diff --git a/recipes/fdb/5.19/meta/private/pyproject.toml b/recipes/fdb/5.19/meta/private/pyproject.toml
index dc42696..b4ce488 100644
--- a/recipes/fdb/5.19/meta/private/pyproject.toml
+++ b/recipes/fdb/5.19/meta/private/pyproject.toml
@@ -14,6 +14,11 @@ priority = "primary"
 name = "pypi"
 priority = "supplemental"
 
+[[tool.poetry.source]]
+name = "testpypi"
+url = "https://test.pypi.org/simple/"
+priority = "explicit"
+
 [tool.poetry.dependencies]
 python = "~3.11"
 pyfdb = "0.1.3"
@@ -36,12 +41,14 @@ earthkit-plots = "~1.0.0rc2"
 # MCH internal pypi (until officially published by DWD)
 eccodes-cosmo-resources-python-internal = {version = "^2.44.0.1", source = "pypi-mch"}
 
-eckit = "~2.0.6.17"
-eckitlib = "~2.0.6.17"
-mir-python = "~1.28.1.17"
-mirlib = "~1.28.1.17"
+# TestPyPI binary stack
+eckit = { version = "~2.0.8.dev76", source = "testpypi" }
+eckitlib = { version = "~2.0.8.dev76", source = "testpypi" }
+mir-python = { version = "~1.28.3.dev76", source = "testpypi" }
+mirlib = { version = "~1.28.3.dev76", source = "testpypi" }
 eccodes = "~2.44.0"
-eccodeslib =  "2.46.2.17"
+eccodeslib = { version = "~2.47.1.dev76", source = "testpypi" }
+atlaslib-ecmwf = { version = "0.46.1.dev76", source = "testpypi" }
 
 
 [tool.pytest.ini_options]