diff --git a/cmake/platforms/OSX.cmake b/cmake/platforms/OSX.cmake
--- a/cmake/platforms/OSX.cmake
+++ b/cmake/platforms/OSX.cmake
@@ -2,7 +2,7 @@
 
 set(CMAKE_SYSTEM_NAME Darwin)
 set(CMAKE_SYSTEM_PROCESSOR x86_64)
-set(TOOLCHAIN_PREFIX ${CMAKE_SYSTEM_PROCESSOR}-apple-darwin18)
+set(TOOLCHAIN_PREFIX ${CMAKE_SYSTEM_PROCESSOR}-apple-darwin19)
 
 # Set Corrosion Rust target
 set(Rust_CARGO_TARGET "x86_64-apple-darwin")
diff --git a/contrib/devtools/build_cmake.sh b/contrib/devtools/build_cmake.sh
--- a/contrib/devtools/build_cmake.sh
+++ b/contrib/devtools/build_cmake.sh
@@ -77,7 +77,7 @@
 
 # If cross building for OSX, the python library needs to be added to the python
 # library path.
-export PYTHONPATH="${TOPLEVEL}/depends/x86_64-apple-darwin18/native/lib/python3/dist-packages:${PYTHONPATH:-}"
+export PYTHONPATH="${TOPLEVEL}/depends/x86_64-apple-darwin19/native/lib/python3/dist-packages:${PYTHONPATH:-}"
 
 cmake -GNinja "${TOPLEVEL}" "${CMAKE_FLAGS[@]}"
 
diff --git a/contrib/devtools/symbol-check.py b/contrib/devtools/symbol-check.py
--- a/contrib/devtools/symbol-check.py
+++ b/contrib/devtools/symbol-check.py
@@ -218,7 +218,7 @@
 
 def check_MACHO_min_os(filename) -> bool:
     binary = lief.parse(filename)
-    return binary.build_version.minos == [10, 14, 0]
+    return binary.build_version.minos == [10, 15, 0]
 
 
 def check_MACHO_sdk(filename) -> bool:
diff --git a/contrib/devtools/test-symbol-check.py b/contrib/devtools/test-symbol-check.py
--- a/contrib/devtools/test-symbol-check.py
+++ b/contrib/devtools/test-symbol-check.py
@@ -141,7 +141,7 @@
 
         self.assertEqual(call_symbol_check(cc, source, executable,
                                            ['-Wl,-platform_version', '-Wl,macos',
-                                            '-Wl,10.14', '-Wl,11.4']),
+                                            '-Wl,10.15', '-Wl,11.4']),
                          (1, f'{executable}: failed SDK'))
 
     def test_PE(self):
diff --git a/contrib/gitian-descriptors/gitian-osx.yml b/contrib/gitian-descriptors/gitian-osx.yml
--- a/contrib/gitian-descriptors/gitian-osx.yml
+++ b/contrib/gitian-descriptors/gitian-osx.yml
@@ -40,12 +40,12 @@
 script: |
   WRAP_DIR=$HOME/wrapped
   HOSTS=(
-    x86_64-apple-darwin18
+    x86_64-apple-darwin19
   )
 
   # CMake toolchain file name differ from host name
   declare -A CMAKE_TOOLCHAIN_FILE
-  CMAKE_TOOLCHAIN_FILE[x86_64-apple-darwin18]=OSX.cmake
+  CMAKE_TOOLCHAIN_FILE[x86_64-apple-darwin19]=OSX.cmake
 
   FAKETIME_HOST_PROGS=""
   FAKETIME_PROGS="ar ranlib date dmg xorrisofs"
diff --git a/contrib/guix/README.md b/contrib/guix/README.md
--- a/contrib/guix/README.md
+++ b/contrib/guix/README.md
@@ -64,7 +64,6 @@
 ./contrib/guix/guix-build
 ```
 
-
 ## Cleaning intermediate work directories
 
 By default, `guix-build` leaves all intermediate files or "work directories"
diff --git a/contrib/teamcity/build-configurations.yml b/contrib/teamcity/build-configurations.yml
--- a/contrib/teamcity/build-configurations.yml
+++ b/contrib/teamcity/build-configurations.yml
@@ -368,7 +368,7 @@
         - install-secp256k1
         - install-tests
     post_build: |
-      export PYTHONPATH="${TOPLEVEL}/depends/x86_64-apple-darwin18/native/lib/python3/dist-packages:${PYTHONPATH:-}"
+      export PYTHONPATH="${TOPLEVEL}/depends/x86_64-apple-darwin19/native/lib/python3/dist-packages:${PYTHONPATH:-}"
       ninja osx-dmg
     timeout: 3600
     artifacts:
diff --git a/depends/Makefile b/depends/Makefile
--- a/depends/Makefile
+++ b/depends/Makefile
@@ -215,7 +215,7 @@
 download-one: check-sources $(all_sources)
 
 download-osx:
-	@$(MAKE) -s HOST=x86_64-apple-darwin18 download-one
+	@$(MAKE) -s HOST=x86_64-apple-darwin19 download-one
 download-linux:
 	@$(MAKE) -s HOST=x86_64-unknown-linux-gnu download-one
 download-win:
@@ -231,7 +231,7 @@
 build-linux-aarch64: download-linux
 	@$(MAKE) -s HOST=aarch64-linux-gnu install
 build-osx: download-osx
-	@$(MAKE) -s HOST=x86_64-apple-darwin18 install
+	@$(MAKE) -s HOST=x86_64-apple-darwin19 install
 build-win64: download-win
 	@$(MAKE) -s HOST=x86_64-w64-mingw32 install
 
diff --git a/depends/hosts/darwin.mk b/depends/hosts/darwin.mk
--- a/depends/hosts/darwin.mk
+++ b/depends/hosts/darwin.mk
@@ -1,4 +1,4 @@
-OSX_MIN_VERSION=10.14
+OSX_MIN_VERSION=10.15
 OSX_SDK_VERSION=10.15.1
 XCODE_VERSION=11.3.1
 XCODE_BUILD_ID=11C505
diff --git a/doc/release-notes.md b/doc/release-notes.md
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -5,4 +5,4 @@
   <https://download.bitcoinabc.org/0.27.4/>
 
 This release includes the following features and fixes:
- - From this version onwards, macOS versions earlier than 10.14 are no longer supported.
+ - From this version onwards, macOS versions earlier than 10.15 are no longer supported.