diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e174d818c..3c29b57d9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -23,7 +23,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        scala: [2.12.17, 2.13.8, 3.1.2]
+        scala: [2.12.16, 2.13.8, 3.1.2]
         java: [adopt-hotspot@8]
     runs-on: ${{ matrix.os }}
     steps:
@@ -55,7 +55,7 @@ jobs:
         run: sbt ++${{ matrix.scala }} githubWorkflowCheck
 
       - name: Build project (Scala 2)
-        if: matrix.scala == '2.12.17' || matrix.scala == '2.13.8'
+        if: matrix.scala == '2.12.16' || matrix.scala == '2.13.8'
         run: sbt ++${{ matrix.scala }} validateJVM validateJS validateNative
 
       - name: Build project (Scala 3)
@@ -109,12 +109,12 @@ jobs:
             ~/Library/Caches/Coursier/v1
           key: ${{ runner.os }}-sbt-cache-v2-${{ hashFiles('**/*.sbt') }}-${{ hashFiles('project/build.properties') }}
 
-      - name: Download target directories (2.12.17)
+      - name: Download target directories (2.12.16)
         uses: actions/download-artifact@v2
         with:
-          name: target-${{ matrix.os }}-2.12.17-${{ matrix.java }}
+          name: target-${{ matrix.os }}-2.12.16-${{ matrix.java }}
 
-      - name: Inflate target directories (2.12.17)
+      - name: Inflate target directories (2.12.16)
         run: |
           tar xf targets.tar
           rm targets.tar
diff --git a/build.sbt b/build.sbt
index ef16cc2b4..e11157821 100644
--- a/build.sbt
+++ b/build.sbt
@@ -11,7 +11,7 @@ val gitHubOwner = "fthomas"
 val gitPubUrl = s"https://github.com/$gitHubOwner/$projectName.git"
 val gitDevUrl = s"git@github.com:$gitHubOwner/$projectName.git"
 
-val Scala_2_12 = "2.12.17"
+val Scala_2_12 = "2.12.16"
 val Scala_2_13 = "2.13.8"
 val Scala_3 = "3.1.2"