diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e54aa95..d324990 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -17,25 +17,21 @@ jobs:
       matrix:
         include:
           # Latest
-          - elixir: 1.19
+          - elixir: "1.20"
+            otp: 29
+          - elixir: "1.20"
             otp: 28
-          - elixir: 1.19
+          # 1.19
+          - elixir: "1.19"
+            otp: 28
+          - elixir: "1.19"
             otp: 27
           # 1.18
-          - elixir: 1.18
+          - elixir: "1.18"
             otp: 27
-          - elixir: 1.18
-            otp: 26
-          # 1.17
-          - elixir: 1.17
+          # Oldest supported (OTP 26 is EOL and no longer tested)
+          - elixir: "1.17"
             otp: 27
-          - elixir: 1.17
-            otp: 26
-          # Older supported
-          - elixir: 1.16
-            otp: 26
-          - elixir: 1.15
-            otp: 26
 
     steps:
       - uses: actions/checkout@v7
@@ -68,6 +64,6 @@ jobs:
       - uses: actions/checkout@v7
       - uses: erlef/setup-beam@v1
         with:
-          elixir-version: 1.19
-          otp-version: 28
+          elixir-version: "1.20"
+          otp-version: 29
       - run: mix format --check-formatted