diff --git a/bob/devtools/data/conda_build_config.yaml b/bob/devtools/data/conda_build_config.yaml
index d09e8a9512001f6bcd43e8dd8a016caf0a1c6038..e4bff6fc5461fd483efe60dd5752cf4fddd5fe10 100644
--- a/bob/devtools/data/conda_build_config.yaml
+++ b/bob/devtools/data/conda_build_config.yaml
@@ -95,46 +95,16 @@ make:
 pkg_config:
   - 0.29.2
 
-# The dependencies that we link against (host requirements).
-# Ideally we want to build against the oldest possible version of packages when
-# we are linking against them. It is best to keep this in sync with:
-# https://github.com/AnacondaRecipes/aggregate/blob/master/conda_build_config.yaml
-# The level of pins (x, x.x, or x.x.x) depends on the run_exports of the package
+# The host requirements. Ideally we want to build against the oldest possible version of
+# packages so packages can be installed with a wide range of versions. But the versions
+# here should also be compatible with the pinned versions in bob-devel. For most
+# dependencies, you want to put the exact version of bob-devel in here as well. It is
+# best to keep this in sync with:
+# https://github.com/AnacondaRecipes/aggregate/blob/master/conda_build_config.yaml The
+# names here should not contain dots or dashes. You should replace dots and dashes with
+# underlines.
 boost:
-  - 1.73
-ffmpeg:
-  - 4.2
-freetype:
-  - 2.10
-giflib:
-  - 5
-hdf5:
-  - 1.10.6
-jpeg:
-  - 9
-libblitz:
-  - 1.0.1
-libpng:
-  - 1.6
-libsvm:
-  - 3.24
-libtiff:
-  - 4.1
-mkl:
-  - 2019
-numpy:
-  - 1.16
-pybind11:
-  - 2.4
-sox:
-  - 14.4.2
-vlfeat:
-  - 0.9.21
-
-# The dependencies that are needed for runtime only (run requirements). These versions
-# **should** match the versions inside bob-devel recipe. In fact, you can copy the
-# bob-devel pins here and remove the ones that are already in the "build" requirements,
-# above (like numpy, boost). You should also replace dots and dashes with underlines.
+  - 1.73.0
 click:
   - 7.1.2
 click_plugins:
@@ -153,18 +123,40 @@ docker_py:
   - 4.3.1
 docopt:
   - 0.6.2
+ffmpeg:
+  - 4.2.2
+freetype:
+  - 2.10.4
+giflib:
+  - 5.2.1
 h5py:
   - 2.10.0
+hdf5:
+  - 1.10.6
 jinja2:
   - 2.11.2
+jpeg:
+  - 9b
 jsonschema:
   - 3.2.0
+libblitz:
+  - 1.0.1
+libpng:
+  - 1.6.37
+libsvm:
+  - 3.24
+libtiff:
+  - 4.1.0
 matplotlib:
   - 3.3.2
+mkl:
+  - 2019.4
 ncurses:
   - 6.2
 nose:
   - 1.3.7
+numpy: # we build against numpy 1.16 but test against newer versions.
+  - 1.16
 opencv:
   - 4.5.0
 pandas:
@@ -173,6 +165,8 @@ pillow:
   - 8.0.1
 psycopg2:
   - 2.8.5
+pybind11:
+  - 2.5.0
 pyopengl:
   - 3.1.1
 pyqtgraph:
@@ -208,7 +202,9 @@ setuptools:
 simplejson:
   - 3.17.2
 six:
-  - 1
+  - 1.15.0
+sox:
+  - 14.4.2
 sphinx:
   - 3.2.1
 sphinx_rtd_theme:
@@ -229,6 +225,8 @@ torchvision:
   - 0.8.1
 tqdm:
   - 4.50.2
+vlfeat:
+  - 0.9.21
 xarray:
   - 0.16.1
 zc_buildout: