diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d9f98d8..47d9a6a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,8 +22,6 @@
         include:
           - compiler: g++-7
             os: ubuntu-18.04
-          - compiler: clang++-5.0
-            os: ubuntu-18.04
           - compiler: clang++-6.0
             os: ubuntu-18.04
     runs-on: ${{ matrix.os }}
@@ -37,7 +35,7 @@
           sudo apt-get -qy install ${CXX/clang++/clang}
           ${CXX} --version
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Build and test
         run: ./.jenkins
 
@@ -63,6 +61,6 @@
         with:
           xcode-version: ${{ matrix.xcode }}
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
       - name: Build and test
         run: ./.jenkins
diff --git a/.waf-tools/default-compiler-flags.py b/.waf-tools/default-compiler-flags.py
index f3be6e7..f086c17 100644
--- a/.waf-tools/default-compiler-flags.py
+++ b/.waf-tools/default-compiler-flags.py
@@ -16,20 +16,21 @@
     errmsg = ''
     warnmsg = ''
     if cxx == 'gcc':
-        if ccver < (5, 3, 0):
+        if ccver < (7, 4, 0):
             errmsg = ('The version of gcc you are using is too old.\n'
-                      'The minimum supported gcc version is 7.4.0.')
-        elif ccver < (7, 4, 0):
-            warnmsg = ('Using a version of gcc older than 7.4.0 is not '
-                       'officially supported and may result in build failures.')
+                      'The minimum supported gcc version is 7.4.')
         conf.flags = GccFlags()
     elif cxx == 'clang':
-        if Utils.unversioned_sys_platform() == 'darwin' and ccver < (9, 0, 0):
-            errmsg = ('The version of Xcode you are using is too old.\n'
-                      'The minimum supported Xcode version is 9.0.')
-        elif ccver < (4, 0, 0):
+        if Utils.unversioned_sys_platform() == 'darwin':
+            if ccver < (10, 0, 0):
+                errmsg = ('The version of Xcode you are using is too old.\n'
+                          'The minimum supported Xcode version is 11.3.')
+            elif ccver < (11, 0, 0):
+                warnmsg = ('Using a version of Xcode older than 11.3 is not '
+                           'officially supported and may result in build failures.')
+        elif ccver < (6, 0, 0):
             errmsg = ('The version of clang you are using is too old.\n'
-                      'The minimum supported clang version is 4.0.')
+                      'The minimum supported clang version is 6.0.')
         conf.flags = ClangFlags()
     else:
         warnmsg = '%s compiler is unsupported' % cxx
@@ -181,7 +182,7 @@
         flags['CXXFLAGS'] += ['-fdiagnostics-color',
                               '-Wredundant-tags',
                               ]
-        if platform.machine() == 'armv7l' and self.getCompilerVersion(conf) >= (7, 1, 0):
+        if platform.machine() == 'armv7l':
             flags['CXXFLAGS'] += ['-Wno-psabi'] # Bug #5106
         return flags
 
@@ -190,7 +191,7 @@
         flags['CXXFLAGS'] += ['-fdiagnostics-color',
                               '-Wredundant-tags',
                               ]
-        if platform.machine() == 'armv7l' and self.getCompilerVersion(conf) >= (7, 1, 0):
+        if platform.machine() == 'armv7l':
             flags['CXXFLAGS'] += ['-Wno-psabi'] # Bug #5106
         return flags
 
@@ -212,8 +213,6 @@
                               '-Wundefined-func-template',
                               '-Wno-unused-local-typedef', # Bugs #2657 and #3209
                               ]
-        if self.getCompilerVersion(conf) < (6, 0, 0):
-            flags['CXXFLAGS'] += ['-Wno-missing-braces'] # Bug #4721
         return flags
 
     def getOptimizedFlags(self, conf):
@@ -222,6 +221,4 @@
                               '-Wundefined-func-template',
                               '-Wno-unused-local-typedef', # Bugs #2657 and #3209
                               ]
-        if self.getCompilerVersion(conf) < (6, 0, 0):
-            flags['CXXFLAGS'] += ['-Wno-missing-braces'] # Bug #4721
         return flags
diff --git a/tests/global-configuration.cpp b/tests/global-configuration.cpp
index 0c92646..e526936 100644
--- a/tests/global-configuration.cpp
+++ b/tests/global-configuration.cpp
@@ -1,6 +1,6 @@
 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
 /*
- * Copyright (c) 2017-2021, Regents of the University of California.
+ * Copyright (c) 2017-2022, Regents of the University of California.
  *
  * This file is part of ndncert, a certificate management system based on NDN.
  *
@@ -61,13 +61,7 @@
   std::string m_home;
 };
 
-#if BOOST_VERSION >= 106500
 BOOST_TEST_GLOBAL_CONFIGURATION(GlobalConfiguration);
-#elif BOOST_VERSION >= 105900
-BOOST_GLOBAL_FIXTURE(GlobalConfiguration);
-#else
-BOOST_GLOBAL_FIXTURE(GlobalConfiguration)
-#endif
 
 } // namespace tests
 } // namespace ndncert