diff --git a/pyproject.toml b/pyproject.toml
index f73fb4b..8cd1a8f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -35,6 +35,7 @@ dependencies = [
   "numpy<2.0",
   "sciline>=24.06.0",
   "scipp>=23.8.0",
+  "scipy",
 ]
 
 dynamic = ["version"]
diff --git a/requirements/base.in b/requirements/base.in
index 4e0448f..b6c5a00 100644
--- a/requirements/base.in
+++ b/requirements/base.in
@@ -7,3 +7,4 @@ graphviz
 numpy<2.0
 sciline>=24.06.0
 scipp>=23.8.0
+scipy
diff --git a/requirements/base.txt b/requirements/base.txt
index 859e13d..b9450ed 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -1,4 +1,4 @@
-# SHA1:a2dbe72a013b7bd018e9754eea3fe61a710a8d98
+# SHA1:04e0512a74b1b519ad2df861b94ebe5af4e1d9dc
 #
 # This file is autogenerated by pip-compile-multi
 # To update, run:
@@ -27,6 +27,7 @@ numpy==1.26.4
     # via
     #   -r base.in
     #   scipp
+    #   scipy
 packaging==24.1
     # via dask
 partd==1.4.2
@@ -37,6 +38,8 @@ sciline==24.6.0
     # via -r base.in
 scipp==24.5.1
     # via -r base.in
+scipy==1.13.1
+    # via -r base.in
 toolz==0.12.1
     # via
     #   dask
diff --git a/requirements/docs.txt b/requirements/docs.txt
index 61e768e..bdd6de4 100644
--- a/requirements/docs.txt
+++ b/requirements/docs.txt
@@ -221,10 +221,6 @@ scippnexus==24.6.0
     #   essreduce
     #   esssans
     #   scippneutron
-scipy==1.13.1
-    # via
-    #   scippneutron
-    #   scippnexus
 six==1.16.0
     # via
     #   asttokens
diff --git a/requirements/nightly.in b/requirements/nightly.in
index cdbb532..6517acf 100644
--- a/requirements/nightly.in
+++ b/requirements/nightly.in
@@ -4,6 +4,7 @@
 dask
 graphviz
 numpy<2.0
+scipy
 https://github.com/scipp/scipp/releases/download/nightly/scipp-nightly-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
 sciline @ git+https://github.com/scipp/sciline@main
 scippnexus @ git+https://github.com/scipp/scippnexus@main
diff --git a/requirements/nightly.txt b/requirements/nightly.txt
index 3ab6fa5..c66da25 100644
--- a/requirements/nightly.txt
+++ b/requirements/nightly.txt
@@ -1,4 +1,4 @@
-# SHA1:4b34b702163219a465b8520722913b61f1b11575
+# SHA1:64aa6515409cee59ca0a6ab58de0da12d5b74e52
 #
 # This file is autogenerated by pip-compile-multi
 # To update, run:
@@ -47,7 +47,9 @@ scipp @ https://github.com/scipp/scipp/releases/download/nightly/scipp-nightly-c
 scippnexus @ git+https://github.com/scipp/scippnexus@main
     # via -r nightly.in
 scipy==1.13.1
-    # via scippnexus
+    # via
+    #   -r nightly.in
+    #   scippnexus
 six==1.16.0
     # via python-dateutil
 toolz==0.12.1