diff --git a/pyproject.toml b/pyproject.toml
index 9503a311..22796092 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -27,7 +27,7 @@ classifiers = [
 ]
 
 [tool.poetry.dependencies]
-python = "^3.5"
+python = "^3.6"
 blinker = "^1.4"
 docutils = "^0.16"
 feedgenerator = "^1.9"
@@ -39,23 +39,23 @@ unidecode = "^1.1"
 markdown = {version = "~3.2.2", optional = true}
 
 [tool.poetry.dev-dependencies]
-BeautifulSoup4 = "^4.7"
+BeautifulSoup4 = "^4.9"
 lxml = "^4.3"
 markdown = "~3.2.2"
 typogrify = "^2.0"
 sphinx = "^3.0"
-sphinx_rtd_theme = "^0.4.3"
+sphinx_rtd_theme = "^0.5"
 livereload = "^2.6"
-pytest = "^5.0"
+pytest = "^6.0"
 pytest-cov = "^2.8"
 pytest-pythonpath = "^0.7.3"
-pytest-sugar = "^0.9.3"
+pytest-sugar = "^0.9.4"
 pytest-xdist = "^1.31"
 tox = "^3.13"
-flake8 = "^3.7"
+flake8 = "^3.8"
 flake8-import-order = "^0.18.1"
 invoke = "^1.3"
-isort = "^4.3.21"
+isort = "^5.2"
 black = {version = "^19.10b0", allow-prereleases = true}
 
 [tool.poetry.extras]