diff --git a/build.sh b/build.sh
index d7fddc254..ac18aab49 100755
--- a/build.sh
+++ b/build.sh
@@ -194,7 +194,7 @@ VERSION_WEBP=1.4.0          # https://chromium.googlesource.com/webm/libwebp
 VERSION_TIFF=4.7.0          # https://gitlab.com/libtiff/libtiff
 VERSION_RESVG=0.44.0        # https://github.com/linebender/resvg
 VERSION_AOM=3.10.0          # https://aomedia.googlesource.com/aom
-VERSION_HEIF=1.18.2         # https://github.com/strukturag/libheif
+VERSION_HEIF=1.19.1         # https://github.com/strukturag/libheif
 VERSION_VIPS=8.16.0         # https://github.com/libvips/libvips
 
 VERSION_EMSCRIPTEN="$(emcc -dumpversion)"
@@ -486,7 +486,7 @@ EOL
   # Compile with -D__EMSCRIPTEN_STANDALONE_WASM__ to disable the Embind implementation.
   emcmake cmake -B_build -H. -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=$TARGET $CMAKE_ARGS -DCMAKE_FIND_ROOT_PATH=$TARGET \
     -DBUILD_SHARED_LIBS=FALSE -DCMAKE_POSITION_INDEPENDENT_CODE=$PIC -DENABLE_PLUGIN_LOADING=FALSE \
-    -DBUILD_TESTING=FALSE -DWITH_EXAMPLES=FALSE -DWITH_LIBDE265=FALSE -DWITH_X265=FALSE \
+    -DBUILD_TESTING=FALSE -DWITH_EXAMPLES=FALSE -DWITH_LIBDE265=FALSE -DWITH_X265=FALSE -DWITH_OpenH264_DECODER=FALSE \
     -DCMAKE_CXX_FLAGS="$CXXFLAGS -D__EMSCRIPTEN_STANDALONE_WASM__" \
     -DENABLE_MULTITHREADING_SUPPORT=FALSE # Disable threading support, we rely on libvips' thread pool.
   make -C _build install
diff --git a/playground/package.json b/playground/package.json
index e2e3c22f9..fb960367f 100644
--- a/playground/package.json
+++ b/playground/package.json
@@ -24,12 +24,12 @@
     "copy-webpack-plugin": "^12.0.2",
     "css-loader": "^7.1.2",
     "fflate": "^0.8.2",
-    "html-webpack-plugin": "^5.6.2",
-    "mini-css-extract-plugin": "^2.9.1",
+    "html-webpack-plugin": "^5.6.3",
+    "mini-css-extract-plugin": "^2.9.2",
     "monaco-editor": "^0.52.0",
     "monaco-editor-webpack-plugin": "^7.1.0",
     "terser-webpack-plugin": "^5.3.10",
-    "webpack": "^5.95.0",
+    "webpack": "^5.96.1",
     "webpack-cli": "^5.1.4",
     "webpack-dev-server": "^5.1.0"
   }
diff --git a/test/unit/index.html b/test/unit/index.html
index e86236da3..9e24e36d1 100644
--- a/test/unit/index.html
+++ b/test/unit/index.html
@@ -5,7 +5,7 @@
   <title>wasm-vips testsuite</title>
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <!-- FIXME(kleisauke): https://github.com/cdnjs/tools/issues/285 -->
-  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/10.7.3/mocha.css" crossorigin="anonymous">
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/mocha/10.8.2/mocha.css" crossorigin="anonymous">
   <style>
     html,
     body {
@@ -96,7 +96,7 @@
 
   import * as Helpers from './helpers.js';
   // FIXME(kleisauke): https://github.com/cdnjs/packages/issues/1748
-  import { expect } from 'https://cdnjs.cloudflare.com/ajax/libs/chai/5.1.1/chai.js';
+  import { expect } from 'https://cdnjs.cloudflare.com/ajax/libs/chai/5.1.2/chai.js';
 
   // Global variables used throughout the unit tests
   globalThis.expect = expect;
diff --git a/test/unit/package.json b/test/unit/package.json
index b37f6c790..4d4494a3b 100644
--- a/test/unit/package.json
+++ b/test/unit/package.json
@@ -19,8 +19,8 @@
     "test": "mocha -s 5000 -t 120000 *.js -r node-helper.js"
   },
   "devDependencies": {
-    "chai": "^5.1.1",
-    "mocha": "^10.7.3"
+    "chai": "^5.1.2",
+    "mocha": "^10.8.2"
   },
   "engines": {
     "node": ">=16.4.0"