diff --git a/zilti/build-system/chicken.scm b/zilti/build-system/chicken.scm
index 87668db..72fa28d 100644
--- a/zilti/build-system/chicken.scm
+++ b/zilti/build-system/chicken.scm
@@ -95,7 +95,7 @@ EXTENSION is the file name extension, such as '.tar.gz'."
 
 (define* (chicken-build name inputs
                         #:key source
-                        (tests? #f)
+                        (tests? #t)
                         (parallel-build? #f)
                         (build-flags ''())
                         (configure-flags ''())
diff --git a/zilti/packages/chicken.scm b/zilti/packages/chicken.scm
index 2ee70b6..d4693ba 100644
--- a/zilti/packages/chicken.scm
+++ b/zilti/packages/chicken.scm
@@ -7989,13 +7989,13 @@ language standard, and includes many enhancements and extensions.")
   chicken-srfi-29
   (package
     (name "chicken-srfi-29")
-    (version "3.0.7")
+    (version "3.0.8")
     (source
       (origin
         (method url-fetch)
-        (uri (egg-uri "srfi-29" "3.0.7"))
+        (uri (egg-uri "srfi-29" "3.0.8"))
         (sha256
-          (base32 "15g2knq5b76f3nhxnmxidhkvbw9dyyc00hrzvsnpkmnfqzcmxbxw"))))
+          (base32 "1pz31xrfja4y43ci5n8gplhdnasbyxx0kwlmcjzycs1js4b66ld1"))))
     (propagated-inputs
       (specifications->packages
         (list "chicken-srfi-1"
@@ -8005,7 +8005,8 @@ language standard, and includes many enhancements and extensions.")
               "chicken-posix-utils"
               "chicken-condition-utils"
               "chicken-check-errors")))
-    (native-inputs (specifications->packages (list "chicken-test")))
+    (native-inputs
+      (specifications->packages (list "chicken-test" "chicken-test-utils")))
     (build-system chicken-build-system)
     (arguments '(#:egg-name "srfi-29"))
     (synopsis "Localization")
@@ -9783,7 +9784,15 @@ language standard, and includes many enhancements and extensions.")
         (uri (egg-uri "http-session" "2.10"))
         (sha256
           (base32 "1yjzkax2m3jz05640la0ry11vafrqwdhn2sd1jr0w8yhgbwwfprs"))))
-    (propagated-inputs (specifications->packages (list)))
+    (propagated-inputs
+      (specifications->packages
+        (list "chicken-intarweb"
+              "chicken-simple-sha1"
+              "chicken-spiffy"
+              "chicken-srfi-1"
+              "chicken-srfi-18"
+              "chicken-srfi-69"
+              "chicken-uri-common")))
     (native-inputs
       (specifications->packages
         (list "chicken-intarweb"
@@ -11463,15 +11472,16 @@ language standard, and includes many enhancements and extensions.")
   chicken-amb
   (package
     (name "chicken-amb")
-    (version "3.0.8")
+    (version "3.0.9")
     (source
       (origin
         (method url-fetch)
-        (uri (egg-uri "amb" "3.0.8"))
+        (uri (egg-uri "amb" "3.0.9"))
         (sha256
-          (base32 "1kkzmbym1xhgxby9grjamjs3yajz5l32v3wg2b6xsl7v0infkszs"))))
+          (base32 "0ggwmsd4igg099ikn5qja5nkqmrnsw0byyk3q9y04ygvzalqyb36"))))
     (propagated-inputs (specifications->packages (list "chicken-srfi-1")))
-    (native-inputs (specifications->packages (list "chicken-test")))
+    (native-inputs
+      (specifications->packages (list "chicken-test" "chicken-test-utils")))
     (build-system chicken-build-system)
     (arguments '(#:egg-name "amb"))
     (synopsis "The non-deterministic backtracking ambivalence operator")
diff --git a/zilti/packages/egg-generator.cscm b/zilti/packages/egg-generator.cscm
index 3a61092..a92634b 100644
--- a/zilti/packages/egg-generator.cscm
+++ b/zilti/packages/egg-generator.cscm
@@ -54,7 +54,9 @@
 
 (define egg-replacement-procs
   `(("fmt" . ,(lambda (egg)
-                (egg-version-set! egg "0.8.11")))))
+                (egg-version-set! egg "0.8.11")))
+    ("http-session" . ,(lambda (egg)
+                         (egg-dependencies-set! egg (egg-build-dependencies egg))))))
 
 (define (process-egg? eggrec)
   (alist-ref (egg-name eggrec) egg-blacklist