diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 95fb05e..ef0fb02 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
 
     steps:
     - uses: actions/checkout@v2
diff --git a/README.md b/README.md
index cb665fe..c718953 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,8 @@
 
 This repository implements a causal feature selection algorithm based on transfer entropy. The algorithm is described in [TODO: Add reference].
 
+Requires Python 3.9 or later.
+
 ## Installation
 
 The package can be installed using pip: