 - 93e8b927225a62b963ebe13ab11e04192fa8a67b - tag:swift-5.4-RELEASE
   sd: "12cd468c8182b4e1038268c664354005803fcdef",
 
-  // 1.0.74 - 0141f53dd525706c803b0c20aa8ad36f9ecd45e5 - tag:swift-5.5-RELEASE
+  // 1.0.74 - 0141f53dd525706c803b0c20aa8ad36f9ecd45e5 - tag:1.1.5
   sc: "0141f53dd525706c803b0c20aa8ad36f9ecd45e5",
 };