diff --git a/api_compatibility_tests/tox.ini b/api_compatibility_tests/tox.ini
index 5c9c4e6..ce13249 100644
--- a/api_compatibility_tests/tox.ini
+++ b/api_compatibility_tests/tox.ini
@@ -1,6 +1,6 @@
 [tox]
 envlist =
-    py{3,38}-awses_cli_{1.7.0,1.8.0,1.9.0,2.0.0,2.1.0,2.2.0,3.0.0,3.1.0,3.1.2,4.0.0,4.1.0,4.2.0}
+    py{3,38}-awses_cli_{1.7.0,1.8.0,1.9.0,2.0.0,2.1.0,2.2.0,3.0.0,3.1.0,3.1.2,4.0.0,4.1.0,4.2.0,4.3.0}
 
 [testenv:base-command]
 commands = pytest --basetemp={envtmpdir} -l test/ {posargs}
@@ -37,6 +37,7 @@ deps =
     awses_cli_4.0.0: -rcompatibility-requirements/4.0.0
     awses_cli_4.1.0: -rcompatibility-requirements/4.1.0
     awses_cli_4.2.0: -rcompatibility-requirements/4.2.0
+    awses_cli_4.2.0: -rcompatibility-requirements/4.3.0
     awses_cli_local: -e {env:AWSES_CLI_LOCAL_PATH}
 commands = 
     {[testenv:base-command]commands}
diff --git a/src/aws_encryption_sdk_cli/internal/identifiers.py b/src/aws_encryption_sdk_cli/internal/identifiers.py
index 83729a3..ddea41a 100644
--- a/src/aws_encryption_sdk_cli/internal/identifiers.py
+++ b/src/aws_encryption_sdk_cli/internal/identifiers.py
@@ -31,7 +31,7 @@
     "DEFAULT_MASTER_KEY_PROVIDER",
     "OperationResult",
 )
-__version__ = "4.2.0"  # type: str
+__version__ = "4.3.0"  # type: str
 
 #: Suffix added to output files if specific output filename is not specified.
 OUTPUT_SUFFIX = {