diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index cc22a31c..975c158c 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -164,7 +164,7 @@ jobs:
         uses: actions/checkout@v3
       - name: set up environment
         run: |
-          echo "XCODE_SELECTED=/Applications/Xcode_14.3.app" >> $GITHUB_ENV
+          echo "XCODE_SELECTED=/Applications/Xcode_15.0.app" >> $GITHUB_ENV
           echo "HOMEBREW_NO_AUTO_UPDATE=1" >> $GITHUB_ENV
           echo "HOMEBREW_NO_INSTALL_CLEANUP=1" >> $GITHUB_ENV
           echo "MACOSX_DEPLOYMENT_TARGET=10.9" >> $GITHUB_ENV
@@ -213,7 +213,7 @@ jobs:
         uses: actions/checkout@v3
       - name: set up environment
         run: |
-          echo "XCODE_SELECTED=/Applications/Xcode_14.3.app" >> $GITHUB_ENV
+          echo "XCODE_SELECTED=/Applications/Xcode_15.0.app" >> $GITHUB_ENV
           echo "HOMEBREW_NO_AUTO_UPDATE=1" >> $GITHUB_ENV
           echo "HOMEBREW_NO_INSTALL_CLEANUP=1" >> $GITHUB_ENV
           echo "MACOSX_DEPLOYMENT_TARGET=10.9" >> $GITHUB_ENV
diff --git a/build/make/platforms/macosuniversal.mak b/build/make/platforms/macosuniversal.mak
index 6796cb40..f1a62074 100644
--- a/build/make/platforms/macosuniversal.mak
+++ b/build/make/platforms/macosuniversal.mak
@@ -144,7 +144,7 @@ endif
 #Strict flags
 ifeq ($(STRICT),1)
 #"long long" is used in sysTypes.h
-OBJECTFLAGS += -Wno-long-long -Werror -Wall -Wextra -pedantic-errors -fdiagnostics-show-option -Wno-parentheses -Wno-missing-field-initializers -Wno-unused-parameter -Wno-unused-local-typedef -Wno-unknown-warning-option -Wno-deprecated-copy -Wno-unused-but-set-variable -Wno-deprecated-declarations
+OBJECTFLAGS += -Wno-long-long -Werror -Wall -Wextra -pedantic-errors -fdiagnostics-show-option -Wno-parentheses -Wno-missing-field-initializers -Wno-unused-parameter -Wno-unused-local-typedef -Wno-unknown-warning-option -Wno-deprecated-copy -Wno-unused-but-set-variable -Wno-deprecated-declarations -Wno-invalid-utf8
 #OBJECTFLAGS += -Wno-long-long -Werror -Wall -Wextra -pedantic-errors -fdiagnostics-show-option
 LIBRARYFLAGS +=  -Werror -Wall -Wextra -Werror
 EXECUTABLEFLAGS += -Werror -Wall -Wextra
diff --git a/build/make/platforms/macx64.mak b/build/make/platforms/macx64.mak
index aa71d944..0dd757f2 100644
--- a/build/make/platforms/macx64.mak
+++ b/build/make/platforms/macx64.mak
@@ -144,7 +144,7 @@ endif
 #Strict flags
 ifeq ($(STRICT),1)
 #"long long" is used in sysTypes.h
-OBJECTFLAGS += -Wno-long-long -Werror -Wall -Wextra -pedantic-errors -fdiagnostics-show-option -Wno-parentheses -Wno-missing-field-initializers -Wno-unused-parameter -Wno-unused-local-typedef -Wno-unknown-warning-option -Wno-deprecated-copy -Wno-unused-but-set-variable -Wno-deprecated-declarations
+OBJECTFLAGS += -Wno-long-long -Werror -Wall -Wextra -pedantic-errors -fdiagnostics-show-option -Wno-parentheses -Wno-missing-field-initializers -Wno-unused-parameter -Wno-unused-local-typedef -Wno-unknown-warning-option -Wno-deprecated-copy -Wno-unused-but-set-variable -Wno-deprecated-declarations -Wno-invalid-utf8
 #OBJECTFLAGS += -Wno-long-long -Werror -Wall -Wextra -pedantic-errors -fdiagnostics-show-option
 LIBRARYFLAGS +=  -Werror -Wall -Wextra -Werror
 EXECUTABLEFLAGS += -Werror -Wall -Wextra