diff --git a/requirements/base.txt b/requirements/base.txt
index c1f7d55..06ef6fa 100644
--- a/requirements/base.txt
+++ b/requirements/base.txt
@@ -17,6 +17,8 @@ decorator==5.2.1
     # via ipython
 dill==0.3.5.1
     # via libpyvinyl
+exceptiongroup==1.3.1
+    # via ipython
 executing==2.2.0
     # via stack-data
 flexcache==0.3
@@ -29,10 +31,8 @@ h5py==3.13.0
     # via
     #   -r base.in
     #   libpyvinyl
-ipython==9.3.0
+ipython==8.37.0
     # via ipywidgets
-ipython-pygments-lexers==1.1.1
-    # via ipython
 ipywidgets==8.1.7
     # via mcstasscript
 jedi==0.19.2
@@ -51,7 +51,7 @@ matplotlib==3.10.3
     # via mcstasscript
 matplotlib-inline==0.1.7
     # via ipython
-mcstasscript==0.0.74
+mcstasscript==0.0.77
     # via -r base.in
 numpy==2.2.6
     # via
@@ -82,9 +82,7 @@ ptyprocess==0.7.0
 pure-eval==0.2.3
     # via stack-data
 pygments==2.19.1
-    # via
-    #   ipython
-    #   ipython-pygments-lexers
+    # via ipython
 pyparsing==3.2.3
     # via matplotlib
 python-dateutil==2.9.0.post0
@@ -107,6 +105,7 @@ traitlets==5.14.3
     #   matplotlib-inline
 typing-extensions==4.13.2
     # via
+    #   exceptiongroup
     #   flexcache
     #   flexparser
     #   ipython