diff --git a/build.gradle b/build.gradle
index 43d3040ee6..6317a82efd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -245,6 +245,8 @@ allprojects {
                     // force version for cloud, docker, fileTransfer, googledrive, tcrb, wnprc_ehr
                     force "org.apache.httpcomponents:httpcore:${httpcoreVersion}"
                     force "org.apache.httpcomponents.core5:httpcore5:${httpcore5Version}"
+                    // align httpcore5-h2 with httpcore5; the transitive 5.3.6 is exposed to CVE-2026-54399/CVE-2026-54428 (fixed in 5.4.3)
+                    force "org.apache.httpcomponents.core5:httpcore5-h2:${httpcore5Version}"
                     // force version for cloud, docker, fileTransfer, googledrive, tcrb, wnprc_ehr
                     force "org.apache.httpcomponents:httpclient:${httpclientVersion}"
                     force "org.apache.httpcomponents.client5:httpclient5:${httpclient5Version}"
diff --git a/dependencyCheckSuppression.xml b/dependencyCheckSuppression.xml
index 0fe1a5999d..83a4d7b1eb 100644
--- a/dependencyCheckSuppression.xml
+++ b/dependencyCheckSuppression.xml
@@ -327,5 +327,24 @@
         <packageUrl regex="true">^pkg:maven/org\.jetbrains\.kotlin/.*@.*$</packageUrl>
         <cve>CVE-2026-53914</cve>
     </suppress>
-
+    <!--
+    CVE-2026-54399 (httpcore5 HTTP/1.1 parser) and CVE-2026-54428 (httpcore5-h2 HTTP/2 HPACK decoder) are both scoped to Apache HttpComponents Core 5.x only. The classic httpcore 4.x line (org.apache.httpcomponents:httpcore) is EOL, has no HTTP/2 module, is not listed as affected, and has no fixed 4.4.x release. False positives for the 4.x artifact.    -->
+    <suppress>
+        <notes><![CDATA[
+    file name: httpcore-4.4.16.jar (classic 4.x, not affected by the 5.x-scoped CVEs)
+    ]]></notes>
+        <packageUrl regex="true">^pkg:maven/org\.apache\.httpcomponents/httpcore@.*$</packageUrl>
+        <cve>CVE-2026-54399</cve>
+        <cve>CVE-2026-54428</cve>
+    </suppress>
+    <!--
+    CVE-2026-53914 is an unsafe-deserialization flaw in Kotlin build-cache metadata (build tooling); JetBrains (the CNA) scores it 6.7 MEDIUM (AV:L/AC:H/PR:H), not NVD's auto-assigned 9.8, and the advisory names no runtime package. The shipped Kotlin runtime jars (kotlin-stdlib, kotlin-reflect, etc.) do not execute the affected code, and no stable fixed release exists yet (only 2.4.20-Beta1). False positive for the runtime artifacts.
+    -->
+    <suppress>
+        <notes><![CDATA[
+    Kotlin runtime jars (kotlin-stdlib, kotlin-reflect, kotlin-stdlib-jdk7/jdk8) - build-tooling CVE, not applicable to runtime.
+    ]]></notes>
+        <packageUrl regex="true">^pkg:maven/org\.jetbrains\.kotlin/.*@.*$</packageUrl>
+        <cve>CVE-2026-53914</cve>
+    </suppress>
 </suppressions>
diff --git a/gradle.properties b/gradle.properties
index 7b8fc29171..7e942bcd34 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -44,7 +44,7 @@ buildFromSource=true
 
 # The default version for LabKey artifacts that are built or that we depend on.
 # override in an individual module's gradle.properties file as necessary 
-labkeyVersion=26.3.16
+labkeyVersion=26.3.17
 labkeyClientApiVersion=7.2.0
 
 # Version numbers for the various binary artifacts that are included when
@@ -100,7 +100,7 @@ apacheDirectoryVersion=2.1.7
 apacheMinaVersion=2.2.7
 
 # Usually matches the version specified as a Spring Boot dependency (see springBootVersion below)
-apacheTomcatVersion=11.0.22
+apacheTomcatVersion=11.0.23
 
 # (mothership) -> json-path -> json-smart -> accessor-smart
 # (core) -> graalvm
@@ -186,7 +186,7 @@ hamcrestVersion=2.2
 htsjdkVersion=4.3.0
 
 httpclient5Version=5.5.2
-httpcore5Version=5.4
+httpcore5Version=5.4.3
 
 # Not used directly, but these are widely used transitive dependencies
 httpclientVersion=4.5.14
@@ -195,9 +195,9 @@ httpcoreVersion=4.4.16
 intellijKotlinVersion=2.3.10
 
 # Update the three Jackson dependency versions below in tandem, unless one gets a patch release out-of-sync with the others
-jacksonVersion=2.21.4
-jacksonDatabindVersion=2.21.4
-jacksonJaxrsBaseVersion=2.21.4
+jacksonVersion=2.21.5
+jacksonDatabindVersion=2.21.5
+jacksonJaxrsBaseVersion=2.21.5
 
 # Note the inconsistent version numbering for "annotations"... it no longer matches the above
 jacksonAnnotationsVersion=2.21
@@ -268,7 +268,7 @@ poiVersion=5.4.0
 
 pollingWatchVersion=0.2.0
 
-postgresqlDriverVersion=42.7.11
+postgresqlDriverVersion=42.7.12
 
 quartzVersion=2.5.2