diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3ddf504..0e17861 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,12 @@
 # Changelog
 
-## [1.2.0](../../releases/tag/v1.2.0) - 2024-12-05
+## [1.2.1](../../releases/tag/v1.2.1) - 2024-12-05
+
+### Changed
+
+- Changed `ACTOR_BUILD_TAGS` to be a comma-separated list variable
+
+## [1.2.0](../../releases/tag/v1.2.0) - 2024-12-04
 
 ### Added
 
diff --git a/pyproject.toml b/pyproject.toml
index b2adbe2..e83408d 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "apify_shared"
-version = "1.2.0"
+version = "1.2.1"
 description = "Tools and constants shared across Apify projects."
 readme = "README.md"
 license = { text = "Apache Software License" }
diff --git a/src/apify_shared/consts.py b/src/apify_shared/consts.py
index 3773339..ad908ce 100644
--- a/src/apify_shared/consts.py
+++ b/src/apify_shared/consts.py
@@ -327,7 +327,6 @@ class MetaOrigin(str, Enum):
     # Actor env vars
     ActorEnvVars.BUILD_ID,
     ActorEnvVars.BUILD_NUMBER,
-    ActorEnvVars.BUILD_TAGS,
     ActorEnvVars.DEFAULT_DATASET_ID,
     ActorEnvVars.DEFAULT_KEY_VALUE_STORE_ID,
     ActorEnvVars.DEFAULT_REQUEST_QUEUE_ID,
@@ -373,3 +372,11 @@ class MetaOrigin(str, Enum):
 ]
 
 STRING_ENV_VARS: list[STRING_ENV_VARS_TYPE] = list(get_args(STRING_ENV_VARS_TYPE))
+
+COMMA_SEPARATED_LIST_ENV_VARS_TYPE = Literal[
+    ActorEnvVars.BUILD_TAGS,
+]
+
+COMMA_SEPARATED_LIST_ENV_VARS: list[COMMA_SEPARATED_LIST_ENV_VARS_TYPE] = list(
+    get_args(COMMA_SEPARATED_LIST_ENV_VARS_TYPE)
+)
diff --git a/tests/unit/test_consts.py b/tests/unit/test_consts.py
index 4da51a2..3874f60 100644
--- a/tests/unit/test_consts.py
+++ b/tests/unit/test_consts.py
@@ -5,6 +5,7 @@
 
 from apify_shared.consts import (
     BOOL_ENV_VARS,
+    COMMA_SEPARATED_LIST_ENV_VARS,
     DATETIME_ENV_VARS,
     FLOAT_ENV_VARS,
     INTEGER_ENV_VARS,
@@ -20,14 +21,28 @@
 class TestConsts:
     def test_env_vars_types_unique(self: TestConsts) -> None:
         """Test that env var types don't contain any item twice."""
-        for env_var_type in [BOOL_ENV_VARS, DATETIME_ENV_VARS, FLOAT_ENV_VARS, INTEGER_ENV_VARS, STRING_ENV_VARS]:
+        for env_var_type in [
+            BOOL_ENV_VARS,
+            COMMA_SEPARATED_LIST_ENV_VARS,
+            DATETIME_ENV_VARS,
+            FLOAT_ENV_VARS,
+            INTEGER_ENV_VARS,
+            STRING_ENV_VARS,
+        ]:
             assert isinstance(env_var_type, list)
             assert len(env_var_type) == len(set(env_var_type))
 
     def test_env_vars_types_do_not_overlap(self: TestConsts) -> None:
         """Test that there is no overlap between env var types."""
         for first, second in itertools.combinations(
-            [BOOL_ENV_VARS, DATETIME_ENV_VARS, FLOAT_ENV_VARS, INTEGER_ENV_VARS, STRING_ENV_VARS],
+            [
+                BOOL_ENV_VARS,
+                COMMA_SEPARATED_LIST_ENV_VARS,
+                DATETIME_ENV_VARS,
+                FLOAT_ENV_VARS,
+                INTEGER_ENV_VARS,
+                STRING_ENV_VARS,
+            ],
             r=2,
         ):
             assert isinstance(first, list)
@@ -38,6 +53,7 @@ def test_env_vars_types_defined_for_all_env_vars(self: TestConsts) -> None:
         """Test that all env vars from `ApifyEnvVars` and `ActorEnvVars` have a defined type."""
         env_vars_from_types = set(
             list(BOOL_ENV_VARS)
+            + list(COMMA_SEPARATED_LIST_ENV_VARS)
             + list(DATETIME_ENV_VARS)
             + list(FLOAT_ENV_VARS)
             + list(INTEGER_ENV_VARS)