diff --git a/conda_build/build.py b/conda_build/build.py
index ae2c79983f..790ebecd40 100644
--- a/conda_build/build.py
+++ b/conda_build/build.py
@@ -924,7 +924,7 @@ def copy_test_source_files(m, destination):
                         )
                     except OSError as e:
                         log = utils.get_logger(__name__)
-                        log.warn(
+                        log.warning(
                             f"Failed to copy {f} into test files.  Error was: {str(e)}"
                         )
                 for ext in ".pyc", ".pyo":
@@ -1816,7 +1816,7 @@ def bundle_conda(output, metadata: MetaData, env, stats, **kw):
         }
     elif not output.get("script"):
         if not metadata.always_include_files():
-            log.warn(
+            log.warning(
                 "No files or script found for output {}".format(output.get("name"))
             )
             build_deps = metadata.get_value("requirements/build")
@@ -1854,7 +1854,9 @@ def bundle_conda(output, metadata: MetaData, env, stats, **kw):
                 initial_files.remove(f)
                 has_matches = True
         if not has_matches:
-            log.warn("Glob %s from always_include_files does not match any files", pat)
+            log.warning(
+                "Glob %s from always_include_files does not match any files", pat
+            )
     files = post_process_files(metadata, initial_files)
 
     if output.get("name") and output.get("name") != "conda":
@@ -1913,7 +1915,7 @@ def bundle_conda(output, metadata: MetaData, env, stats, **kw):
                 from conda_verify.verify import Verify
             except ImportError:
                 Verify = None
-                log.warn(
+                log.warning(
                     "Importing conda-verify failed.  Please be sure to test your packages.  "
                     "conda install conda-verify to make this message go away."
                 )
@@ -1930,7 +1932,7 @@ def bundle_conda(output, metadata: MetaData, env, stats, **kw):
                         exit_on_error=metadata.config.exit_on_verify_error,
                     )
                 except KeyError as e:
-                    log.warn(
+                    log.warning(
                         "Package doesn't have necessary files.  It might be too old to inspect."
                         f"Legacy noarch packages are known to fail.  Full message was {e}"
                     )
@@ -2157,7 +2159,7 @@ def _write_activation_text(script_path, m):
             _write_sh_activation_text(fh, m)
         else:
             log = utils.get_logger(__name__)
-            log.warn(
+            log.warning(
                 f"not adding activation to {script_path} - I don't know how to do so for "
                 "this file type"
             )
@@ -2375,7 +2377,7 @@ def build(
                 ):
                     specs.append(vcs_source)
 
-                    log.warn(
+                    log.warning(
                         "Your recipe depends on %s at build time (for templates), "
                         "but you have not listed it as a build dependency.  Doing "
                         "so for this build.",
@@ -2837,7 +2839,7 @@ def _construct_metadata_for_test_from_recipe(recipe_dir, config):
         render_recipe(recipe_dir, config=config, reset_build_id=False)
     )[0][1]
     log = utils.get_logger(__name__)
-    log.warn(
+    log.warning(
         "Testing based on recipes is deprecated as of conda-build 3.16.0.  Please adjust "
         "your code to pass your desired conda package to test instead."
     )
@@ -2887,7 +2889,7 @@ def _construct_metadata_for_test_from_package(package, config):
             is_channel = True
 
