diff --git a/requirements_dev_base.txt b/requirements_dev_base.txt
index c955fe5d..557c6131 100644
--- a/requirements_dev_base.txt
+++ b/requirements_dev_base.txt
@@ -1,4 +1,4 @@
 # required
-cython
-numpy
-dask[array]
+cython==3.2.4
+numpy==2.4.2
+dask[array]==2026.1.2
diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index f72a5967..235203eb 100644
--- a/requirements_dev_optional.txt
+++ b/requirements_dev_optional.txt
@@ -1,13 +1,13 @@
 # optional
-scipy
-matplotlib
-seaborn
-pandas
-scikit-learn
-h5py
-numexpr
-zarr
-hmmlearn
-protopunica
-pyfasta
-ipython
+scipy==1.17.0
+matplotlib==3.10.8
+seaborn==0.13.2
+pandas==3.0.0
+scikit-learn==1.8.0
+h5py==3.15.1
+numexpr==2.14.1
+zarr==3.1.5
+hmmlearn==0.3.3
+protopunica==0.14.8.post2
+pyfasta==0.5.2
+ipython==9.9.0