diff --git a/pyproject.toml b/pyproject.toml
index 5cdad806..5ada3ccf 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,15 +6,14 @@ authors = ["Alan Orth <aorth@mjanja.ch>", "Marie-Angelique Laporte <m.a.laporte@
 license = "GPL-3.0-only"
 
 [tool.poetry.dependencies]
-python = "^3.9"
-pandas = "^1.3.4"
-ipykernel = "^6.4.2"
-rdflib = "^6.0.2"
+python = "^3.8"
+pandas = "^1.4.0"
+rdflib = "^6.1.1"
 requests = "^2.27.1"
 
 [tool.poetry.dev-dependencies]
-isort = "^5.9.3"
-black = "^21.9b0"
+isort = "^5.10.1"
+black = "^22.1.0"
 csvkit = "^1.0.6"
 
 [build-system]