diff --git a/CHANGELOG.md b/CHANGELOG.md
index caef2657e..acee9a8e1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,7 @@ All notable changes to this project will be documented in this file.
 - superset: Pin npm to `10.9.9` instead of installing the latest version with `nvm install --latest-npm` ([#1682]).
 - opa: update golang to 1.27.1 ([#1697]).
 - spark: Pin pyarrow below 26 to satisfy scikit-learn dependency on NumPy 1.x ([#1695]).
+- spark-connect-client: Replace hard-coded Python dependency versions with image dependencies and bump them for Spark 4.2.0 ([#1713]).
 
 ### Fixed
 
@@ -165,6 +166,7 @@ All notable changes to this project will be documented in this file.
 [#1709]: https://github.com/stackabletech/docker-images/pull/1709
 [#1710]: https://github.com/stackabletech/docker-images/pull/1710
 [#1712]: https://github.com/stackabletech/docker-images/pull/1712
+[#1713]: https://github.com/stackabletech/docker-images/pull/1713
 
 ## [26.7.0] - 2026-07-21
 
diff --git a/spark-connect-client/Dockerfile b/spark-connect-client/Dockerfile
index 86d093812..6655b1447 100644
--- a/spark-connect-client/Dockerfile
+++ b/spark-connect-client/Dockerfile
@@ -5,6 +5,10 @@ FROM local-image/spark-k8s AS spark-builder
 
 ARG PRODUCT_VERSION
 ARG PYTHON_VERSION
+ARG JUPYTERLAB_VERSION
+ARG SCIKIT_LEARN_VERSION
+ARG MATPLOTLIB_VERSION
+ARG PYARROW_MAX_VERSION
 ARG RELEASE_VERSION
 ARG STACKABLE_USER_UID
 
@@ -41,13 +45,11 @@ USER ${STACKABLE_USER_UID}
 # Packages are intentionally installed in "user mode" to reduce the container attack surface.
 # - pyspark[connect] = spark connect client libs
 # - jupyterlab = notebook client used in demos
-# - pyarrow < 26 = pyarrow 26 requires NumPy >= 2, but scikit-learn 1.3.1 requires
-#   NumPy 1.x. pyarrow does not declare NumPy as a dependency, thus pip cannot detect the conflict.
 RUN pip install --no-cache-dir --user \
   "pyspark[connect]==${PRODUCT_VERSION}" \
-  "pyarrow<26" \
-  "jupyterlab==4.4.1" \
-  "scikit-learn==1.3.1" \
-  "matplotlib==3.10.1"
+  "pyarrow<${PYARROW_MAX_VERSION}" \
+  "jupyterlab==${JUPYTERLAB_VERSION}" \
+  "scikit-learn==${SCIKIT_LEARN_VERSION}" \
+  "matplotlib==${MATPLOTLIB_VERSION}"
 
 WORKDIR /stackable
diff --git a/spark-connect-client/boil-config.toml b/spark-connect-client/boil-config.toml
index 3577b28d9..17b1c01f6 100644
--- a/spark-connect-client/boil-config.toml
+++ b/spark-connect-client/boil-config.toml
@@ -7,6 +7,10 @@ java-base = "21"
 
 [versions."4.1.2".build-arguments]
 python-version = "3.12"
+jupyterlab-version = "4.4.1"
+scikit-learn-version = "1.3.1"
+matplotlib-version = "3.10.1"
+pyarrow-max-version = "26"
 
 [versions."4.1.3".local-images]
 spark-k8s = "4.1.3"
@@ -14,10 +18,25 @@ java-base = "21"
 
 [versions."4.1.3".build-arguments]
 python-version = "3.12"
+jupyterlab-version = "4.4.1"
+scikit-learn-version = "1.3.1"
+matplotlib-version = "3.10.1"
+pyarrow-max-version = "26"
 
 [versions."4.2.0".local-images]
 spark-k8s = "4.2.0"
 java-base = "21"
 
+# Use this command to fetch the latest versions of these dependencies:
+#
+# printf 'pyspark[connect]==4.2.0\njupyterlab\nscikit-learn\nmatplotlib\npyarrow\n' \
+#   | uv pip compile - --python-version 3.14 --no-header --no-annotate \
+#   | grep -iE '^(pyspark|jupyterlab|scikit-learn|matplotlib|pyarrow|numpy|pandas)=='
+#
+# Change the pyspark[connect] version accordingly.
 [versions."4.2.0".build-arguments]
-python-version = "3.12"
+python-version = "3.14"
+jupyterlab-version = "4.6.4"
+scikit-learn-version = "1.9.1"
+matplotlib-version = "3.11.2"
+pyarrow-max-version = "27"