diff --git a/env.yml b/env.yml
index 55ff2114..d550959b 100644
--- a/env.yml
+++ b/env.yml
@@ -12,8 +12,8 @@ dependencies:
   - mkl-service=2.4.0
   # git-annex for templateflow users with DataLad superdatasets
   - git-annex=*=alldep*
-  # ANTs is linked against libitk 5.3 but does not pin the version
-  - libitk=5.3
+  # ANTs 2.5.3 is linked against libitk 5.4 - let's pin both there
+  - libitk=5.4
   # Base scientific python stack; required by FSL, so pinned here
   - numpy=1.26
   - scipy=1.11
@@ -28,7 +28,7 @@ dependencies:
   - graphviz=9.0
   - pandoc=3.1
   # Workflow dependencies: ANTs
-  - ants=2.5
+  - ants=2.5.3
   # Workflow dependencies: FSL (versions pinned in 6.0.7.7)
   - fsl-bet2=2111.4
   - fsl-flirt=2111.2