diff --git a/protoscribe/corpus/builder/build_dataset.py b/protoscribe/corpus/builder/build_dataset.py
index ce1822a..2fa9cb2 100644
--- a/protoscribe/corpus/builder/build_dataset.py
+++ b/protoscribe/corpus/builder/build_dataset.py
@@ -238,7 +238,9 @@ def _prepare_language_components() -> None:
   language_dir = os.path.join(output_dir, "language")
   logging.info("Language directory: %s", language_dir)
   if not os.path.exists(language_dir):
-    os.makedirs(language_dir)
+    os.makedirs(
+        language_dir, exist_ok=True
+    )
 
   # Copy these files that are copyable verbatim.
   file_utils.copy_src_file("texts/configs", _NUMBER_CONFIG.value, language_dir)
diff --git a/protoscribe/evolution/make_html.py b/protoscribe/evolution/make_html.py
index 3a09fe2..2897e9c 100644
--- a/protoscribe/evolution/make_html.py
+++ b/protoscribe/evolution/make_html.py
@@ -145,7 +145,9 @@ def make_html() -> None:
   output_svg_dir = os.path.join(_OUTPUT_HTML_DIR.value, "svgs")
   if not os.path.exists(output_svg_dir):
     logging.info("Making directory %s ...", output_svg_dir)
-    os.makedirs(output_svg_dir)
+    os.makedirs(
+        output_svg_dir, exist_ok=True
+    )
 
   # Create index page.
   if not _EXTENSIONS_FILE.value:
diff --git a/protoscribe/evolution/new_spellings_basic_main.py b/protoscribe/evolution/new_spellings_basic_main.py
index f307570..b82fd1b 100644
--- a/protoscribe/evolution/new_spellings_basic_main.py
+++ b/protoscribe/evolution/new_spellings_basic_main.py
@@ -72,7 +72,7 @@ def main(unused_argv):
   # Create a summary of all the extensions in this round.
   output_dir = os.path.join(_DATA_LOCATION.value, "inference_extensions")
   if not os.path.exists(output_dir):
-    os.makedirs(output_dir)
+    os.makedirs(output_dir, exist_ok=True)
   extensions_path = os.path.join(output_dir, "extensions.tsv")
   logging.info("Writing extensions to %s ...", extensions_path)
   with open(extensions_path, "w") as s:
diff --git a/protoscribe/evolution/stages/build_dataset_main.py b/protoscribe/evolution/stages/build_dataset_main.py
index 792d7ec..f83dd86 100644
--- a/protoscribe/evolution/stages/build_dataset_main.py
+++ b/protoscribe/evolution/stages/build_dataset_main.py
@@ -86,7 +86,9 @@ def _setup_builder(round_data_dir: str) -> list[tuple[str, Any]]:
     # language definitions from the previous round.
     logging.info("Making %s ...", round_data_dir)
     language_dir = os.path.join(round_data_dir, "language")
-    os.makedirs(language_dir)
+    os.makedirs(
+        language_dir, exist_ok=True
+    )
     file_utils.copy_dir(
         os.path.join(previous_data_dir, "language"), language_dir
     )
@@ -116,7 +118,9 @@ def _setup_builder(round_data_dir: str) -> list[tuple[str, Any]]:
 
   # At this stage it is safe to do this again.
   if not os.path.isdir(round_data_dir):
-    os.makedirs(round_data_dir)
+    os.makedirs(
+        round_data_dir, exist_ok=True
+    )
   logging.info(
       "Created `%s` for outputs for round %d.", round_data_dir, round_id
   )
diff --git a/protoscribe/evolution/stages/new_spellings_basic_main.py b/protoscribe/evolution/stages/new_spellings_basic_main.py
index 7b1e050..b2299de 100644
--- a/protoscribe/evolution/stages/new_spellings_basic_main.py
+++ b/protoscribe/evolution/stages/new_spellings_basic_main.py
@@ -149,7 +149,10 @@ def main(argv: Sequence[str]) -> None:
         round_data_dir, "glyph_extensions_svg"
     )
     if not os.path.exists(output_glyph_graphics_dir):
-      os.makedirs(output_glyph_graphics_dir)
+      os.makedirs(
+          output_glyph_graphics_dir,
+          exist_ok=True
+      )
     args.extend([
         "--output_glyph_graphics_dir", svg_temp_dir.name
     ])
diff --git a/protoscribe/evolution/stages/sketches_from_jsonl_main.py b/protoscribe/evolution/stages/sketches_from_jsonl_main.py
index 1b220f6..06bf2a0 100644
--- a/protoscribe/evolution/stages/sketches_from_jsonl_main.py
+++ b/protoscribe/evolution/stages/sketches_from_jsonl_main.py
@@ -117,7 +117,9 @@ def _sketches_and_glyphs_for_model_type(
     images_dir = os.path.join(output_dir, "images")
     logging.info("Copying sketches to %s ...", images_dir)
     if not os.path.exists(images_dir):
-      os.makedirs(images_dir)
+      os.makedirs(
+          images_dir, exist_ok=True
+      )
     file_utils.copy_dir(temp_dir_name, images_dir)
 
 
diff --git a/protoscribe/texts/generate_simple_corpus_main.py b/protoscribe/texts/generate_simple_corpus_main.py
index f79fbc2..5d3fbb8 100644
--- a/protoscribe/texts/generate_simple_corpus_main.py
+++ b/protoscribe/texts/generate_simple_corpus_main.py
@@ -88,7 +88,7 @@ def main(argv: Sequence[str]) -> None:
   params_dir = f"{initial_dir}/params"
   concepts_dir = f"{_SRC_DIR}/data/concepts"
   if not os.path.exists(params_dir):
-    os.makedirs(params_dir)
+    os.makedirs(params_dir, exist_ok=True)
 
   # Generate lexicon resources.
   logging.info("Generating the lexicon with ALL concepts in %s ...", params_dir)
@@ -116,7 +116,7 @@ def main(argv: Sequence[str]) -> None:
   # Now generate the accounting texts.
   output_dir = f"{initial_dir}/output"
   if not os.path.exists(output_dir):
-    os.makedirs(output_dir)
+    os.makedirs(output_dir, exist_ok=True)
   for set_idx in range(_NUM_SETS.value):
     logging.info("Generating accounting texts set %d ...", set_idx)
     subprocess_utils.run_subprocess(