diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7a749051e8..96060b235f 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -44,7 +44,7 @@ jobs:
             buildType: RELEASE
             containerImage: ghcr.io/gafferhq/build/build:3.0.0
             options: .github/workflows/main/options.posix
-            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/8.0.1/gafferDependencies-8.0.1-linux-gcc11.tar.gz
+            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/9.1.0/gafferDependencies-9.1.0-linux-gcc11.tar.gz
             tests: testCore testCorePython testScene testImage testAlembic testUSD testVDB
             publish: true
             jobs: 4
@@ -54,25 +54,25 @@ jobs:
             buildType: DEBUG
             containerImage: ghcr.io/gafferhq/build/build:3.0.0
             options: .github/workflows/main/options.posix
-            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/8.0.1/gafferDependencies-8.0.1-linux-gcc11.tar.gz
+            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/9.1.0/gafferDependencies-9.1.0-linux-gcc11.tar.gz
             tests: testCore testCorePython testScene testImage testAlembic testUSD testVDB
             publish: false
             jobs: 4
 
           - name: windows
-            os: windows-2019
+            os: windows-2022
             buildType: RELEASE
             options: .github/workflows/main/options.windows
-            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/8.0.1/gafferDependencies-8.0.1-windows.zip
+            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/9.1.0/gafferDependencies-9.1.0-windows.zip
             tests: testCore testCorePython testScene testImage testAlembic testUSD testVDB
             publish: true
             jobs: 4
 
           - name: windows-debug
-            os: windows-2019
+            os: windows-2022
             buildType: RELWITHDEBINFO
             options: .github/workflows/main/options.windows
-            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/8.0.1/gafferDependencies-8.0.1-windows.zip
+            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/9.1.0/gafferDependencies-9.1.0-windows.zip
             tests: testCore testCorePython testScene testImage testAlembic testUSD testVDB
             publish: false
             jobs: 4
@@ -81,7 +81,7 @@ jobs:
             os: macos-14
             buildType: RELEASE
             options: .github/workflows/main/options.posix
-            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/9.0.0/gafferDependencies-9.0.0-macos-arm64.tar.gz
+            dependenciesURL: https://github.com/GafferHQ/dependencies/releases/download/9.1.0/gafferDependencies-9.1.0-macos-arm64.tar.gz
             tests: testCore testCorePython testScene testImage testAlembic testUSD testVDB
             publish: true
             jobs: 3
diff --git a/Changes b/Changes
index c5be5cd683..5c089356d2 100644
--- a/Changes
+++ b/Changes
@@ -30,6 +30,8 @@ Build
 - CI :
   - IECoreHoudini tests updated to pass on newer environments.
   - IECoreGL tests updated with relaxed precisions for image comparisons.
+  - Updated to GafferHQ/dependencies 9.0.0.
+  - Updated Windows build to use MSVC 2022.
 
 10.5.10.0 (relative to 10.5.9.5)
 =========
diff --git a/SConstruct b/SConstruct
index d6d2f637e8..63e8f7ad8d 100644
--- a/SConstruct
+++ b/SConstruct
@@ -985,7 +985,7 @@ o.Add(
 ###########################################################################################
 
 env = Environment(
-	MSVC_VERSION = "14.2",
+	MSVC_VERSION = "14.3",
 	options = o
 )