     if not is_channel:
-        log.warn(
+        log.warning(
             "Copying package to conda-build croot.  No packages otherwise alongside yours will"
             " be available unless you specify -c local.  To avoid this warning, your package "
             "must reside in a channel structure with platform-subfolders.  See more info on "
@@ -3141,7 +3143,7 @@ def _write_test_run_script(
                         tf.write(f'call "{shell_file}"\n')
                         tf.write("IF %ERRORLEVEL% NEQ 0 exit /B 1\n")
                     else:
-                        log.warn(
+                        log.warning(
                             "Found sh test file on windows.  Ignoring this for now (PRs welcome)"
                         )
                 elif os.path.splitext(shell_file)[1] == ".sh":
@@ -3326,7 +3328,7 @@ def test(
             # Needs to come after create_files in case there's test/source_files
             shutil_move_more_retrying(config.work_dir, dest, "work")
     else:
-        log.warn(
+        log.warning(
             "Not moving work directory after build.  Your package may depend on files "
             "in the work directory that are not included with your package"
         )
@@ -3390,7 +3392,7 @@ def test(
         CondaError,
         AssertionError,
     ) as exc:
-        log.warn(
+        log.warning(
             "failed to get package records, retrying.  exception was: %s", str(exc)
         )
         tests_failed(
@@ -3517,7 +3519,7 @@ def tests_failed(package_or_metadata, move_broken, broken_dir, config):
         log = utils.get_logger(__name__)
         try:
             shutil.move(pkg, dest)
-            log.warn(
+            log.warning(
                 f"Tests failed for {os.path.basename(pkg)} - moving package to {broken_dir}"
             )
         except OSError:
@@ -3687,7 +3689,7 @@ def build_tree(
                             # downstreams can be a dict, for adding capability for worker labels
                             if hasattr(downstreams, "keys"):
                                 downstreams = list(downstreams.keys())
-                                log.warn(
+                                log.warning(
                                     "Dictionary keys for downstreams are being "
                                     "ignored right now.  Coming soon..."
                                 )
@@ -3726,7 +3728,7 @@ def build_tree(
                                     UnsatisfiableError,
                                     DependencyNeedsBuildingError,
                                 ) as e:
-                                    log.warn(
+                                    log.warning(
                                         f"Skipping downstream test for spec {dep}; was "
                                         f"unsatisfiable.  Error was {e}"
                                     )
diff --git a/conda_build/config.py b/conda_build/config.py
index 8e444c1a42..86fbe438d1 100644
--- a/conda_build/config.py
+++ b/conda_build/config.py
@@ -324,7 +324,7 @@ def arch(self):
     @arch.setter
     def arch(self, value):
         log = get_logger(__name__)
-        log.warn(
+        log.warning(
             "Setting build arch. This is only useful when pretending to be on another "
             "arch, such as for rendering necessary dependencies on a non-native arch. "
             "I trust that you know what you're doing."
@@ -340,7 +340,7 @@ def platform(self):
     @platform.setter
     def platform(self, value):
         log = get_logger(__name__)
-        log.warn(
+        log.warning(
             "Setting build platform. This is only useful when "
             "pretending to be on another platform, such as "
             "for rendering necessary dependencies on a non-native "
diff --git a/conda_build/environ.py b/conda_build/environ.py
index 0ce38d1668..3113ec7f8a 100644
--- a/conda_build/environ.py
+++ b/conda_build/environ.py
@@ -902,7 +902,7 @@ def get_install_actions(
                     BuildLockError,
                 ) as exc:
                     if "lock" in str(exc):
-                        log.warn(
+                        log.warning(
                             "failed to get package records, retrying.  exception was: %s",
                             str(exc),
                         )
@@ -923,7 +923,7 @@ def get_install_actions(
                             ):
                                 pkg_dir = os.path.dirname(pkg_dir)
                                 folder += 1
-                            log.warn(
+                            log.warning(
                                 "I think conda ended up with a partial extraction for %s. "
                                 "Removing the folder and retrying",
                                 pkg_dir,
@@ -931,7 +931,7 @@ def get_install_actions(
                             if pkg_dir in context.pkgs_dirs and os.path.isdir(pkg_dir):
                                 utils.rm_rf(pkg_dir)
                     if retries < max_env_retry:
-                        log.warn(
+                        log.warning(
                             "failed to get package records, retrying.  exception was: %s",
                             str(exc),
                         )
@@ -1064,20 +1064,20 @@ def create_env(
                     or isinstance(exc, PaddingError)
                 ) and config.prefix_length > 80:
                     if config.prefix_length_fallback:
-                        log.warn(
+                        log.warning(
                             "Build prefix failed with prefix length %d",
                             config.prefix_length,
                         )
-                        log.warn("Error was: ")
-                        log.warn(str(exc))
-                        log.warn(
+                        log.warning("Error was: ")
+                        log.warning(str(exc))
+                        log.warning(
                             "One or more of your package dependencies needs to be rebuilt "
                             "with a longer prefix length."
                         )
-                        log.warn(
+                        log.warning(
                             "Falling back to legacy prefix length of 80 characters."
                         )
-                        log.warn(
+                        log.warning(
                             "Your package will not install into prefixes > 80 characters."
                         )
                         config.prefix_length = 80
@@ -1099,7 +1099,7 @@ def create_env(
                         raise
                 elif "lock" in str(exc):
                     if retry < config.max_env_retry:
-                        log.warn(
+                        log.warning(
                             "failed to create env, retrying.  exception was: %s",
                             str(exc),
                         )
@@ -1125,7 +1125,7 @@ def create_env(
                         ):
                             pkg_dir = os.path.dirname(pkg_dir)
                             folder += 1
-                        log.warn(
+                        log.warning(
                             "I think conda ended up with a partial extraction for %s.  "
                             "Removing the folder and retrying",
                             pkg_dir,
@@ -1133,7 +1133,7 @@ def create_env(
                         if os.path.isdir(pkg_dir):
                             utils.rm_rf(pkg_dir)
                     if retry < config.max_env_retry:
-                        log.warn(
+                        log.warning(
                             "failed to create env, retrying.  exception was: %s",
                             str(exc),
                         )
@@ -1164,7 +1164,7 @@ def create_env(
                 if isinstance(exc, AssertionError):
                     with utils.try_acquire_locks(locks, timeout=config.timeout):
                         pkg_dir = os.path.dirname(os.path.dirname(str(exc)))
-                        log.warn(
+                        log.warning(
                             "I think conda ended up with a partial extraction for %s.  "
                             "Removing the folder and retrying",
                             pkg_dir,
@@ -1172,7 +1172,7 @@ def create_env(
                         if os.path.isdir(pkg_dir):
                             utils.rm_rf(pkg_dir)
                 if retry < config.max_env_retry:
-                    log.warn(
+                    log.warning(
                         "failed to create env, retrying.  exception was: %s", str(exc)
                     )
                     create_env(
diff --git a/conda_build/metadata.py b/conda_build/metadata.py
index 3b29e70d4c..d41e81a6db 100644
--- a/conda_build/metadata.py
+++ b/conda_build/metadata.py
@@ -1127,7 +1127,7 @@ def finalize_outputs_pass(
                 raise
             else:
                 log = utils.get_logger(__name__)
-                log.warn(
+                log.warning(
                     "Could not finalize metadata due to missing dependencies: "
                     f"{e.packages}"
                 )
@@ -1348,7 +1348,7 @@ def parse_again(
 
