diff --git a/requirements_dev_base.txt b/requirements_dev_base.txt
index c955fe5d..254e7608 100644
--- a/requirements_dev_base.txt
+++ b/requirements_dev_base.txt
@@ -1,4 +1,4 @@
 # required
-cython
-numpy
-dask[array]
+cython==3.0.11
+numpy==2.1.0
+dask[array]==2024.8.2
diff --git a/requirements_dev_optional.txt b/requirements_dev_optional.txt
index f72a5967..6b794d80 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==1.14.1
+matplotlib==3.9.2
+seaborn==0.13.2
+pandas==2.2.2
+scikit-learn==1.5.1
+h5py==3.11.0
+numexpr==2.10.1
+zarr==2.18.2
+hmmlearn==0.3.2
+protopunica==0.14.8.post2
+pyfasta==0.5.2
+ipython==8.27.0