diff --git a/ports/jasper/fix-library-name.patch b/ports/jasper/fix-library-name.patch
index 8b4f7173a23763..2e53526a9ddba0 100644
--- a/ports/jasper/fix-library-name.patch
+++ b/ports/jasper/fix-library-name.patch
@@ -1,7 +1,7 @@
-diff --git a/build/jasper.pc.in b/build/jasper.pc.in
+diff --git a/build/pkgconfig/jasper.pc.in b/build/pkgconfig/jasper.pc.in
 index a4ce38f..a9a7bc4 100644
---- a/build/jasper.pc.in
-+++ b/build/jasper.pc.in
+--- a/build/pkgconfig/jasper.pc.in
++++ b/build/pkgconfig/jasper.pc.in
 @@ -6,7 +6,7 @@ Name: JasPer
  Description: Image Processing/Coding Tool Kit with JPEG-2000 Support
  Version: @JAS_VERSION@
diff --git a/ports/jasper/portfile.cmake b/ports/jasper/portfile.cmake
index e89a1762010917..00e8d0ce43ad66 100644
--- a/ports/jasper/portfile.cmake
+++ b/ports/jasper/portfile.cmake
@@ -2,12 +2,11 @@ vcpkg_from_github(
     OUT_SOURCE_PATH SOURCE_PATH
     REPO jasper-software/jasper
     REF "version-${VERSION}"
-    SHA512 940841f4094987526ee23aed84f2b028b0f4d58cd2be91dcf737102018d8da111870959ad64710b14ae1ca4ca8361fc900ff6ecee31f0f23ef435bf7f0935462
+    SHA512 31da8f49cec3ba2a3bb9ba40fa54fe64c97d1e564631c980619f0b3ffca36814adc6c2cb8dc1ead774a15546f308e7a33990821538d1e7b6c885b14ed4e1f711
     HEAD_REF master
     PATCHES
         no_stdc_check.patch
         fix-library-name.patch
-        check-for-atomics-support.patch # https://github.com/jasper-software/jasper/pull/370
 )
 
 if(VCPKG_TARGET_IS_WINDOWS AND NOT VCPKG_TARGET_IS_MINGW)
diff --git a/ports/jasper/vcpkg.json b/ports/jasper/vcpkg.json
index fbc9e9cf08a941..7e4e52b4406a1d 100644
--- a/ports/jasper/vcpkg.json
+++ b/ports/jasper/vcpkg.json
@@ -1,7 +1,6 @@
 {
   "name": "jasper",
-  "version": "4.1.0",
-  "port-version": 1,
+  "version": "4.2.0",
   "description": "Open source implementation of the JPEG-2000 Part-1 standard",
   "homepage": "https://github.com/jasper-software/jasper",
   "license": null,
diff --git a/versions/baseline.json b/versions/baseline.json
index 31ff62765db75f..c20dd7f2ce43b3 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -3661,8 +3661,8 @@
       "port-version": 1
     },
     "jasper": {
-      "baseline": "4.1.0",
-      "port-version": 1
+      "baseline": "4.2.0",
+      "port-version": 0
     },
     "jbig2dec": {
       "baseline": "0.20",
diff --git a/versions/j-/jasper.json b/versions/j-/jasper.json
index 498bc70539417a..7bc002906ff1ac 100644
--- a/versions/j-/jasper.json
+++ b/versions/j-/jasper.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "e7c4fac8db3b39fcce348be5b8d1140a753197ed",
+      "version": "4.2.0",
+      "port-version": 0
+    },
     {
       "git-tree": "3155b993a1ac52e0101edecb422a74513fc3a470",
       "version": "4.1.0",