         log = utils.get_logger(__name__)
         if kw:
-            log.warn(
+            log.warning(
                 "using unsupported internal conda-build function `parse_again`.  Please use "
                 "conda_build.api.render instead."
             )
@@ -1562,7 +1562,7 @@ def get_value(self, name, default=None, autotype=True):
             # is passed in with an index, e.g. get_value('source/0/git_url')
             if index is None:
                 log = utils.get_logger(__name__)
-                log.warn(
+                log.warning(
                     f"No index specified in get_value('{name}'). Assuming index 0."
                 )
                 index = 0
@@ -3019,7 +3019,7 @@ def _get_used_vars_output_script(self):
                 )
             else:
                 log = utils.get_logger(__name__)
-                log.warn(
+                log.warning(
                     f"Not detecting used variables in output script {script}; conda-build only knows "
                     "how to search .sh and .bat files right now."
                 )
diff --git a/conda_build/os_utils/macho.py b/conda_build/os_utils/macho.py
index 17fc5d5a13..8e02c8ee86 100644
--- a/conda_build/os_utils/macho.py
+++ b/conda_build/os_utils/macho.py
@@ -258,7 +258,7 @@ def _chmod(filename, mode):
         os.chmod(filename, mode)
     except (OSError, utils.PermissionError) as e:
         log = utils.get_logger(__name__)
-        log.warn(str(e))
+        log.warning(str(e))
 
 
 def install_name_tool(args, build_prefix=None, verbose=False):
diff --git a/conda_build/post.py b/conda_build/post.py
index 67c6a355a7..7ed419eebf 100644
--- a/conda_build/post.py
+++ b/conda_build/post.py
@@ -1595,7 +1595,7 @@ def post_process_shared_lib(m, f, files, host_prefix=None):
     elif codefile == machofile:
         if m.config.host_platform != "osx":
             log = utils.get_logger(__name__)
-            log.warn(
+            log.warning(
                 "Found Mach-O file but patching is only supported on macOS, skipping: %s",
                 path,
             )
@@ -1631,7 +1631,7 @@ def fix_permissions(files, prefix):
                 lchmod(path, new_mode)
             except (OSError, utils.PermissionError) as e:
                 log = utils.get_logger(__name__)
-                log.warn(str(e))
+                log.warning(str(e))
 
