diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 28113b4..2acdbae 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.13.16, 2.12.20, 3.3.6]
+        scala: [2.13.16, 2.12.21, 3.3.6]
         java: [temurin@8]
     runs-on: ${{ matrix.os }}
     steps:
@@ -98,12 +98,12 @@ jobs:
           tar xf targets.tar
           rm targets.tar
 
-      - name: Download target directories (2.12.20)
+      - name: Download target directories (2.12.21)
         uses: actions/download-artifact@v6
         with:
-          name: target-${{ matrix.os }}-2.12.20-${{ matrix.java }}
+          name: target-${{ matrix.os }}-2.12.21-${{ matrix.java }}
 
-      - name: Inflate target directories (2.12.20)
+      - name: Inflate target directories (2.12.21)
         run: |
           tar xf targets.tar
           rm targets.tar
diff --git a/build.sbt b/build.sbt
index d237182..d91274b 100644
--- a/build.sbt
+++ b/build.sbt
@@ -14,7 +14,7 @@ inThisBuild(
   )
 )
 
-val scala212Version = "2.12.20"
+val scala212Version = "2.12.21"
 val scala213Version = "2.13.16"
 val scala3Version = "3.3.6"
 val scalaVersions =