diff --git a/.changeset/test-and-use-node-26.md b/.changeset/test-and-use-node-26.md
new file mode 100644
index 000000000..84b08f556
--- /dev/null
+++ b/.changeset/test-and-use-node-26.md
@@ -0,0 +1,5 @@
+---
+"braintrust": patch
+---
+
+misc: Test and use node 26
diff --git a/.github/workflows/checks.yaml b/.github/workflows/checks.yaml
index bc797f238..21b67c99e 100644
--- a/.github/workflows/checks.yaml
+++ b/.github/workflows/checks.yaml
@@ -88,7 +88,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, windows-2025-vs2026]
-        node-version: [20, 22, 24]
+        node-version: [20, 22, 24, 26]
     env:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: ${{ matrix.node-version == 20 && 'true' || '' }}
     steps:
@@ -364,7 +364,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [20, 22, 24]
+        node-version: [20, 22, 24, 26]
     env:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: ${{ matrix.node-version == 20 && 'true' || '' }}
     steps:
@@ -392,7 +392,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [20, 22, 24]
+        node-version: [20, 22, 24, 26]
     env:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: ${{ matrix.node-version == 20 && 'true' || '' }}
     steps:
@@ -420,7 +420,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: [20, 22, 24]
+        node-version: [20, 22, 24, 26]
         test-dir: [otel-v1, otel-v2]
     env:
       ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION: ${{ matrix.node-version == 20 && 'true' || '' }}
diff --git a/.tool-versions b/.tool-versions
index 11fbea60c..acea374cc 100644
--- a/.tool-versions
+++ b/.tool-versions
@@ -1,4 +1,4 @@
-nodejs 24.15.0
+nodejs 26.8.2
 npm 11.12.1
 pnpm 10.33.0
 deno 2.7.6
diff --git a/integrations/otel-js/Dockerfile.test b/integrations/otel-js/Dockerfile.test
index c0d4d81ba..84c76f791 100644
--- a/integrations/otel-js/Dockerfile.test
+++ b/integrations/otel-js/Dockerfile.test
@@ -19,9 +19,8 @@ RUN if [ -z "$NODE_VERSION" ] || [ "$NODE_VERSION" = "REQUIRED" ]; then echo "Er
 RUN if [ -z "$TEST_DIR" ]; then echo "Error: TEST_DIR build arg is required (e.g., --build-arg TEST_DIR=otel-v1)" && exit 1; fi
 RUN if [ "$TEST_DIR" != "otel-v1" ] && [ "$TEST_DIR" != "otel-v2" ]; then echo "Error: TEST_DIR must be either 'otel-v1' or 'otel-v2', got: '$TEST_DIR'" && exit 1; fi
 
-# Enable pnpm
-RUN corepack enable
-RUN corepack prepare pnpm@10 --activate
+# Install pnpm (Corepack is not included in Node.js 26 images)
+RUN npm install --global pnpm@10
 
 # Install build dependencies
 RUN apt-get update && apt-get upgrade -y && apt-get install -y \