diff --git a/pyproject.toml b/pyproject.toml
index 83256bf..7533cdd 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ py-tes = "^0.4.2"
 black = "^23.9.1"
 flake8 = "^6.1.0"
 coverage = "^7.3.1"
-pytest = "^7.4.2"
+pytest = ">=7.4.2,<9.0.0"
 snakemake = {git = "https://github.com/snakemake/snakemake.git"}
 snakemake-storage-plugin-s3 = "^0.2.7"