diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 59e4336..07010dd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -83,7 +83,7 @@ jobs:
         if: github.ref_name == 'main' || startsWith(github.ref, 'refs/heads/wiblum')
 
       - name: Archive milled notebooks
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: papermilled-notebooks
           path: |
diff --git a/requirements.dev.txt b/requirements.dev.txt
index c819c83..db7ef38 100644
--- a/requirements.dev.txt
+++ b/requirements.dev.txt
@@ -80,7 +80,7 @@ jupyterlab-widgets==3.0.9
 kiwisolver==1.4.5
 markdown-it-py==2.2.0
 markupsafe==2.1.3
-matplotlib==3.6.3
+matplotlib>=3.9.4
 matplotlib-inline==0.1.6
 mccabe==0.7.0
 mistune==3.0.2
diff --git a/requirements.txt b/requirements.txt
index 5a5fa09..32029cd 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,11 +1,11 @@
 setuptools~=70.0.0
 wheel===0.44.0
 gymnasium==0.29.1
-numpy==1.23.0
+numpy==1.26.4
 boolean.py==4.0
 networkx==3.2.1
 pyyaml~=6.0
-matplotlib~=3.6.0
+matplotlib>=3.9.4
 plotly~=5.15.0
 tabulate~=0.8.7
 progressbar2==4.4.2