diff --git a/easybuild/framework/easyblock.py b/easybuild/framework/easyblock.py
index 31974acfa8..e2a4a0ab14 100644
--- a/easybuild/framework/easyblock.py
+++ b/easybuild/framework/easyblock.py
@@ -533,14 +533,6 @@ def fetch_patches(self, patch_specs=None, extension=False, checksums=None):
         else:
             self.log.info("Added patches: %s", self.patches)
 
-    def fetch_extension_sources(self, skip_checksums=False):
-        """
-        Fetch source and patch files for extensions (DEPRECATED, use collect_exts_file_info instead).
-        """
-        depr_msg = "EasyBlock.fetch_extension_sources is deprecated, use EasyBlock.collect_exts_file_info instead"
-        self.log.deprecated(depr_msg, '5.0')
-        return self.collect_exts_file_info(fetch_files=True, verify_checksums=not skip_checksums)
-
     def collect_exts_file_info(self, fetch_files=True, verify_checksums=True):
         """
         Collect information on source and patch files for extensions.
diff --git a/easybuild/framework/easyconfig/easyconfig.py b/easybuild/framework/easyconfig/easyconfig.py
index 1c6559284b..b0704ca11a 100644
--- a/easybuild/framework/easyconfig/easyconfig.py
+++ b/easybuild/framework/easyconfig/easyconfig.py
@@ -776,7 +776,7 @@ def count_files(self):
         for ext in self['exts_list']:
             if isinstance(ext, tuple) and len(ext) >= 3:
                 ext_opts = ext[2]
-                # check for 'sources' first, since that's also considered first by EasyBlock.fetch_extension_sources
+                # check for 'sources' first, since that's also considered first by EasyBlock.collect_exts_file_info
                 if 'sources' in ext_opts:
                     cnt += len(ext_opts['sources'])
                 elif 'source_tmpl' in ext_opts:
diff --git a/test/framework/easyblock.py b/test/framework/easyblock.py
index d92e0e9d3d..818d060f3f 100644
--- a/test/framework/easyblock.py
+++ b/test/framework/easyblock.py
@@ -2443,13 +2443,6 @@ def test_checksum_step(self):
         error_msg = "Checksum verification for extension source bar-0.0.tar.gz failed"
         self.assertErrorRegex(EasyBuildError, error_msg, eb.collect_exts_file_info)
 
-        # also check with deprecated fetch_extension_sources method
-        self.allow_deprecated_behaviour()
-        self.mock_stderr(True)
-        self.assertErrorRegex(EasyBuildError, error_msg, eb.fetch_extension_sources)
-        self.mock_stderr(False)
-        self.disallow_deprecated_behaviour()
-
         # create test easyconfig from which checksums have been stripped
         test_ec = os.path.join(self.test_prefix, 'test.eb')
         ectxt = read_file(toy_ec)
@@ -2497,17 +2490,10 @@ def test_checksum_step(self):
         error_msg = "Checksum verification for .*/toy-0.0.tar.gz using .* failed"
         self.assertErrorRegex(EasyBuildError, error_msg, eb.checksum_step)
 
-        # also check verification of checksums for extensions, which is part of fetch_extension_sources
+        # also check verification of checksums for extensions, which is part of collect_exts_file_info
         error_msg = "Checksum verification for extension source bar-0.0.tar.gz failed"
         self.assertErrorRegex(EasyBuildError, error_msg, eb.collect_exts_file_info)
 
-        # also check with deprecated fetch_extension_sources method
-        self.allow_deprecated_behaviour()
-        self.mock_stderr(True)
-        self.assertErrorRegex(EasyBuildError, error_msg, eb.fetch_extension_sources)
-        self.mock_stderr(False)
-        self.disallow_deprecated_behaviour()
-
         # if --ignore-checksums is enabled, faulty checksums are reported but otherwise ignored (no error)
         build_options = {
             'ignore_checksums': True,
@@ -2534,19 +2520,6 @@ def test_checksum_step(self):
         self.assertEqual(stdout, '')
         self.assertEqual(stderr.strip(), "WARNING: Ignoring failing checksum verification for bar-0.0.tar.gz")
 
-        # also check with deprecated fetch_extension_sources method
-        self.allow_deprecated_behaviour()
-        self.mock_stderr(True)
-        self.mock_stdout(True)
-        eb.fetch_extension_sources()
-        stderr = self.get_stderr()
-        stdout = self.get_stdout()
-        self.mock_stderr(False)
-        self.mock_stdout(False)
-        self.assertEqual(stdout, '')
-        self.assertTrue(stderr.strip().endswith("WARNING: Ignoring failing checksum verification for bar-0.0.tar.gz"))
-        self.disallow_deprecated_behaviour()
-
     def test_check_checksums(self):
         """Test for check_checksums_for and check_checksums methods."""
         testdir = os.path.abspath(os.path.dirname(__file__))
diff --git a/test/framework/easyconfig.py b/test/framework/easyconfig.py
index c99039bcbd..7c83a15f75 100644
--- a/test/framework/easyconfig.py
+++ b/test/framework/easyconfig.py
@@ -4710,7 +4710,7 @@ def test_count_files(self):
             '    ("test-ext-one", "0.0", {',
             '        "sources": ["test-ext-one-0.0-part1.tgz", "test-ext-one-0.0-part2.zip"],',
             # if both 'sources' and 'source_tmpl' are specified, 'source_tmpl' is ignored,
-            # see EasyBlock.fetch_extension_sources, so it should be too when counting files
+            # see EasyBlock.collect_exts_file_info, so it should be too when counting files
             '        "source_tmpl": "test-ext-one-%(version)s.tar.gz",',
             '    }),',
             '    ("test-ext-two", "0.0", {',