diff --git a/harness/constants.py b/harness/constants.py
index 874dec86..8635b05b 100644
--- a/harness/constants.py
+++ b/harness/constants.py
@@ -165,6 +165,7 @@
         "python": "3.9",
         "packages": "environment.yml",
         "install": "python -m pip install -e .",
+        "pip_packages": "pytest",
     }
     for k in ["3.5", "3.6", "3.7"]
 }
@@ -174,6 +175,7 @@
             "python": "3.8",
             "packages": "requirements.txt",
             "install": "python -m pip install -e .",
+            "pip_packages": "pytest"
         }
         for k in ["3.1", "3.2", "3.3", "3.4"]
     }
@@ -184,6 +186,7 @@
             "python": "3.7",
             "packages": "requirements.txt",
             "install": "python -m pip install -e .",
+            "pip_packages": "pytest",
         }
         for k in ["3.0"]
     }
@@ -193,6 +196,7 @@
         k: {
             "python": "3.5",
             "install": "python setup.py build; python setup.py install",
+            "pip_packages": "pytest",
         }
         for k in ["2.0", "2.1", "2.2", "1.0", "1.1", "1.2", "1.3", "1.4", "1.5"]
     }
@@ -472,4 +476,4 @@
 
 # Constants - Miscellaneous
 NON_TEST_EXTS = [".json", ".png", "csv", ".txt", ".md", ".jpg", ".jpeg", ".pkl", ".yml", ".yaml", ".toml"]
-SWE_BENCH_URL_RAW = "https://raw.githubusercontent.com/"
\ No newline at end of file
+SWE_BENCH_URL_RAW = "https://raw.githubusercontent.com/"