diff --git a/.github/workflows/UnitTests.yml b/.github/workflows/UnitTests.yml
index 9d5c078..08a242e 100644
--- a/.github/workflows/UnitTests.yml
+++ b/.github/workflows/UnitTests.yml
@@ -12,7 +12,7 @@ jobs:
       fail-fast: false
       matrix:
         julia-version:
-          - '1.0' # LTS
+          - '1.3' # The Indexes package uses the Artifacts framework, which is first available in Julia v1.3.
           - '1'
         julia-arch: [x64, x86]
         os: [ubuntu-latest, windows-latest, macOS-latest]
diff --git a/Project.toml b/Project.toml
index e13b090..82a7806 100644
--- a/Project.toml
+++ b/Project.toml
@@ -23,7 +23,7 @@ CodecBGZF = "0.1"
 GenomicFeatures = "2"
 Indexes = "0.2"
 TranscodingStreams = "0.6, 0.7, 0.8, 0.9"
-julia = "1"
+julia = "1.3"
 
 [extras]
 FormatSpecimens = "3372ea36-2a1a-11e9-3eb7-996970b6ffbd"