diff --git a/CHANGES.rst b/CHANGES.rst
index 03a06255..ffe4e94d 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -3,6 +3,10 @@ Changelog
 =========
 
 
+Kartothek 4.0.3 (2021-06-10)
+============================
+* Pin dask to not use 2021.5.1 and 2020.6.0 (#475)
+
 Kartothek 4.0.2 (2021-06-07)
 ============================
 
diff --git a/conda-requirements.txt b/conda-requirements.txt
index 8bcaa631..337f348a 100644
--- a/conda-requirements.txt
+++ b/conda-requirements.txt
@@ -1,4 +1,4 @@
-dask[dataframe]
+dask[dataframe]!=2021.5.1,!=2021.6.0  # gh475 - 2021.5.1 and 2021.6.0 broke ci, omit those versions
 decorator
 msgpack-python>=0.5.2
 # Currently dask and numpy==1.16.0 clash
diff --git a/conda-test-requirements.txt b/conda-test-requirements.txt
index 287675e9..c86034cb 100644
--- a/conda-test-requirements.txt
+++ b/conda-test-requirements.txt
@@ -1,5 +1,5 @@
 # Test Code Dependencies
-distributed
+distributed!=2021.5.1,!=2021.6.0 # gh475 - 2021.5.1 and 2021.6.0 broke ci, omit those versions
 pytz
 cloudpickle
 freezegun
diff --git a/requirements.txt b/requirements.txt
index b6d10a31..49d397fa 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,4 +1,4 @@
-dask[dataframe]
+dask[dataframe]!=2021.5.1,!=2021.6.0  # gh475 - 2021.5.1 and 2021.6.0 broke ci, omit those versions
 decorator
 msgpack>=0.5.2
 # Currently dask and numpy==1.16.0 clash
diff --git a/test-requirements.txt b/test-requirements.txt
index 189a5a05..eed44c8e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -1,5 +1,5 @@
 # Test Code Dependencies
-distributed
+distributed!=2021.5.1,!=2021.6.0 # gh475 - 2021.5.1 and 2021.6.0 broke ci, omit those versions
 pytz
 cloudpickle
 freezegun