diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index ba91dbc0beeb..de70935b83f2 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -85,7 +85,7 @@ jobs:
         python-version: ["3.7", "3.8", "3.9", "3.10", "3.11"]
       fail-fast: false
     env:
-      PYRIGHT_VERSION: 1.1.255 # Must match pyright_test.py.
+      PYRIGHT_VERSION: 1.1.266 # Must match pyright_test.py.
     steps:
       - uses: actions/checkout@v3
       - uses: jakebailey/pyright-action@v1
diff --git a/tests/pyright_test.py b/tests/pyright_test.py
index 7fe776361102..df818a5f19d3 100755
--- a/tests/pyright_test.py
+++ b/tests/pyright_test.py
@@ -5,7 +5,7 @@
 import sys
 from pathlib import Path
 
-_PYRIGHT_VERSION = "1.1.255"  # Must match .github/workflows/tests.yml.
+_PYRIGHT_VERSION = "1.1.266"  # Must match .github/workflows/tests.yml.
 _WELL_KNOWN_FILE = Path("tests", "pyright_test.py")