diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b1a4bcedc8..ae0cef679f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -250,7 +250,7 @@ jobs:
                             PTEX_VERSION=v2.4.0
                             PUGIXML_VERSION=v1.12.1
                             USE_OPENVDB=0
-                            WEBP_VERSION=v1.2.1
+                            WEBP_VERSION=v1.2.4
                             # The installed OpenVDB has a TLS conflict with Python 3.8
           - desc: bleeding edge gcc12 C++20 py3.10 OCIO/libtiff/exr-master boost1.74 avx2
             nametag: linux-bleeding-edge
@@ -271,7 +271,7 @@ jobs:
                             PTEX_VERSION=main
                             PUGIXML_VERSION=master
                             USE_OPENVDB=0
-                            WEBP_VERSION=master
+                            WEBP_VERSION=main
                             OIIO_CMAKE_FLAGS="-DFORTIFY_SOURCE=2"
                             # The installed OpenVDB has a TLS conflict with Python 3.8
           - desc: clang14 C++20 avx2 exr3.1 ocio2.1
diff --git a/src/build-scripts/gh-installdeps.bash b/src/build-scripts/gh-installdeps.bash
index 032e22a517..3f0b397b42 100755
--- a/src/build-scripts/gh-installdeps.bash
+++ b/src/build-scripts/gh-installdeps.bash
@@ -80,9 +80,9 @@ else
     fi
 
     if [[ "$USE_LIBHEIF" != "0" ]] ; then
-       sudo add-apt-repository ppa:strukturag/libde265
-       sudo add-apt-repository ppa:strukturag/libheif
-       time sudo apt-get -q install -y libheif-dev
+       sudo add-apt-repository ppa:strukturag/libde265 || true
+       sudo add-apt-repository ppa:strukturag/libheif || true
+       time sudo apt-get -q install -y libheif-dev || true
     fi
 
     export CMAKE_PREFIX_PATH=/usr/lib/x86_64-linux-gnu:$CMAKE_PREFIX_PATH