diff --git a/.snyk b/.snyk
new file mode 100644
index 0000000..989152f
--- /dev/null
+++ b/.snyk
@@ -0,0 +1,4 @@
+# Snyk (https://snyk.io) policy file, patches or ignores known vulnerabilities.
+version: v1.25.0
+language-settings:
+  python: "3.7"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ec2bfdd..6941fe6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ HyBIG follows semantic versioning. All notable changes to this project will be
 documented in this file. The format is based on [Keep a
 Changelog](http://keepachangelog.com/en/1.0.0/).
 
+## [unreleased] - 2024-06-06
+
+### Changed
+Updated internal library dependencies.
 
 ## [v1.2.0] - 2024-05-28
 
diff --git a/README.md b/README.md
index 97da4fa..1255e5d 100644
--- a/README.md
+++ b/README.md
@@ -197,7 +197,7 @@ environment via conda, and then install the necessary dependencies for the
 service within that environment via conda and pip then install the pre-commit hooks.
 
 ```
-> conda create -name hybig-env python==3.11
+> conda create --name hybig-env python==3.11
 > conda install --file conda_requirements.txt
 > pip install -r pip_requirements.txt
 > pip install -r dev-requirements.txt
diff --git a/conda_requirements.txt b/conda_requirements.txt
index 9263876..fc2f8ef 100644
--- a/conda_requirements.txt
+++ b/conda_requirements.txt
@@ -1 +1 @@
-gdal==3.6.3
+gdal==3.9
diff --git a/harmony_browse_image_generator/browse.py b/harmony_browse_image_generator/browse.py
index 39dedcd..a867a60 100644
--- a/harmony_browse_image_generator/browse.py
+++ b/harmony_browse_image_generator/browse.py
@@ -29,6 +29,7 @@
     TRANSPARENT,
     TRANSPARENT_IDX,
     TRANSPARENT_RGBA,
+    all_black_color_map,
     get_color_palette,
     remove_alpha,
 )
@@ -286,9 +287,9 @@ def get_color_map_from_image(image: Image) -> dict:
 
     """
     color_tuples = np.array(image.getpalette(rawmode='RGBA')).reshape(-1, 4)
-    color_map = {}
-    for idx in range(0, color_tuples.shape[0]):
-        color_map[idx] = tuple(color_tuples[idx])
+    color_map = all_black_color_map()
+    for idx, color_tuple in enumerate(color_tuples):
+        color_map[idx] = tuple(color_tuple)
     return color_map
 
 
diff --git a/harmony_browse_image_generator/color_utility.py b/harmony_browse_image_generator/color_utility.py
index 750a836..ce62d07 100644
--- a/harmony_browse_image_generator/color_utility.py
+++ b/harmony_browse_image_generator/color_utility.py
@@ -125,6 +125,11 @@ def get_remote_palette_from_source(source: HarmonySource) -> dict:
         raise HyBIGNoColorInformation('No color in source') from exc
 
 
+def all_black_color_map():
+    """Return a full length rgba color map with all black values."""
+    return {idx: (0, 0, 0, 255) for idx in range(256)}
+
+
 def convert_colormap_to_palette(colormap: dict) -> ColorPalette:
     """Convert a GeoTIFF palette to GDAL ColorPalette.
 
diff --git a/pip_requirements.txt b/pip_requirements.txt
index 0353a86..cbaf9cd 100644
--- a/pip_requirements.txt
+++ b/pip_requirements.txt
@@ -1,8 +1,8 @@
-harmony-service-lib~=1.0.26
+harmony-service-lib~=1.0.27
 pystac~=0.5.6
-matplotlib==3.7.1
-rasterio==1.3.6
-rioxarray==0.15.0
-numpy==1.24.2
-pillow==10.0.0
-pyproj==3.6.0
+matplotlib==3.9.0
+rasterio==1.3.10
+rioxarray==0.15.5
+numpy==1.26.4
+pillow==10.3.0
+pyproj==3.6.1
diff --git a/tests/unit/test_browse.py b/tests/unit/test_browse.py
index 52ad50f..9ea1293 100644
--- a/tests/unit/test_browse.py
+++ b/tests/unit/test_browse.py
@@ -631,11 +631,14 @@ def test_get_color_map_from_image(self):
         test_image.putpalette(palette_sequence, rawmode='RGBA')
 
         expected_color_map = {
-            0: (255, 0, 0, 255),
-            1: (0, 255, 0, 255),
-            2: (0, 0, 255, 255),
-            3: (225, 100, 25, 25),
-            4: (0, 0, 0, 0),
+            **{
+                0: (255, 0, 0, 255),
+                1: (0, 255, 0, 255),
+                2: (0, 0, 255, 255),
+                3: (225, 100, 25, 25),
+                4: (0, 0, 0, 0),
+            },
+            **{idx: (0, 0, 0, 255) for idx in range(5, 256)},
         }
 
         actual_color_map = get_color_map_from_image(test_image)