diff --git a/.github/resources/conda-setup.yml b/.github/resources/conda-setup.yml
index 9ae4ca0..162c3d6 100644
--- a/.github/resources/conda-setup.yml
+++ b/.github/resources/conda-setup.yml
@@ -10,7 +10,7 @@ dependencies:
 #should be left out (and replaced with simple-build-system).
   - compilers
   - bash
-  - simple-build-system>=1.1.0
+  - simple-build-system>=1.2.6
   - ncrystal
   - mcpl
   - matplotlib
diff --git a/pyproject.toml b/pyproject.toml
index 2471a1e..179312f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -21,7 +21,7 @@ classifiers = [
     "Operating System :: Unix",
 ]
 dependencies = [
-    'simple-build-system >= 1.1.0'
+    'simple-build-system >= 1.2.6'
 ]
 
 [project.optional-dependencies]
diff --git a/resources/conda_dgcode.yml b/resources/conda_dgcode.yml
index dd96ce3..6ecd654 100644
--- a/resources/conda_dgcode.yml
+++ b/resources/conda_dgcode.yml
@@ -5,7 +5,7 @@ channels:
 dependencies:
   - compilers
   - bash
-  - simple-build-dgcode >= 1.2.1
+  - simple-build-dgcode >= 1.3.0
   - ncrystal
   - mcpl
   - matplotlib