diff --git a/README.md b/README.md
index 79b9a9f..b931354 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@ Run it online by clicking on one of the badges below:
 
 ## Installed packages
 
-- **GMT**: 6.3.0
+- **GMT**: 6.4.0
 - **Julia**: 1.7
 - **GMT.jl**: 0.41.4
 - **Python**: 3.10
diff --git a/environment.yml b/environment.yml
index 02c2167..51efe55 100644
--- a/environment.yml
+++ b/environment.yml
@@ -4,7 +4,7 @@ channels:
   - defaults
 dependencies:
   - python=3.10
-  - gmt=6.3.0
+  - gmt=6.4.0
   - pygmt=0.6.1
   - jupyterlab=3.4.0
   - jupyter-offlinenotebook=0.2.2