diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d6282bd89..be7a00ccd 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php_version: ["7.3", "7.4", "8.0", "8.1"]
+        php_version: ["8.0", "8.1"]
         experimental: [false]
         include:
           - php_version: "8.2"
diff --git a/README.md b/README.md
index c57515421..bb0a64fd5 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ Skosmos is used as a basis for the [Finto](http://finto.fi) vocabulary service.
 The latest development version is also available at 
 [dev.finto.fi](http://dev.finto.fi).
 
-Skosmos is implemented using PHP (supported versions: 7.3, 7.4 and 8.0), with 
+Skosmos is implemented using PHP (supported versions: 8.0 and 8.1), with 
 Twig templates and e.g. jQuery and jsTree used to build the web interface, and 
 EasyRdf for SPARQL and RDF data access. 
 
diff --git a/composer.json b/composer.json
index 992dbaf9b..5bd708c9e 100644
--- a/composer.json
+++ b/composer.json
@@ -34,7 +34,7 @@
     "components/jquery": "3.6.*",
     "components/handlebars.js": "v4.7.7",
     "davidstutz/bootstrap-multiselect": "v1.1.1",
-    "sweetrdf/easyrdf": "1.7.*",
+    "sweetrdf/easyrdf": "1.13.*",
     "etdsolutions/waypoints": "4.0.0",
     "symfony/polyfill-php80": "1.*",
     "symfony/polyfill-php81": "1.*",