diff --git a/.ci_support/linux_64_.yaml b/.ci_support/linux_64_.yaml
index b1ecebb9..a516aa51 100644
--- a/.ci_support/linux_64_.yaml
+++ b/.ci_support/linux_64_.yaml
@@ -17,7 +17,7 @@ cxx_compiler_version:
 docker_image:
 - condaforge/linux-anvil-cos7-x86_64
 icu:
-- '75'
+- '78'
 nodejs:
 - '*'
 openssl:
diff --git a/.ci_support/linux_aarch64_.yaml b/.ci_support/linux_aarch64_.yaml
index 51eccdb7..5f2bbc54 100644
--- a/.ci_support/linux_aarch64_.yaml
+++ b/.ci_support/linux_aarch64_.yaml
@@ -17,7 +17,7 @@ cxx_compiler_version:
 docker_image:
 - quay.io/condaforge/linux-anvil-x86_64:alma9
 icu:
-- '75'
+- '78'
 nodejs:
 - '*'
 openssl:
diff --git a/.ci_support/migrations/brotli12.yaml b/.ci_support/migrations/brotli12.yaml
deleted file mode 100644
index bfc19e1e..00000000
--- a/.ci_support/migrations/brotli12.yaml
+++ /dev/null
@@ -1,14 +0,0 @@
-__migrator:
-  build_number: 1
-  commit_message: Rebuild for brotli 1.2
-  kind: version
-  migration_number: 1
-brotli:
-- '1.2'
-libbrotlicommon:
-- '1.2'
-libbrotlidec:
-- '1.2'
-libbrotlienc:
-- '1.2'
-migrator_ts: 1761598392.2337856
diff --git a/.ci_support/migrations/icu78.yaml b/.ci_support/migrations/icu78.yaml
new file mode 100644
index 00000000..16b84dc2
--- /dev/null
+++ b/.ci_support/migrations/icu78.yaml
@@ -0,0 +1,8 @@
+__migrator:
+  build_number: 1
+  commit_message: Rebuild for icu 78
+  kind: version
+  migration_number: 1
+icu:
+- '78'
+migrator_ts: 1766302854.3781085
diff --git a/.ci_support/osx_64_.yaml b/.ci_support/osx_64_.yaml
index 17adc1f4..88872e0a 100644
--- a/.ci_support/osx_64_.yaml
+++ b/.ci_support/osx_64_.yaml
@@ -19,7 +19,7 @@ cxx_compiler:
 cxx_compiler_version:
 - '19'
 icu:
-- '75'
+- '78'
 macos_machine:
 - x86_64-apple-darwin13.4.0
 nodejs:
diff --git a/.ci_support/osx_arm64_.yaml b/.ci_support/osx_arm64_.yaml
index c5ee2b2b..0289109c 100644
--- a/.ci_support/osx_arm64_.yaml
+++ b/.ci_support/osx_arm64_.yaml
@@ -19,7 +19,7 @@ cxx_compiler:
 cxx_compiler_version:
 - '19'
 icu:
-- '75'
+- '78'
 macos_machine:
 - arm64-apple-darwin20.0.0
 nodejs:
diff --git a/.scripts/run_osx_build.sh b/.scripts/run_osx_build.sh
index 361edeb2..bac7141a 100755
--- a/.scripts/run_osx_build.sh
+++ b/.scripts/run_osx_build.sh
@@ -63,6 +63,25 @@ if [[ "${sha:-}" == "" ]]; then
   sha=$(git rev-parse HEAD)
 fi
 
+if [[ "${OSX_SDK_DIR:-}" == "" ]]; then
+  if [[ "${CI:-}" == "" ]]; then
+    echo "Please set OSX_SDK_DIR to a directory where SDKs can be downloaded to. Aborting"
+    exit 1
+  else
+    export OSX_SDK_DIR=/opt/conda-sdks
+    /usr/bin/sudo mkdir -p "${OSX_SDK_DIR}"
+    /usr/bin/sudo chown "${USER}" "${OSX_SDK_DIR}"
+  fi
+else
+  if tmpf=$(mktemp -p "$OSX_SDK_DIR" tmp.XXXXXXXX 2>/dev/null); then
+      rm -f "$tmpf"
+      echo "OSX_SDK_DIR is writeable without sudo, continuing"
+  else
+      echo "User-provided OSX_SDK_DIR is not writeable for current user! Aborting"
+      exit 1
+  fi
+fi
+
 echo -e "\n\nRunning the build setup script."
 source run_conda_forge_build_setup
 
diff --git a/recipe/meta.yaml b/recipe/meta.yaml
index 108bf1c2..d45d57d2 100644
--- a/recipe/meta.yaml
+++ b/recipe/meta.yaml
@@ -22,7 +22,7 @@ source:
     - patches/0004-Forward-ceilf-floorf.patch  # [unix]
 
 build:
-  number: 0
+  number: 1
   # Prefix replacement breaks in the binary embedded configurations.
   detect_binary_files_with_prefix: false
   run_exports: