diff --git a/ports/promise-cpp/fix-ifdef.patch b/ports/promise-cpp/fix-ifdef.patch
deleted file mode 100644
index 8d818b3abe..0000000000
--- a/ports/promise-cpp/fix-ifdef.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-diff --git a/include/promise-cpp/promise.hpp b/include/promise-cpp/promise.hpp
---- a/include/promise-cpp/promise.hpp
-+++ b/include/promise-cpp/promise.hpp
-@@ -2,7 +2,7 @@
- #ifndef INC_PROMISE_HPP_
- #define INC_PROMISE_HPP_
- 
--#ifdef PROMISE_HEADER_ONLY
-+#ifdef PROMISE_HEADONLY
- #define PROMISE_API inline
- #elif defined PROMISE_BUILD_SHARED
- 
diff --git a/ports/promise-cpp/portfile.cmake b/ports/promise-cpp/portfile.cmake
index ed49e05269..69789ac73d 100644
--- a/ports/promise-cpp/portfile.cmake
+++ b/ports/promise-cpp/portfile.cmake
@@ -1,10 +1,9 @@
 vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO xhawk18/promise-cpp
-    REF 2.1.2
-    SHA512 490571e6d6742e05ae6a2549af4e242a1d7084edc583fbbb183798bdddb25d08a7f68becfa94f55b877cba7e2e8e8515964f892881591b5bb394b4b33e6593f7
+    REF ${VERSION}
+    SHA512 18e09cf4caffee2864b45e46b4385daf960aa5ec340e680e4d0303803360c910a8618b9e1365a18693f1d89ba50b42ad7f2e2b5f8b26d3883b48f8c1337efbe5
     HEAD_REF master
-    PATCHES fix-ifdef.patch
 )
 
 file(GLOB PROMISE_HEADERS "${SOURCE_PATH}/include/*.hpp")
diff --git a/ports/promise-cpp/vcpkg.json b/ports/promise-cpp/vcpkg.json
index 3e6b7976de..55a07fd444 100644
--- a/ports/promise-cpp/vcpkg.json
+++ b/ports/promise-cpp/vcpkg.json
@@ -1,6 +1,6 @@
 {
   "name": "promise-cpp",
-  "version": "2.1.2",
+  "version": "2.1.5",
   "description": "C++ promise/A+ library in Javascript style.",
   "homepage": "https://github.com/xhawk18/promise-cpp",
   "dependencies": [
diff --git a/versions/baseline.json b/versions/baseline.json
index f932f6e56f..489f798b7f 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -7613,7 +7613,7 @@
       "port-version": 0
     },
     "promise-cpp": {
-      "baseline": "2.1.2",
+      "baseline": "2.1.5",
       "port-version": 0
     },
     "protobuf": {
diff --git a/versions/p-/promise-cpp.json b/versions/p-/promise-cpp.json
index 63ec6b263c..47cc33cf2b 100644
--- a/versions/p-/promise-cpp.json
+++ b/versions/p-/promise-cpp.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "7c20f268ba20d5ddeba7833dd8eb1e86356147f8",
+      "version": "2.1.5",
+      "port-version": 0
+    },
     {
       "git-tree": "ebacf13f64f6bab1413ec0e45d16259c8cf78279",
       "version": "2.1.2",