 
 def check_menuinst_json(files, prefix) -> None:
diff --git a/conda_build/render.py b/conda_build/render.py
index cc3bcd87c0..919e33ef1e 100644
--- a/conda_build/render.py
+++ b/conda_build/render.py
@@ -739,14 +739,14 @@ def finalize_metadata(
         if build_unsat or host_unsat:
             m.final = False
             log = utils.get_logger(__name__)
-            log.warn(
+            log.warning(
                 f"Returning non-final recipe for {m.dist()}; one or more dependencies "
                 "was unsatisfiable:"
             )
             if build_unsat:
-                log.warn(f"Build: {build_unsat}")
+                log.warning(f"Build: {build_unsat}")
             if host_unsat:
-                log.warn(f"Host: {host_unsat}")
+                log.warning(f"Host: {host_unsat}")
         else:
             m.final = True
     if is_top_level:
diff --git a/conda_build/source.py b/conda_build/source.py
index 903f5d7ca0..983188dd5a 100644
--- a/conda_build/source.py
+++ b/conda_build/source.py
@@ -74,7 +74,7 @@ def download_to_cache(cache_folder, recipe_path, source_dict, verbose=False):
             hash_added = True
             break
     else:
-        log.warn(
+        log.warning(
             f"No hash (md5, sha1, sha256) provided for {unhashed_fn}.  Source download forced.  "
             "Add hash to recipe to use source cache."
         )
@@ -102,10 +102,10 @@ def download_to_cache(cache_folder, recipe_path, source_dict, verbose=False):
                 with LoggingContext():
                     download(url, path)
             except CondaHTTPError as e:
-                log.warn(f"Error: {str(e).strip()}")
+                log.warning(f"Error: {str(e).strip()}")
                 rm_rf(path)
             except RuntimeError as e:
-                log.warn(f"Error: {str(e).strip()}")
+                log.warning(f"Error: {str(e).strip()}")
                 rm_rf(path)
             else:
                 if verbose:
@@ -467,7 +467,7 @@ def git_info(src_dir, build_prefix, git=None, verbose=True, fo=None):
     if not git:
         git = external.find_executable("git", build_prefix)
     if not git:
-        log.warn(
+        log.warning(
             "git not installed in root environment.  Skipping recording of git info."
         )
         return
diff --git a/conda_build/utils.py b/conda_build/utils.py
index a2c456c66e..17d1c1f031 100644
--- a/conda_build/utils.py
+++ b/conda_build/utils.py
@@ -257,8 +257,8 @@ def _execute(self, *args, **kwargs):
             psutil = None
             psutil_exceptions = (OSError, ValueError)
             log = get_logger(__name__)
-            log.warn(f"psutil import failed.  Error was {e}")
-            log.warn(
+            log.warning(f"psutil import failed.  Error was {e}")
+            log.warning(
                 "only disk usage and time statistics will be available.  Install psutil to "
                 "get CPU time and memory usage statistics."
             )
@@ -594,7 +594,7 @@ def copy_into(
                 src_folder = os.getcwd()
 
         if os.path.islink(src) and not os.path.exists(os.path.realpath(src)):
-            log.warn("path %s is a broken symlink - ignoring copy", src)
+            log.warning("path %s is a broken symlink - ignoring copy", src)
             return
 
         if not lock and locking:
@@ -1890,7 +1890,7 @@ def ensure_valid_spec(spec: str | MatchSpec, warn: bool = False) -> str | MatchS
                 if "*" not in spec:
                     if match.group(1) not in ("python", "vc") and warn:
                         log = get_logger(__name__)
-                        log.warn(
+                        log.warning(
                             f"Adding .* to spec '{spec}' to ensure satisfiability.  Please "
                             "consider putting {{{{ var_name }}}}.* or some relational "
                             "operator (>/</>=/<=) on this spec in meta.yaml, or if req is "
diff --git a/conda_build/windows.py b/conda_build/windows.py
index 00287c50bf..8643431a5b 100644
--- a/conda_build/windows.py
+++ b/conda_build/windows.py
@@ -102,16 +102,16 @@ def msvc_env_cmd(bits, config, override=None):
     # there's clear user demand, it's not clear that we should invest the
     # effort into updating a known deprecated function for a new platform.
     log = get_logger(__name__)
-    log.warn(
+    log.warning(
         "Using legacy MSVC compiler setup.  This will be removed in conda-build 4.0. "
         "If this recipe does not use a compiler, this message is safe to ignore.  "
         "Otherwise, use {{compiler('<language>')}} jinja2 in requirements/build."
     )
     if bits not in ["64", "32"]:
-        log.warn(f"The legacy MSVC compiler setup does not support {bits} builds. ")
+        log.warning(f"The legacy MSVC compiler setup does not support {bits} builds. ")
         return ""
     if override:
-        log.warn(
+        log.warning(
             "msvc_compiler key in meta.yaml is deprecated. Use the new"
             "variant-powered compiler configuration instead. Note that msvc_compiler"
             "is incompatible with the new {{{{compiler('c')}}}} jinja scheme."
diff --git a/tests/test_utils.py b/tests/test_utils.py
index 70a2981203..98733546b5 100644
--- a/tests/test_utils.py
+++ b/tests/test_utils.py
@@ -163,7 +163,7 @@ def test_logger_filtering(caplog, capfd):
     log.info("test info message")
     log.info("test duplicate message")
     log.info("test duplicate message")
-    log.warn("test warn message")
+    log.warning("test warn message")
     log.error("test error message")
     out, err = capfd.readouterr()
     assert "test debug message" in out
@@ -211,7 +211,7 @@ def test_logger_config_from_file(testing_workdir, capfd, mocker):
     )
     log = utils.get_logger(__name__)
     # default log level is INFO, but our config file should set level to DEBUG
-    log.warn("test message")
+    log.warning("test message")
     # output should have gone to stdout according to config above.
     out, err = capfd.readouterr()
     assert "test message" in out