diff --git a/CHANGELOG.md b/CHANGELOG.md
index e3cde082c..59a86cf78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Updated `duplicate_exact_syonym` [`report`] query to be case-insensitive and ignore synoyms annotated as abbreviation or acronym synonym types [#1179]
 - Extend `--drop-axiom-annotations` option to support value-specific removal of axiom annotations [#1193]
 - Add `--enforce-obo-format`, `--exclude-named-classes` and `--include-subclass-of` features to relax command [#1060, #1183]
+- Updated OWL API to 3.5.28. This includes a major update to OBO Format which now supports [IDSPACE declarations](https://github.com/owlcs/owlapi/pull/1102) (non-OBO Foundry prefixes).
 
 ### Fixed
 - '--annotate-with-source true' does not work with extract --method subset [#1160]
diff --git a/pom.xml b/pom.xml
index ecbf1494d..b12e2894e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -166,7 +166,7 @@
     <dependency>
       <groupId>net.sourceforge.owlapi</groupId>
       <artifactId>owlapi-api</artifactId>
-      <version>4.5.26</version>
+      <version>4.5.28</version>
       <exclusions>
         <exclusion>
           <groupId>com.google.code.findbugs</groupId>
@@ -177,7 +177,7 @@
     <dependency>
       <groupId>net.sourceforge.owlapi</groupId>
       <artifactId>owlapi-apibinding</artifactId>
-      <version>4.5.26</version>
+      <version>4.5.28</version>
       <exclusions>
         <exclusion>
           <groupId>com.google.code.findbugs</groupId>
@@ -188,7 +188,7 @@
     <dependency>
       <groupId>net.sourceforge.owlapi</groupId>
       <artifactId>owlapi-rio</artifactId>
-      <version>4.5.26</version>
+      <version>4.5.28</version>
       <exclusions>
         <exclusion>
           <groupId>com.google.code.findbugs</groupId>
@@ -204,12 +204,12 @@
     <dependency>
       <groupId>ch.qos.logback</groupId>
       <artifactId>logback-classic</artifactId>
-      <version>1.2.13</version>
+      <version>1.3.0</version>
     </dependency>
     <dependency>
       <groupId>org.slf4j</groupId>
       <artifactId>log4j-over-slf4j</artifactId>
-      <version>1.7.32</version>
+      <version>2.0.11</version>
     </dependency>
     <dependency>
       <groupId>au.csiro</groupId>
diff --git a/robot-core/pom.xml b/robot-core/pom.xml
index 9f94fa0b0..78b576794 100644
--- a/robot-core/pom.xml
+++ b/robot-core/pom.xml
@@ -86,7 +86,7 @@
     <dependency>
       <groupId>net.sourceforge.owlapi</groupId>
       <artifactId>owlapi-api</artifactId>
-      <version>4.5.26</version>
+      <version>4.5.28</version>
       <exclusions>
         <exclusion>
           <groupId>com.google.code.findbugs</groupId>
@@ -97,7 +97,7 @@
     <dependency>
       <groupId>net.sourceforge.owlapi</groupId>
       <artifactId>owlapi-apibinding</artifactId>
-      <version>4.5.26</version>
+      <version>4.5.28</version>
       <exclusions>
         <exclusion>
           <groupId>com.google.code.findbugs</groupId>
@@ -108,7 +108,7 @@
     <dependency>
       <groupId>net.sourceforge.owlapi</groupId>
       <artifactId>owlapi-rio</artifactId>
-      <version>4.5.26</version>
+      <version>4.5.28</version>
       <exclusions>
         <exclusion>
           <groupId>com.google.code.findbugs</groupId>