diff --git a/requirements_dev_base.txt b/requirements_dev_base.txt
index c955fe5d..e710656c 100644
--- a/requirements_dev_base.txt
+++ b/requirements_dev_base.txt
@@ -1,4 +1,4 @@
 # required
-cython
-numpy
-dask[array]
+cython==3.1.4
+numpy==2.3.3
+dask[array]==2025.9.1
diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index f72a5967..d33a958a 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==1.16.2
+matplotlib==3.10.6
+seaborn==0.13.2
+pandas==2.3.3
+scikit-learn==1.7.2
+h5py==3.14.0
+numexpr==2.13.1
+zarr==3.1.3
+hmmlearn==0.3.3
+protopunica==0.14.8.post2
+pyfasta==0.5.2
+ipython==9.6.0