diff --git a/Gemfile b/Gemfile
index c003640842be..f9f8b335961f 100644
--- a/Gemfile
+++ b/Gemfile
@@ -159,6 +159,7 @@ gem "airbrake", "~> 13.0.0", require: false
 
 gem "md_to_pdf", git: "https://github.com/opf/md-to-pdf", ref: "8f14736a88ad0064d2a97be108fe7061ffbcee91"
 gem "prawn", "~> 2.4"
+gem "ttfunk", "~> 1.7.0" # remove after https://github.com/prawnpdf/prawn/issues/1346 resolved.
 # prawn implicitly depends on matrix gem no longer in ruby core with 3.1
 gem "matrix", "~> 0.4.2"
 
diff --git a/Gemfile.lock b/Gemfile.lock
index 5bf80bfa0a87..b2ada0ccae48 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -793,7 +793,7 @@ GEM
     parser (3.3.1.0)
       ast (~> 2.4.1)
       racc
-    pdf-core (0.10.0)
+    pdf-core (0.9.0)
     pdf-inspector (1.3.0)
       pdf-reader (>= 1.0, < 3.0.a)
     pdf-reader (2.12.0)
@@ -807,10 +807,9 @@ GEM
       activesupport (> 2.2.1)
       nokogiri (~> 1.10, >= 1.10.4)
       rubyzip (>= 1.2.0)
-    prawn (2.5.0)
-      matrix (~> 0.4)
-      pdf-core (~> 0.10.0)
-      ttfunk (~> 1.8)
+    prawn (2.4.0)
+      pdf-core (~> 0.9.0)
+      ttfunk (~> 1.7)
     prawn-table (0.2.2)
       prawn (>= 1.3.0, < 3.0.0)
     pry (0.14.2)
@@ -1088,8 +1087,7 @@ GEM
       openssl (> 2.0)
       openssl-signature_algorithm (~> 1.0)
     trailblazer-option (0.1.2)
-    ttfunk (1.8.0)
-      bigdecimal (~> 3.1)
+    ttfunk (1.7.0)
     turbo-rails (2.0.5)
       actionpack (>= 6.0.0)
       activejob (>= 6.0.0)
@@ -1344,6 +1342,7 @@ DEPENDENCIES
   table_print (~> 1.5.6)
   test-prof (~> 1.3.0)
   timecop (~> 0.9.0)
+  ttfunk (~> 1.7.0)
   turbo-rails (~> 2.0.0)
   turbo_tests!
   typed_dag (~> 2.0.2)