diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f267e847..6d02a5e7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -51,8 +51,18 @@ jobs:
         with:
           python-version: ${{ steps.python_version.outputs.value }}
 
+      - name: Get supported Poetry version
+        uses: haya14busa/action-cond@v1
+        id: poetry_version
+        with:
+          cond: ${{ startsWith(matrix.pyspark-version, '2.') }}
+          if_true: '1.5'  # latest supported version for PySpark 2.x
+          if_false: '1.6'  # PySpark 3+
+
       - name: Install Poetry
         uses: snok/install-poetry@v1
+        with:
+          version: ${{ steps.poetry_version.outputs.value }}
 
       - name: Cache Poetry virtualenv
         uses: actions/cache@v1
diff --git a/README.md b/README.md
index 18c63a9c..59bb3a71 100644
--- a/README.md
+++ b/README.md
@@ -1,8 +1,7 @@
 # Quinn
 
 ![![image](https://github.com/MrPowers/quinn/workflows/build/badge.svg)](https://github.com/MrPowers/quinn/actions/workflows/ci.yml/badge.svg)
-<!-- ![![image](https://github.com/MrPowers/mack/workflows/build/badge.svg)](https://github.com/MrPowers/quinn/actions/workflows/flake8.yml/badge.svg) -->
-[![Linter: Ruff](https://img.shields.io/badge/Linter-Ruff-brightgreen?style=flat-square)](https://github.com/MrPowers/quinn/actions/workflows/ruff.yml/badge.svg)
+[![image](https://github.com/MrPowers/quinn/workflows/build/badge.svg)](https://github.com/MrPowers/quinn/actions/workflows/ruff.yml/badge.svg)
 ![PyPI - Downloads](https://img.shields.io/pypi/dm/quinn)
 [![PyPI version](https://badge.fury.io/py/quinn.svg)](https://badge.fury.io/py/quinn)
 
diff --git a/tests/test_dataframe_validator.py b/tests/test_dataframe_validator.py
index b56fb2eb..b30f3f3a 100644
--- a/tests/test_dataframe_validator.py
+++ b/tests/test_dataframe_validator.py
@@ -37,10 +37,10 @@ def it_raises_when_struct_field_is_missing1(spark):
         with pytest.raises(quinn.DataFrameMissingStructFieldError) as excinfo:
             quinn.validate_schema(source_df, required_schema)
 
-        if semver.compare(spark.version, "3.2.0") >= 0:  # Spark 3.3+
+        if semver.compare(spark.version, "3.3.0") >= 0:  # Spark 3.3+
             expected_error_message = "The [StructField('city', StringType(), True)] StructFields are not included in the DataFrame with the following StructFields StructType([StructField('name', StringType(), True), StructField('age', LongType(), True)])" # noqa
         else:
-            expected_error_message = "The [StructField(city,StringType,true)] StructFields are not included in the DataFrame with the following StructFields StructType(List(StructField(name,StringType,true), StructField(age,LongType,true)))" # noqa
+            expected_error_message = "The [StructField(city,StringType,true)] StructFields are not included in the DataFrame with the following StructFields StructType(List(StructField(name,StringType,true),StructField(age,LongType,true)))" # noqa
         assert excinfo.value.args[0] == expected_error_message
 
     def it_does_nothing_when_the_schema_matches(spark):