diff --git a/.github/workflows/coverage-windows.yml b/.github/workflows/coverage-windows.yml
index d0236cd7d609..6dd0874cea95 100644
--- a/.github/workflows/coverage-windows.yml
+++ b/.github/workflows/coverage-windows.yml
@@ -62,7 +62,7 @@ concurrency:
 env:
   PYTHON_VERSION: '3.14'
   FLAKY_TESTS: keep_retrying
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read
diff --git a/.github/workflows/stress-test.yml b/.github/workflows/stress-test.yml
index 6f1e75813915..c4bc803078b1 100644
--- a/.github/workflows/stress-test.yml
+++ b/.github/workflows/stress-test.yml
@@ -36,7 +36,7 @@ env:
   PYTHON_VERSION: '3.14'
   XCODE_VERSION: '16.4'
   CLANG_VERSION: '19'
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read
diff --git a/.github/workflows/test-linux-quic.yml b/.github/workflows/test-linux-quic.yml
index e1a05cf91859..242a4c145129 100644
--- a/.github/workflows/test-linux-quic.yml
+++ b/.github/workflows/test-linux-quic.yml
@@ -37,7 +37,7 @@ env:
   CXX: ${{ (github.base_ref == 'main' || github.ref_name == 'main') && 'sccache' || '' }} clang++-19
   SCCACHE_GHA_ENABLED: ${{ github.base_ref == 'main' || github.ref_name == 'main' }}
   SCCACHE_IDLE_TIMEOUT: '0'
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read
diff --git a/.github/workflows/test-linux.yml b/.github/workflows/test-linux.yml
index 7681a176139d..95b55252b22f 100644
--- a/.github/workflows/test-linux.yml
+++ b/.github/workflows/test-linux.yml
@@ -46,7 +46,7 @@ env:
   CXX: ${{ (github.base_ref == 'main' || github.ref_name == 'main') && 'sccache' || '' }} clang++-19
   SCCACHE_GHA_ENABLED: ${{ github.base_ref == 'main' || github.ref_name == 'main' }}
   SCCACHE_IDLE_TIMEOUT: '0'
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read
diff --git a/.github/workflows/test-macos.yml b/.github/workflows/test-macos.yml
index c53bcde2851c..ad20daa142c2 100644
--- a/.github/workflows/test-macos.yml
+++ b/.github/workflows/test-macos.yml
@@ -68,7 +68,7 @@ env:
   PYTHON_VERSION: '3.14'
   XCODE_VERSION: '16.4'
   FLAKY_TESTS: keep_retrying
-  RUSTC_VERSION: '1.86'
+  RUSTC_VERSION: '1.88'
 
 permissions:
   contents: read